JPH01211005A - sequence controller - Google Patents

Abstract

PURPOSE:To decrease the number of parts and to promote the standarization with a sequence controller by dividing mechanically a circuit into an input converting part for various specifications and a common input control part and connecting electrically these two separated circuits to each other. CONSTITUTION:A programmable sequence controller PSC consists of a CPU 1, signal input circuits 200-299, signal output circuits 300-399, and a power supply unit. Each of the circuits 200-299 contains a common input control part 22, an input converting part 20 which differs by the specifications, and an insulated circuit which connects both parts 22 and 20. While each of the circuits 300-399 also contains an output control part 32, an output converting part 30 which differs by the specifications, and an insulated circuit 31 which connects electrically both parts 32 and 30.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention particularly relates to a programmable sequence controller (hereinafter simply referred to as PC8) having a function of electrically insulating a signal input terminal and arithmetic means, and a signal output terminal and arithmetic means. ).

[Conventional technology]

It is known from Utility Model Application Laid-open No. 59-96602 to electrically insulate between the signal input terminal and the calculation means and to electrically insulate the signal output terminal and the calculation means in the PC8.

It is also possible to configure the central processing unit, input module, and output module as separate units.
It is known from Japanese Patent No. 9-119799.

[Problem to be solved by the invention]

In the conventional PC8, multiple signal input terminals or multiple signal output terminals can be modularized to some extent as input modules and output modules, and can be separated from calculation means, making it possible to handle input/output modules with various specifications. I was able to combine them.

However, when looking at input modules with various specifications, the only part that differs depending on the specification is the part from the input terminal to the isolation circuit, that is, the input conversion section, and in the case of the output module, the part from the isolation circuit to the output terminal differs depending on the specification. The only part is the output converter, and the rest are the same.

Despite this, conventionally, an input module has an input control section, an isolation circuit, an input conversion section, and a signal input terminal integrated into one, and an output module has an output control section, an isolation circuit output conversion section, and a signal output terminal integrated into one. Therefore, we had to prepare everything according to the specifications.

The present invention has been made in view of these points, and its purpose is to further promote standardization by reducing the number of parts that must be replaced according to specifications to a far lesser extent than in the past. It is in.

[Means to solve the problem]

The purpose is to mechanically separate the signal input circuit into input conversion sections with various specifications and input control sections that are common to all signal input circuits.

This can be achieved by simply electrically connecting two separated circuits. In addition, in the signal output circuit, it is possible to mechanically separate the output conversion sections with various specifications and the output control section that is common to all signal output circuits, and to easily connect the two separated circuits electrically. This can be achieved by

In order to achieve the above, it is preferable to adopt one type of connector that incorporates a plurality of insulating circuits, and the other type of terminal block that incorporates a plurality of input converters or output converters.

[Effect]

The signal input circuit is separated into an input control section and an input conversion section that are common to all specifications. Similarly, the signal output circuit is separated into an output controller and an output converter that are common to all specifications. These are connected to each other by a connector type insulation circuit. As a result, the input conversion section having the required specifications is electrically isolated and connected to the input control section. or.

Various combinations of signal input circuits and signal output circuits can be constructed by the operation of zero or more necessary output conversion sections electrically insulated and connected to the output control section.

In addition, by mounting a terminal block with a built-in input conversion section or output conversion section on an input control section or output control section with an insulation circuit added, various combinations of signal input circuits and signal output circuits can be configured. Can be done.

Note that when the input conversion section and the output conversion section are built into the terminal block, an insulation circuit can also be built into the terminal block.

〔Example〕

Embodiments of the present invention shown in the figures will be described below.

FIG. 1 is a block diagram of PO2 according to the present invention.

This PO2 has a central processing unit indicated by 1, and 200...
- Consists of a signal input circuit indicated by 299, signal output circuits indicated by 300...399, and a power supply unit (not shown).

The power supply unit receives commercial power, converts it to the voltage level required by the central processing unit 1, the signal input circuits 200...299, and the signal output circuits 300...399, and rectifies it. Or, when the commercial power supply is out of power, backup power is supplied to maintain the user program written in the user program storage means 12. The central processing unit 1, the signal input circuits 200...299, and the signal output circuits 300...399 are connected in parallel to the parallel I10 bus 4.

The central processing unit 1 has a calculation means 11, a user program storage means 12, and a system program storage means 13.

A sequence program written by the user is written in the user program storage means 12, and a system program necessary for operating the PO2 according to the sequence program is written in the system program storage means 13.

Based on a user program, the calculation means 11 inputs signals to signal input terminals Ti, .

Now, only a part of it is shown in Figure 1.

The respective terminals indicated by Ti1...Ti and the common terminal T
A rectifier circuit is connected between i□□...T i, as shown in the input circuit 2C as an input conversion section 20, and a photo-isolator Li is connected to the output side of the rectifier circuit as shown in an insulating circuit 21. □...L i32 is connected.

This photo isolator has a signal input terminal T i-1...
It serves to electrically insulate the Ti 32 and the parallel I10 bus 4 and to transmit signals. The human/motor control unit 22 is composed of a buffer circuit 22a and a gate circuit 22b.

The output of each photo isolator is T
The signal is converted to the TL level and inputted to the calculation means 11 via the gate 22b and the parallel I10 bus 4.

Only a portion of it is shown in Figure 1.

TO...The respective output terminals indicated by TO12 and the common terminal Toff3...TO3 are connected from the calculation means 11 to the parallel I10 bus 4, gate 32c, latch 32b, buffer circuit 32a, isolation circuit 31, and output conversion section 30. The configuration is such that the signal is output through the

The output control section 32 includes a gate 32C and a latch 32.
b. A buffer circuit 32a is included.

Now, the isolation circuits 21 and 31 are connected to the input control section 22.
Since the configuration is such that the input conversion section 20 or the output control section 32 and the output conversion section 30 are connected, the second
The isolation circuit 21.31 is constructed using a connector with a built-in photoisolator as shown in Figures (a') and (b), and the input converter or output converter is connected to various connectors as shown in Figures 4 and 5. Various input/output combinations can be obtained by selecting from the specifications.

In addition, Fig. 4 (a) shows AC input of 85V to 264V, (b)
) is a DC input and 24V to 48V (c) is a circuit that also inputs a TTL level with a DC input, as shown in Figure 5 (
In a), the load is a transistor and a zinc load, and in (b), the load is the same transistor, and the source load (C) is a TTL level.

In addition to these, there are many other types of input converters and output converters.

Since these are already known from the PO2 catalogs of various companies, detailed explanations will be omitted.

Furthermore, the same effect can be obtained by using a terminal block 40 as shown in FIG. 3, which incorporates the insulation circuit 21 or 31 and converters of various specifications as shown in FIGS. 4 and 5, respectively. can.

Note that the insulating circuit may not be provided in the terminal block 40 but may be provided together with the input controller section 22 and the output controller section 32.

〔Effect of the invention〕

According to the present invention, as is clear from the above description, various combinations of inputs and outputs can be easily implemented in PO2. Standardization can be further promoted.

[Brief explanation of the drawing]

Figure 1 is a block diagram of an embodiment of the PC5 of the present invention, Figure 2 is a conceptual diagram of a connector with a built-in photo isolator, Figure 3 is a conceptual diagram of a terminal block with a built-in input circuit/output circuit, and Figure 4 is an input circuit section. FIG. 5 is an example of the output circuit section. 1... Central processing unit, 11... Arithmetic means. DESCRIPTION OF SYMBOLS 12... User program storage means, 13... System program storage means, 200... Signal input circuit, 2o... Input conversion part, 21... Isolation circuit, 22.
...input control section, 300...signal output circuit,
30... Output conversion section, 31... Insulation circuit, 32...
・Output control section, '1st $ 2 Figure 3 Figure, ll, Jl Figure 4

Claims (1)

[Claims] 1. A signal input circuit having a plurality of signal input terminals, a user program storage means for storing a sequence program, a system program storage means, and a system program stored in the system program storage means. Under its jurisdiction, based on the user program, a calculation means for calculating the state of the input signal input to the signal input terminal as a variable, and a signal output terminal for outputting a signal according to the calculation result executed by the calculation means. The signal input circuit has an insulating circuit that electrically insulates the signal input to the signal input terminal and transmits it to the input control section, and an insulating circuit located between the insulating circuit and the signal input terminal. The system has a built-in input conversion section that converts the signal input to the signal input terminal into a signal that can be transmitted to the input control section via the isolation circuit, and a gate, and this gate is controlled by the system program. and the input control section that opens under the insulating circuit and sends the output of the insulating circuit toward the calculation means, the input conversion section being mechanically connected to the input control section. A sequence controller characterized by having a removable structure. 2. A plurality of signal input terminals, a user program storage means for storing sequence programs, a system program storage means, and under the jurisdiction of the system program stored in the system program storage means, the user program is stored in the user program. Based on the signal input terminal, the signal output circuit has a calculation means for calculating the input signal state inputted to the signal input terminal as a variable, and a signal output terminal for outputting a signal according to the calculation result executed by the calculation means. The signal output circuit is located between an insulation circuit that electrically insulates the output signal of the output control section and transmits it to the output conversion section, and the insulation circuit and the signal output terminal, and the signal output circuit is located between the insulation circuit and the signal output terminal. It has a built-in output conversion section that converts the output of the output into a signal suitable for the load connected to the signal output terminal and transmits the signal to the signal output terminal, and a gate, and the gate is controlled under the control of the system program. and the output control section for sending the output of the arithmetic means toward the insulating means, wherein the output conversion section has a structure that can be mechanically removed from the output control section. A sequence controller comprising: 3. A terminal block having a signal input terminal and an input conversion unit that converts the signal input to the signal input terminal into a signal that can be input to an insulating circuit that electrically insulates and outputs the signal. 4. A terminal block having a signal output terminal and an output converter that converts an input signal into a signal suitable for a load connected to the signal output terminal.