JPH0863205A - Programmable controller - Google Patents

Abstract

(57) [Summary] [Configuration] In a programmable controller that executes an SFC program, block execution means that controls and executes the entire block of the program, and an active step information storage table that stores the step number of the active step of the active block, When the step NO stored in the activation step information storage table is examined and a step execution means for executing the operation output thereof, a transition execution means for executing a transition condition to the activation step, and a transition established by the transition execution means are established, If the step attribute is checked, and if it is a transition holding step, the execution step is not deleted and the execution step is continued to be executed after the transition to the next step, and the transition destination step is activated one after another when the subsequent transition is established. It is provided with an execution means. [Effect] When the SFC program is executed, a plurality of steps connected in series can be simultaneously executed, and follow-up control of the steps can be enabled.

Description

Detailed Description of the Invention

[0001]

This invention relates to SFC based on SFC language.
The present invention relates to a programmable controller that executes an FC program.

[0002]

2. Description of the Related Art Recently, a method of loading and executing a program (hereinafter, referred to as SFC program) created in SFC language by a peripheral device as a program creating means to a programmable controller (hereinafter, referred to as PC) has been put into practical use. Has been done. FIG. 12A is a block diagram showing the configuration of a conventional PC. In the figure, 1 is a CPU that executes an SFC program, 2 is an input / output interface that exchanges data with a control target (not shown) and peripheral devices (not shown), and 3 is a microprogram as an OS that controls the CPU 1. Microprogram RO to store
M and 4 are RAMs for storing pressure control step information indicating active step information at the time of executing the SFC program, 5 is RAM for storing the program, and 6 is a common bus connecting 1 to 5. Further, 31 to 33 show the contents of the microprogram ROM 3, 31 is a block executing means for controlling and executing the entire block (a block will be described in detail later), and 32 is a step for detecting an active step of the block. And 33 is a shift executing means for executing a shift process associated with the active step. Further, 41 to 42 show the contents of the RAM 4 for storing active step information, 42 is an active step information storage table for storing the active step NO of each block, and 41 is an active step information table 42 for each block. It is a pointer table that stores pointers.

FIG. 13 shows an example of the SFC program. The SFC program expresses the flow of control in a flow format, and is composed of a combination of "steps" indicating a certain operation and "shifts" indicating the transition conditions for executing the above steps. The "step" and "transition" have a control program "operation output" and "transition condition", respectively, and are executed during activation. The step being executed is called an active step, and when the transition condition for the transition accompanying it is satisfied, the step becomes inactive, the execution is terminated, and the execution is moved to the next step. In FIG. 13, 11 indicates a “step” and 12 indicates a “shift”. A group of a series of steps is expressed as a “block”, the first step of the block is called an initial step, and the last step is called an end step. A block is activated by an activation request from another block and executes from the initial step to the end step and ends. This block can be activated multiple times, and the activated blocks are processed in parallel. The block activation request is made by executing the block activation step. The block activation step is activated during execution of the activation destination block and deactivated at the end of the activation destination block, and the execution proceeds to the next subsequent step. FIG.
In 3, 3, 10 is an initial step, 15 is an end step, 13 is a block activation step, and 16 is a “block”.

FIG. 14 shows that the PC executes an SFC program loaded on the PC from a peripheral device (not shown).
It is a flowchart which performs the activation step of each block. Reference numeral 200 indicates active block execution preparation, 201 indicates a block stop request check, and 202 indicates a branch process with or without a block stop request. Reference numeral 203 indicates preparation for execution of active step of the active block, reference numeral 204 indicates reading of active step NO, and reference numeral 205 indicates execution of read active step. Reference numeral 206 indicates the execution of the transition process associated with the active step. Further, 207 indicates a branch process based on the execution result of the migration process, 208 indicates a change process of the execution step NO when the transition is established, and 209 indicates a continuation process of the execution step NO when the transition is not established. Reference numeral 210 denotes an active block execution completion check for active blocks, and 211 denotes an active block execution completion check for active blocks.

Next, the operation will be described. In the SFC program shown in FIG. 13, step 1 of block 2
The operation when (S1) is active will be described based on the flowchart shown in FIG. In step 200, it is detected that block 2 is active, and execution of block 2 is started. In step 201, it is detected whether or not there is a stop request in block 2, and if there is a request in branch step 202, block 2 is not executed and the process moves to the next active block, but if there is no request, the execution process of that block is executed. Move. Step 20
3 detects the number of active steps of active block 2,
(A) Active step information storage table 42 of active blocks stored in RAM 4 for active step information storage
In step 204, the activation step NO1 is read out based on the information described in (1). In step 205, the operation output program of the activation step NO is executed. Then, in step 206, the transition process associated with the active step is executed in the same manner as the active step. Then, branch step 207
If the execution result of the migration process is migration successful, in step 208, deletion of the execution step NO and registration of the migration destination step NO are executed in the active step information storage table 42 of the active block, and migration is not successful. If there is, the continuous registration of the execution step NO is executed in step 209. Here, when the transition is established, the end processing of the execution step is always executed in step 208 to activate the transition destination step.
The execution steps are not continuously executed, and a plurality of steps connected in series are never activated and executed at the same time. In step 210, it is checked whether all active steps of the block have been executed, and in step 211 it is checked whether all active blocks have been executed. If they have been executed, the processing is completed.

[0006]

Since the conventional PC is configured as described above, in step execution of the SFC program, a plurality of steps connected in series are not activated and executed at the same time. Although it does not matter if the operation of one machine is controlled when executing the step step control which is supposed to be suitable for the SFC program, the control of a plurality of machines is divided into each step of SFC and controlled. In this case, there is a problem that the machine that has been once completed cannot be executed until the control of a series of steps is completed. In addition, in the stop control of each block, all the active steps are forcibly stopped in the scan for which a stop request is issued, so the execution state at the time of stop differs for each step, and when stopping in a halfway state, There was a problem that it was necessary to separately program the control at the time of stop corresponding to the execution state.

The present invention has been made to solve the above-mentioned problems, and when executing an SFC program, a transition holding step that allows a plurality of steps connected in series to be activated at the same time, and , It is possible to stop each active step of the active block by waiting until the transition condition which is the execution end condition of each active step is satisfied, instead of immediately stopping all active steps of the block when the block is stopped. This is a problem that occurs when a plurality of steps connected in series can be activated at the same time and a follow-up operation of a step is enabled, and when a transition destination step is already active,
Setting of operation mode at step transition that can be selected whether to stop due to an error, to transition after the transition destination step transitions and becomes inactive, or to transition without waiting for the transition destination step to transition The purpose is to enable.

[0008]

A programmable controller according to the present invention stores, in a programmable controller that executes an SFC program, block execution means that controls and executes the entire block of the program and step NO of the active step of the active block. Active step information storage table, step NO stored in the active step information storage table, and step output means for executing its operation output, transition execution means for executing transition conditions to the active step, and When the transition is established by the transition executing means, the step attribute is checked, and if it is the transition holding step, the execution step is continued to be executed after the transition to the next step without deleting the execution step,
It is provided with a transition holding step executing means for activating the transition destination steps one after another when the subsequent transitions are established.

Further, the programmable controller according to the present invention is, in a programmable controller for executing an SFC program, a block executing means for controlling and executing an entire block of a program, a step NO of an active step of an active block and a status corresponding thereto. Active step information storage table, step execution means for checking the step NO stored in the active step information storage table and executing its operation output, and transition execution means for executing transition conditions to the active step. ,
The step stop request is checked according to the step status of the corresponding step in the active step information storage table. If there is a stop request, the process of the corresponding step is not executed. If there is no stop request, the process of the corresponding step is executed. Management means, a block stop mode execution means for selecting whether to immediately stop all active steps or stop each active step upon completion of transition when the block is stopped by the block execution means, and the transition execution means If the mode selected by the block stop mode execution means is the stop mode after transition when the transition is established by, the step status of the corresponding step checked by the step execution management means is set to be the stop state after transition, and from the next time Stop the active step without executing it. Those having a stop step stops execution means after the migration.

In the block stop mode executing means,
It is preferable to include block stop mode setting means for specifying the stop mode setting for each block.

Further, it is more preferable that the block stop mode executing means is provided with an active step corresponding block stop mode setting means for designating a stop mode setting for each block and corresponding to an active step NO.

It should be noted that if a plurality of steps connected in series are simultaneously executed by the transition holding step execution means, and the previous step which the transition execution means has tried to transition to when the transition is established is already active, an error occurs. It is preferable to include an operation mode executing means at the time of step transition for selecting whether to perform the transition destination step transition, and wait for the transition destination step to become inactive, or to transition without waiting for the transition destination step transition. .

Further, it is preferable that the step transition operation mode execution means includes step transition operation mode setting means for designating an operation mode setting for each block.

[0014]

According to the programmable controller of the present invention, the step executing means has the RA for storing active step information.
The activation step NO is acquired from M and its operation output is executed. Further, the transition executing means executes the transition condition of the transition accompanying the step, and if it is the transition holding step, the transition holding step executing means does not delete the execution step when the transition is established and executes the execution step after the transition. The transfer destination step can be started one after another when the transfer is established.

Further, according to the programmable controller of the present invention, the block stop mode executing means, in the block executing means, immediately sets all the active steps at the time of the preset block stop, or shifts the active steps. In the former case, execution of the block is immediately stopped, and in the latter case, execution is stopped after the transition of all active steps of the block, according to the designation of the block stop mode to be stopped. Also, the post-migration stop step stop executing means registers step NO in the active step information storage table and activates the step status so as to activate the migration destination step when the transition is established in the block migration after stop mode. It is set so that it is in the post-stop state, and thereafter, the step execution management means of the step execution means detects the step status and does not execute the corresponding step, so that the step that has been transitioned is brought into the stop state.

Further, according to the programmable controller of the present invention, the block stop mode setting means enables the stop mode setting to be specified for each block in the specification of the block stop mode referred to by the block stop mode executing means. .

Further, according to the programmable controller of the present invention, the active step corresponding block stop mode setting means can specify the stop mode setting for each block in the block stop mode specification referred to by the block stop mode executing means. In addition, the stop mode can be designated corresponding to the activation step NO.

Further, according to the programmable controller of the present invention, whether the step transition operation mode executing means gives a preset error when the previous step to be transitioned due to the establishment of transition is already active, According to the designation of whether to migrate after waiting for the migration destination step to migrate and become inactive, or to migrate without waiting for the migration destination step to migrate, stop if there is an error, and wait for migration The migration process of the execution step is executed again without being executed.

According to the programmable controller of the present invention, the step transition operation mode setting means allows the step transition operation mode execution means to specify the operation mode setting for each block.

[0020]

【Example】

Example 1. An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing the structure of the PC of FIG.
4 is a detailed diagram of a RAM for storing active step information of FIG. The other blocks are the same as those in FIG. FIG. 2 shows an example of the SFC program and an example of the controlled object. FIG. 3 is a flowchart showing a flow of executing a SFC program loaded on a PC from a peripheral device (not shown) while simultaneously enabling a plurality of steps in series and executing a transition holding step. In FIG.
The same numbers as in (B) and (C) indicate the same,
Reference numeral 36 is a transition holding step executing means. In FIG. 2, the same numbers as those in FIG. 13 indicate the same items.
Is a transition holding step, and 20 is a control target example using the transition holding step 17. In FIG. 3, the same numbers as those in FIG. 14 indicate the same items, but 212 is a step attribute check process and 213 is a branch process according to the result. Further, reference numeral 214 is a continuous registration of the execution step NO and a registration processing of the transfer destination step NO which are executed when the transition holding step 17 is performed.

Next, the operation will be described. S shown in FIG.
In the FC program example, reference numeral 17 indicates a transition holding step, and by creating the transition holding step 17, the transition holding can be designated to be executed. In the flowchart shown in FIG. 3, the block executing means 31 shown in FIG.
In step 200, the number of active blocks is read, and the processing for the number of active blocks is repeated. In step 201, it is checked whether there is a block stop request, and step 2
If there is a request in 02, the processing of the corresponding block is not executed, and if not, it is executed. Next, the step executing means 32 of FIG. 1 reads the number of active steps of the active block processed in step 203, and repeats the processing for the number of active steps. Next, in step 204, the activation step NO is read out, and is executed in step 205. In step 206, the migration process associated with the active step is executed, and step 207
Then, the execution result is checked, and if the transition is not established, the continuous registration of NO executed in step 209 is executed. If the transition is established, the step attribute is checked in step 212, and if it is not the transition holding step in step 213,
In step 208, the execution step NO is deleted and the transfer destination step NO is registered in the active step information storage table 42 of FIG.
In step 214, continuous registration of execution step NO and registration of transfer destination step NO are carried out. As a result, the execution step can be executed even in the next scan.

The above operation will be described based on the transition holding step 17 created in the block 2 of the SFC program example shown in FIG. 2 and the control target example thereof. The initial step 10 of the block 2 is designated as the transition holding step 17. By doing so, it is possible to continue executing the initial step 10 even after the transition is established, so that the control of the machine 1 in step 1 (S1) is completed, and the carriage on which the work is placed is the machine 2 in step 2 (S2). After shifting to the control, the machine 1 in step 1 (S1) is in a waiting state for the next work, but in response to this, step 0 (S0) is the shift holding step 17, so the initial step 10 is executed and the shift condition is changed. If is satisfied, it is possible to move the carrier on which the next work is placed to the machine 1 in step 1 (S1). As a result, the machine 1 in step 1 (S1) controls the next work in parallel without waiting for the first work to complete the control of the machine 3 in step 3 (S3) and the completion of block 2. It is possible to increase the operating rate of each machine.

Example 2. Further in FIG.
The same numbers as in (B) and (C) indicate the same,
Reference numeral 34 is a block stop mode execution means, 35 is a step execution management means, and 37 is a post-migration stop step stop execution means. Further, 43 is a step status corresponding to the active step No. stored in the active step information storage table. In FIG. 4, the same numbers as those in FIG. 14 indicate the same items, but 215 is a block stop mode check process and 216 is a branch process according to the result.
217 is a step stop request check process, and 2
Reference numeral 18 is a branch process according to the result. Further, reference numeral 219 denotes a post-transition stop state setting process to the step status which is executed when the block stop mode is the post-transition stop mode when the transition is established.

Next, the operation will be described. In the flowchart shown in FIG. 4, step 200 to step 2
The process up to 11 is the same as that in the first embodiment, but the step 2
When there is a block stop request in 02, the block stop mode execution means 34 of FIG. 1 checks the block stop mode in step 215. If it is an immediate stop in step 216, the process of the corresponding block is not executed, and if it is a stop after transition, the block Is performed. Next, at step 204, after reading the active step NO, the step execution management means 35 of FIG.
Accordingly, in step 217, the step stop request is checked by the step status 43 of the corresponding step in the active step information storage table 42. If the stop request is issued in step 218, the process of the corresponding step is not executed, and if not, it is executed. After the execution of the transition process, if the block stop mode is the post-transition stop mode when the transition is established, the step status of the post-transition stop step stop execution means 37 of FIG. Set to. As a result, it is possible to stop only the step in which the transition is established from the next scan.

Example 3. Further, FIG. 5 is a block stop mode setting screen for setting the block stop mode of each block in the block stop mode execution means 34 of FIG. 1 in a peripheral device (not shown). Reference numeral 70 denotes a screen for selecting the block stop mode setting on the auxiliary function menu screen. Also, 71 is a screen for selecting the block correspondence setting and the step correspondence setting on the block stop mode setting menu screen, and 72 is a screen for setting the block stop mode for the block NO correspondence when the block correspondence setting is selected at 71. is there. FIG. 6 is a flowchart showing a flow of a setting operation procedure on a screen for setting block correspondence in the block stop mode in a peripheral device (not shown).

Next, the operation will be described. When the function key (F4) is selected in step 100 on the SFC operation screen of the peripheral device shown in FIG. 5, the auxiliary function menu screen 70 is displayed. When the block stop mode setting is selected in step 101, the block stop mode setting menu screen 71 is displayed. Next, when the block correspondence setting is selected in step 102, the corresponding setting screen 72 is displayed, and the setting is executed in step 103. When the function key (F4) is selected in step 104 on the corresponding setting screen 72, the execution of setting is completed,
As a result, the block stop mode setting data for each block is created as a parameter. The peripheral device writes the above parameters in the CPU 1 of FIG.
When executing the SFC program, the CPU 1 can detect a block stop mode for each block based on the setting data and execute a corresponding stop operation.

Example 4. Further, FIG. 7 is a block stop mode setting screen for setting the block stop mode of each block in the block stop mode execution means 34 of FIG. 1 in a peripheral device (not shown). In FIG.
The same numbers as in FIG. 5 indicate the same items, but 73 is 71.
It is a screen for setting the block stop mode in response to the step NO of the block when the block corresponding setting is selected in. FIG. 8 is a flowchart showing a flow of a setting operation procedure on a screen for performing step correspondence setting in the block stop mode in a peripheral device (not shown).

Next, the operation will be described. When the function key (F4) is selected in step 100 on the SFC operation screen of the peripheral device shown in FIG. 7, the auxiliary function menu screen 70 is displayed. When the block stop mode setting is selected in step 101, the block stop mode setting menu screen 71 is displayed. Next, when the step correspondence setting is selected in step 105, the corresponding setting screen 73 is displayed, the setting is executed in step 106, and the range of steps corresponding to each stop mode is designated. When the function key (F4) is selected in step 104 on the corresponding setting screen 73, the execution of the setting is completed,
As a result, the block stop mode setting data for each block is created as a parameter. When the peripheral device writes the above parameters into the CPU1, the CPU1
When executing the SFC program, the block stop mode for each block based on the setting data can be detected, and the stop operation corresponding to the step that is active when the block is stopped can be executed.

Embodiment 5 FIG. Further, in FIG.
The same numbers as in (B) and (C) indicate the same,
Numeral 38 is an operation mode executing means at step transition. Figure 9
In FIG. 14, those having the same numbers as in FIG. 14 are the same, but 220 is the active state check process of the migration destination step, and 221 is the branch process according to the result. And
Reference numeral 222 is a step transition operation mode check process executed while the transition destination step is active, and reference numeral 223 is a branch process depending on the result. In addition, reference numeral 224 denotes error processing executed when the operation mode is designated as an error in the above branch,
Reference numeral 225 is an erasing process of the execution step NO, which is executed when the operation mode is designated to shift. When the operation mode is designated to wait for transition, step 209 is executed similarly to the case where transition is not established.

Next, the operation will be described. In the flowchart shown in FIG. 9, step 200 to step 2
The process up to 11 is the same as that of the first embodiment, but when the transition is established in step 207, the step transition operation mode execution means 38 checks the active state of the transition destination step in step 220, and deactivates in step 221. If so, the execution step NO is deleted and the transfer destination step NO is registered in step 208 as in the conventional case, but if it is active, the step transition operation mode is checked in step 222, and if the operation mode is an error designation in step 223, In step 224, error processing is performed, and when the operation mode is designated as transition, in step 225, the erasing processing of the execution step NO is performed. As a result, the execution step is deactivated, but the transition destination step is already activated and registered, and thus the state becomes the same as that at the time of transition. Further, when the operation mode is designated to wait for transition, the same as when transition is not established, step 209
Carry out. As a result, the execution step does not shift and continues to be executed until the shift destination step shifts again, and enters the shift destination step shift waiting state.

Example 6. Further, FIG. 10 is a step transition operation mode setting screen for setting the transition operation mode of each block in the step transition operation mode execution means of FIG. 1 in a peripheral device (not shown). 80
Is a screen for selecting the operation mode setting at step transition on the auxiliary function menu screen, and 81 is a block No.
It is a screen for setting the operation mode at the time of step transition in response. FIG. 11 is a flowchart showing a flow of a setting operation procedure on a screen for performing block correspondence setting of the operation mode at step transition in the peripheral device (not shown).

Next, the operation will be described. When the function key (F4) is selected in step 110 on the SFC operation screen of the peripheral device shown in FIG. 10, the auxiliary function menu screen 80 is displayed. When the step transition operation mode setting is selected in step 111, the corresponding setting screen 81 is displayed, and the setting is executed in step 112. When the transition is established, the error stop is performed when the transition destination is active, or the transition destination step Wait until the
Specify the range of steps corresponding to each stop mode whether to shift without waiting. When the function key (F4) is selected in step 113 on the corresponding setting screen 81, the execution of the setting is completed, and as a result, the step transition operation mode setting data for each block is created as a parameter. When the peripheral device writes the above parameters to the CPU, the CPU detects the operation mode at the time of step transition for each block by the setting data when executing the SFC program, and when the transition is established, the transition destination step is already active. The action can be performed.

[0033]

As described above, according to the present invention, since the transition holding step is provided, the transition holding can be designated on the SFC program, and the transition holding step executing means is provided, so that the transition is established. The execution step can be continued to be executed after the transfer without deleting the mounting step by the active step changing means at that time, and the transfer destination steps can be activated one after another after the transfer is established. This allows S
When the FC program is executed, a plurality of steps connected in series can be simultaneously executed, and follow-up control of the steps can be enabled, so that there is an effect that the operating rate of the machine or the like corresponding to the steps can be increased.

Further, according to the present invention, since the block stop mode executing means is provided, all active steps are immediately stopped when the SFC program is executed or when the block is stopped, or each active step is stopped when the transition is established. It is possible to select whether or not to perform it, and since it is equipped with a step stop execution means at the time of stop after transition, when it is specified to stop each active step when transition is established when block is stopped, execution step is stopped after transition when transition is established. Since it is possible to specify the state and the step execution management means is provided, it is possible to detect that the step is in the stopped state after the transition and stop each active step when the transition is established. As a result, there is an effect that the block stop control can be used for the purpose of stopping at the completion of the step operation such as the cycle stop as well as the use as the emergency stop at the time of error.

Further, according to the present invention, since the block stop mode setting means is provided, the stop mode setting can be designated for each block. As a result, there is an effect that the block stop control corresponding to the control content of the block can be designated.

Further, according to the present invention, since the active step corresponding block stop mode setting means is provided, the stop mode setting can be designated for each block and the stop mode is designated corresponding to the active step NO. be able to. As a result, there is an effect that the block stop control corresponding to the control content of the block and its operation state can be designated.

Further, according to the present invention, since the step transition operation mode executing means is provided, when a plurality of steps connected in series can be simultaneously executed, the previous step attempted to transit due to the establishment of the transition. If it is already active, you can specify whether to make an error, wait for the migration destination step to migrate and become inactive, or migrate without waiting for the migration destination step to migrate. it can. As a result, there is an effect that it is possible to execute fine control such as checking the transition control of steps, queuing operation of transition, and merging operation of processes operating in parallel.

Further, according to the present invention, since the step transition operation mode setting means is provided, the operation mode setting can be designated for each block. This allows
There is an effect that the transition control of the step corresponding to the control content of the block can be designated.

[Brief description of drawings]

FIG. 1 is a detailed configuration diagram of a microprogram ROM and an active step information storage RAM in a block diagram showing a configuration of a PC according to an embodiment of the present invention.

FIG. 2 shows an example of an SFC program and an example of a controlled object according to an embodiment of the present invention.

FIG. 3 is a flowchart showing a flow for executing a transition holding step while executing an SFC program according to an embodiment of the present invention.

FIG. 4 is a flowchart showing a flow for executing a block stop operation corresponding to a block stop mode while executing an SFC program according to an embodiment of the present invention.

FIG. 5 is a screen for setting block correspondence in a block stop mode according to an embodiment of the present invention.

FIG. 6 is an operation flow when setting for a block in a block stop mode according to an embodiment of the present invention.

FIG. 7 is a screen for setting corresponding to steps in a block stop mode according to an embodiment of the present invention.

FIG. 8 is an operation flow for setting step correspondence in a block stop mode according to an embodiment of the present invention.

FIG. 9 is a flowchart showing a flow of executing a step transition operation corresponding to an operation mode at the time of step transition while executing the SFC program according to the embodiment of the present invention.

FIG. 10 is a screen for setting block correspondence in an operation mode at the time of step transition according to an embodiment of the present invention.

FIG. 11 is an operation flow for setting block correspondence in the operation mode at the time of step transition according to the embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration of a conventional PC and a detailed configuration diagram of a microprogram ROM and an active step information storage RAM among them.

FIG. 13 shows an example of a conventional SFC program.

FIG. 14 is a flowchart showing a flow of a block stop operation while executing an active step of an active block in a conventional SFC program.

[Explanation of Codes] 31 block executing means, 32 step executing means, 3
3 migration execution means, 34 block stop mode execution means, 35 step execution management means, 36 migration hold step execution means, 37 post-migration stop step stop execution means, 38 step transition operation mode execution means, 41
Pointer to each block in the active step information storage table, 42 Active step NO in the active step information table of each block, 43 Step status in the active step information table of each block, 70 Auxiliary function menu screen, 71 Block stop mode Menu screen, 72 block stop mode (block compatible) setting screen, 73 block stop mode (step compatible) setting screen, 80 auxiliary function menu screen, 81 step transition operation mode setting screen.

Claims (6)

[Claims] 1. A programmable controller for executing an SFC program, a block executing means for controlling and executing an entire block of a program, an active step information storage table for storing step numbers of active steps of an active block, and the active step information. The step NO stored in the storage table is checked, the step execution means for executing the operation output thereof, the transition execution means for executing the transition condition to the active step, and the step attribute is checked when the transition is established by the transition execution means. However, if it is a transition holding step, the execution holding step execution means is provided for continuously executing the execution step even after shifting to the next step without deleting the execution step, and for activating the transition destination step one after another when the subsequent transition is established. Programmable controller characterized by . 2. A programmable controller for executing an SFC program, a block executing means for controlling and executing an entire block of a program, an active step information storage table for storing a step NO of an active step of an active block and a status corresponding thereto. And the step number stored in the active step information storage table
And step execution means for executing the operation output,
Transition execution means for executing the transition condition to the active step, and step stop request is checked by the step status of the corresponding step of the active step information storage table, and if there is a stop request, the process of the corresponding step is not executed, If there is no stop request, all active steps are immediately stopped or each active step is stopped when the block is stopped by the step execution management means for executing the processing of the corresponding step and the block execution means. If the mode selected by the block stop mode execution means is the stop mode after the transition when the transition is established by the block execution mode execution means for selecting whether or not the transition execution means, the step of the corresponding step checked by the step execution management means Set the status so that it is in the stopped state after transition, Programmable controller comprising the migration post stop step stops execution means for stopping so as not to perform the appropriate activity steps from the times. 3. The programmable controller according to claim 2, wherein the block stop mode executing means includes block stop mode setting means for specifying a stop mode setting for each block. 4. The block stop mode executing means sets a stop mode for each block and activates step NO.
3. The programmable controller according to claim 2, further comprising active step corresponding block stop mode setting means which is designated in correspondence with. 5. The transition holding step executing means,
If a plurality of steps connected in series are executed at the same time, and the step to be transferred when the transfer is established by the transfer execution means is already active, an error occurs or the transfer destination step moves and becomes inactive. 2. The programmable controller according to claim 1, further comprising: a step transition operation mode execution means for selecting whether to transition after waiting for the transition or after transition of the transition destination step. 6. The programmable controller according to claim 5, wherein the step transition operation mode execution means includes step transition operation mode setting means for designating an operation mode setting for each block.