JPH0574976B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a network system having an emergency signal processing function.

[Description of Prior Art] In a conventional network system, each terminal is connected to a node and the nodes are connected to each other via a data signal line formed by, for example, a serial cable, and data is exchanged between them. .

Therefore, if an emergency situation such as an emergency stop occurs on the terminal side and it is necessary to contact other terminals urgently,
Alternatively, when it is desired to urgently issue an emergency command to a specific terminal from a management standpoint, software processing according to the protocol is performed, and then the signal is placed on the data signal line and connected to other terminals. For this reason, extra time was wasted for, for example, packet assembly, disassembly, etc., as well as other software processing time and serial signal processing time, and the purpose of emergency processing could not be fully achieved.

These problems often cause emergency signals.
This often occurs in FA network systems.
Particularly in local area network systems for FA, it is desired to solve this problem as soon as possible. Further, although the frequency with which the above problem occurs is low, there is a similar desire for faster processing of emergency signals in other network systems.

[Object of the Invention] An object of the present invention is to improve the above problems and provide a network system that can process emergency signals at higher speed.

[Structure of the Invention] A network system for achieving the above object is a network having an emergency signal processing function characterized in that terminal input/output units for transmitting and receiving emergency signals are interconnected via a hardware logic circuit. It is a work system.

[Explanation of Examples] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a system block diagram of an example of a star and loop type network system. This example is a mixed system of star type and loop type.
This is an example of an FA network system that can be used in a wide range of situations, from small to large scale.

A plurality of loop processing modules RPM are connected in a loop via a serial data line, and a star processing module STM is connected to each loop processing module via a data line. Each star processing module STM has multiple terminals T, T.
are connected.

Examples of terminals include machine tools, personal computers, data banks, and other management equipment (CRTs, printers,
etc.). In this example, terminals T, T
An example is shown in which four units are connected, but 1 to 10 units (this number can be freely designed) can be freely connected via connectors. Note that this connection state can be constantly grasped by a state management unit (located within the star processing module or within a management device connected as one of the terminals).

In FIG. 1, among the connection lines, solid lines indicate data lines, and broken lines indicate input/output lines. Any of the signal lines can be configured using twisted pair wires, optical fibers, or other communication lines, but of course, if optical fibers are used, they must be provided with an appropriate optical-to-electrical signal conversion function. It is. Each terminal, including the management device, can communicate with each other via a data line using a predetermined protocol, for example, using a packet transmission method.

Figure 2 shows a block diagram of the star processing module STM. 2 of multiple connected devices
Only the two terminals are shown as T ₁ and T ₂ .

Star processing module STM is CPU1, ROM
3. Has 5 RAM and connects via system bus BUS
PTM (Programmable Timer) 7, PIC
(Programmable Interrupt Controller) 9 and UART provided for serial transmission
(Universal Asynchronous Receiver/
Transmitters) 11, 13, . . . , 15 and a gate array 17 are connected. Each terminal T ₁ , T ₂ ,
and the loop processing module mentioned above is the UART1
1, 13, 15, through the system bus BUS
are connected to each. Furthermore, each UART is
USART (Universal Synchronous Recriver/
Transmitter) is also fine. As shown by broken lines, each terminal T ₁ , T ₂ and the gate array 17 are connected by input/output signal lines L, L.

Figure 3 shows the star processing module STM and each terminal.
FIG. 2 is a block diagram showing in detail the connection state of input/output signal lines connecting T ₁ and T ₂ ;

The star processing unit 19 in FIG. 3 includes the CPU 1, ROM 3, RAM 5, PTM 7, and
It is a general term for PIC9, UART11, 13, and 15.
The connectors C ₃ and C ₄ on the star processing module side and the connectors C ₁ and C ₂ provided on each terminal T ₁ and T ₂ are data signal pins, input signal pins,
It is composed of three types of output signal pins, and uses, for example, a connector specified by JIS (Japanese Industrial Standard) C6361. For input signal pins and output signal pins, reserve pins specified in JISC6361 are used, for example, input signal lines are 9, 10, 1.
Connect the three pins number 1, and the output signal line to 12,1
Three pins numbered 3 and 14 are used.

The input/output signal line L is composed of input signal lines 21 and 23 and output signal lines 25 and 27. On the other hand, the terminal
The input/output sections 29 and 31 in T ₁ and T ₂ are composed of a push button switch PB, a limit switch LS, a relay RL, an electromagnetic coil MC, etc. In this example, both terminals have a push button switch PB and a limit switch LS.
The input parts 29a and 31a are constructed by the relay RL and the electromagnetic coil MC, and the output parts 29b and 31b are constructed by the relay RL and the electromagnetic coil MC.

Further, an input module 33 is provided in the input sections 29a and 31a, and an output module 35 is provided in the output sections 29b and 31b. Input module 3
3 is formed by an encoder or multiplexer and encodes the input signal and sends it to the gate array 17.
The output module 35 is formed by a decoder or demultiplexer and decodes the output signal sent from the gate array 17 and activates a relay or electromagnetic coil. Note that communication modules 37, 37 are provided inside the terminals T ₁ and T ₂ , and data communication is performed via these communication modules.

Gate array 1 as a hardware logic circuit
7 has a logic operation function, and input signal lines 21, 2
3 performs a logical operation on the signal inputted through the signal line 3 and sends the result to the output signal lines 25 and 27. The calculation is performed in order to operate predetermined actuators of the output sections 29b and 31b depending on the contents of the emergency signal. In addition,
A line 39 between the gate array 17 and the star processing unit 19 is used to send the operating status of the gate array 17 to the status storage section in the star processing unit and manage the entire system. It can also be used to send command signals from the module RPM or from the star processing unit 19 itself to the outputs 29b, 31b.

In the configuration of the above embodiment, the emergency signal processing method will be explained with reference to FIG.

Now, limit switch LS for emergency stop of terminal _T1
Suppose that it is activated. Examples of this emergency stop signal include when the overtravel function of a machine tool is activated, when the oil temperature of a hot water pressure equipment rises abnormally, or when a contact sensor that recognizes an abnormal object is activated. Here, it is assumed that the overtravel function of the machine tool is activated.

The signal from the limit switch LS is encoded via the input module 33 and sent to the input signal line 2.
A logical operation is performed in the gate array 17 via 1.
This logical operation is based on the activated limit switch LS.
The actuator that should be stopped in a predetermined manner is selected based on this understanding. Here, if the terminal T ₂ is, for example, a machine tool that operates in conjunction with the terminal T ₁ , it is assumed that only the interlocking portion of the terminal T ₂ should be brought to an emergency stop. Therefore, the gate array 17 performs a logical operation to emergency stop this interlocking portion, and sends a signal to that effect to the output module 35. The output module 35 decodes the signal and operates a relay RL or an electromagnetic coil MC that is linked to a predetermined actuator.

In this way, the relay RL or the electromagnetic coil MC of the terminal _T2 is activated, and this result is transmitted to the state management section of the star processing unit 19 via the line 39 or to other terminals via the loop processing module RPM. It is transferred to the state management unit and used as a reference for system control. Furthermore, if the input signal that has reached the gate array is of a priority that affects the entire system, it is of course activated to stop the entire system. Of course, equipment that does not need to be stopped can be left as is.

The above emergency signal flow is performed at the hardware level, and the emergency signal is immediately transmitted.
A similar explanation can be given when the pushbutton switch PB is pressed on the terminal _T1 side.

[Effects of the Invention] As can be understood from the above description of the embodiments, the present invention connects a plurality of loop processing modules RPM in a loop via a serial data line, and connects each of the above loop processing modules.
A network system having an emergency signal processing function is constructed by connecting a star processing module STM to the RPM via a data line and connecting a plurality of terminals T to each of the star processing modules STM. , a star processing unit 19 that is connected to the loop processing module RPM and each communication module 37 provided in each terminal T via a data line and that controls the star processing module STM; connected through
and a gate array 17 that performs a logical operation on which terminal should be stopped in an emergency based on the signal input from the input module 33 of each terminal T, and sends an emergency signal to the output module 35 provided in the terminal. It is.

As is clear from the above configuration, in the present invention, the star processing module STM connected to the loop processing module RPM is connected to the loop processing module RPM and each communication module 37 provided in each terminal T via a data line, It also includes a star processing unit 19 that controls the star processing module STM.

That is, in the present invention, each terminal T, star processing module STM, loop processing module
Data communication with RPM is performed via a communication module 37 and a data line.

Further, the star processing module STM includes a gate array 17, and this gate array 1
7 is connected to the star processing unit 19 via a line 39, and the gate array 17 performs a logical operation on the terminal to be stopped urgently based on the signal input from the input module 33 of the terminal T, and Since the emergency signal is sent to the output module 35 prepared for It is something.

[Brief explanation of drawings]

The drawings all show embodiments; Fig. 1 is a system block diagram of a star and loop mixed type FA local area network system, Fig. 2 is a configuration block diagram of a star processing module, and Fig. 3 is a block diagram of a star processing module.
The figure is a block diagram showing in detail the line connection state of the star processing module and each terminal. 17... Gate array, 19... Star processing unit, 21, 23... Input line, 25, 27...
...Output line, 29, 31...Input/output section, 33...
Input module, 35... Output module, C ₁
~ _C4 ...Connector.

Claims (1)

[Claims] 1. A plurality of loop processing modules RPM are connected in a loop via a serial data line, a star processing module STM is connected to each of the loop processing modules RPM via a data line, and each of the star processing modules Multiple terminals T in processing module STM
The star processing module STM is connected to the loop processing module RPM and each communication module 37 provided in each terminal T via a data line, and A star processing unit 19 that controls the star processing module STM, and a terminal that is connected to the star processing unit 19 via a line 39 and that is to be stopped in an emergency based on a signal input from the input module 33 of each terminal T. A network system having an emergency signal processing function, comprising: a gate array 17 that performs logical operations and sends an emergency signal to an output module 35 provided in the terminal.