JPH06324722A - Programmable controller - Google Patents

Abstract

PURPOSE:To provide the programmable controller in which addition of a special function is inexpensively realized without loss of high speed processing and the entire cost of the programmable controller is minimized when no special function is added. CONSTITUTION:The programmable controller in which plural input output units 40-1, 40-2 are connected to a CPU unit 10 executing a predetermined program via a base unit is provided with PCB modules 70-1, 70-2 executing a special function and the PCB modules 70-1, 70-2 are mounted in the CPU unit 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller, and more particularly to a programmable controller to which special functions can be added.

[0002]

2. Description of the Related Art Generally, a programmable controller has an input / output function for inputting / outputting ON / OFF information,
It is configured so that a special function for executing the special function can be added.

Here, the contents of this special function are as follows.

1) A function for connecting to a remote input / output unit, a host computer, and a plurality of distributedly controlled programmable controllers by communication 2) A function for operating with another software language such as BASIC 3) High speed such as an encoder Function to input pulse 4) Function to control positioning by connecting with servo motor driver etc. 5) Function to connect special sensor or display etc. By the way, if such special function is added in the past, Provide a special unit to execute special functions,
This special unit is connected to the central processing unit (hereinafter, CP) of the programmable controller via the base unit.
It is realized by connecting to U unit).

FIG. 3 is a block diagram showing a conventional programmable controller configured as described above. An operation execution unit 11 including a microprocessor, an input / output data memory (I / O data memory) 12, an internal unit. The special units 30-1 and 30-2 are connected to the CPU unit 10 configured by connecting the program memory 13 via the internal bus 14 via the CPU bus 22 and input via the I / O bus 21. It is configured by connecting the output units 40-1 and 40-2. Here, the special units 30-1, 30
2 is a shared memory 31 and a special function executing unit 32, respectively.
It is configured to include.

FIG. 4 shows the appearance of a conventional programmable controller having such a configuration. The CPU unit 10 and the power supply unit 50 are the base unit 2.
3, the base unit 23 is provided with the I / O bus 21 and the CPU bus 22 shown in FIG. 3, and the special unit 30 is a CPU for the special unit provided in each slot of the base unit 23. Bus connector 2
2-1 is connected to the CPU bus 22 of the base unit 23, and the input / output unit 40 is provided in each slot of the base unit 23 by the I / O bus connector 21- for the input / output unit. 1 to the I / O bus 21 of the base unit 23.

That is, the special units 30-1 and 30-2 are different from the input / output units 40-1 and 40-2 in that
Since the amount of data to be transferred is large and the allocated memory area is different, the input / output units 40-1, 40-2
Is connected to a CPU bus 22 different from the I / O bus 21 to which is connected.

[0008]

However, according to such a conventional configuration, each slot of the base unit has an I / O for connecting a CPU bus connector for connecting a special unit and an input / output unit. It requires two connectors, a bus connector and a CPU unit side, in addition to the configuration connecting to the I / O bus of the base unit, the configuration connecting to the CPU bus of the base unit. In addition, it was an obstacle to miniaturization of the programmable controller.

Further, there is also a disadvantage that a user who does not need the special unit will bear an extra cost for the structure provided for adding these functions.

The CPU bus has more signal lines than the I / O bus, and the provision of the CPU bus in the base unit leads to high cost.

In the conventional programmable controller, the I / O bus connector and the CPU bus connector are shared and the input / output unit and the special unit are connected to the same connector in order to realize miniaturization. There are some possible configurations, but such a configuration has an I / O bus and a CP.
The U-bus is switched to connect to the same connector. According to this configuration, a circuit for determining whether the connector is connected to an input / output unit or a special unit, and an I / O bus Therefore, a circuit for switching between the CPU bus and the CPU bus is required, which causes another problem such as the generation of overhead and the complication of software due to the switching processing.

Further, there is a programmable controller which does not use the base unit, but in the case of this configuration, FIG.
As shown in FIG. 3, the programmable controller 100 is provided with output terminal block connectors 100a and 100b, and a bus connector 100c for connecting to the special unit 30.
Further, the special unit 30 is provided with a bus connection connector 30a for connecting to the programmable controller 100, and the bus connector 100c of the programmable controller 100 and the bus connection connector 30a of the special unit 30 are provided at both ends of the bus connection connector harness. 60
The connection line 60 having a and 60b is used for connection, and in this case, the connectable special unit 3 is used.
There is a problem that the number of 0s is limited and the configuration is complicated and the cost is high.

Therefore, according to the present invention, the addition of the special function can be realized at a low cost, the high-speed processing is not impaired, and the cost of the entire programmable controller can be minimized when the special function is not added. An object is to provide a programmable controller that can perform.

[0014]

In order to achieve the above object, the present invention is a programmable controller configured by connecting a plurality of input / output units via a base unit to a central processing unit for executing a predetermined program. In the above, a programmable controller board module that executes a special function is provided, and the programmable controller board module is configured to be attachable to the central processing unit.

[0015]

According to the present invention, the programmable controller board module for executing the special function is provided, and the special function of the programmable controller is realized by mounting the programmable controller board module on the central processing unit as required.

With such a configuration, it is not necessary to provide a CPU bus in the base unit, and the configuration is such that the CPU unit and the CPU bus in the base unit are connected and the CPU bus in the base unit and the special unit are connected. Since a special function is not required, the special function can be added at a low cost, the processing speed is not impaired, and the cost of the entire programmable controller can be minimized when the special function is not added. .

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a programmable controller according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a programmable controller according to the present invention. In addition, in FIG. 1, the same reference numerals as those used in FIG. 3 are attached to the portions that perform the same functions as those of the conventional configuration shown in FIG.

In FIG. 1, a plurality of input / output units 40 are provided.
-1, 40-2 are connected to the CPU unit 10 via the I / O bus 21.

The CPU unit 10 includes an arithmetic execution unit 11 including a microprocessor and an input / output data memory (I
I / O data memory) 12 and internal program memory 13, and input / output data memory (I / O data memory) 1
2 and the internal program memory 13 are connected to the arithmetic execution unit 11 via the internal bus 14.

By the way, in this embodiment, the special function of the programmable controller is assigned to the CPU unit 10.
It is realized by a plurality of programmable controller board modules (hereinafter, referred to as PCB modules) 70-1 and 70-2 that are configured so that they can be attached to and connected to the.

The PCB modules 70-1 and 70-2 are
As shown in FIG. 1, the PCB modules 70-1 and 70-2 are configured so that they can be mounted on the CPU unit 10 and are mounted on the CPU unit 10.
It is connected to the internal CPU bus 220 which is connected to the arithmetic execution unit 11 of the CPU unit 10.

Here, the PCB modules 70-1 and 70
-2 is the special unit 30-1, 30-2 shown in FIG.
Similarly, a shared memory 71 and a special function executing unit 72 for realizing predetermined special functions are provided.

FIG. 2 shows the appearance of the programmable controller having the above-mentioned configuration. The CPU unit 10 and the power supply unit 50 are connected to the base unit 23, and the base unit 23 has the I / I shown in FIG.
The O bus 21 is provided, and the input / output unit 40 is connected to the I / O bus 21 of the base unit 23 via the I / O bus connector 21-1 for the input / output unit provided in each slot of the base unit 23. To be done.

In the structure shown in FIG. 2, since only the input / output unit 40 is detachably connected to the base unit 23, the base unit 23 has a CPU for a special unit as shown in FIG. Bus connector 22
-1 becomes unnecessary.

The PCB module 70 is inserted into the hole 10a of the CPU unit 10 so that the CPU unit 1
0, in which case the PCB module 70 is connected to the internal CPU bus 220 of the CPU unit 10 shown in FIG. 1 via the connector 70a.

According to this structure, the following effects can be expected.

1) In the CPU unit 10, this CPU
A configuration for providing a CPU bus to the outside of the unit 10 becomes unnecessary, and the size can be reduced.

Further, the connector 70a and the like required when mounting the PCB module 70 on the CPU unit 10 may be mounted in advance by the manufacturer in accordance with the user's order, so that the user who does not need this special function can use it. On the other hand, the connector and the like can be omitted and the cost is reduced.

2) The base unit 23 does not require a connector for connecting the CPU bus, and the signal line of the CPU bus is eliminated, so that the PWB area can be reduced, and the size and cost can be reduced.

3) Since the part that executes the special function is the PCB module, it is possible to add the special function without adding a cost such as a case.

4) The CPU bus and the I / O bus can be separated while minimizing the cost and realizing the miniaturization, and the simplification of the software can be realized while maintaining the performance.

5) For a user who does not need the special function, most of the parts for adding the special function can be deleted, so that the cost can be minimized.

[0034]

As described above, according to the present invention,
A PCB module that executes special functions is provided, and the PCB is
Since the special function of the programmable controller is realized by mounting the module on the CPU unit as needed, the special function can be added at a low cost, and the processing speed is not impaired. When the special function is not added, the cost of the programmable controller as a whole can be minimized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a programmable controller according to the present invention.

FIG. 2 is a perspective view showing the appearance of the programmable controller shown in FIG.

FIG. 3 is a block diagram showing a schematic configuration of a conventional programmable controller.

FIG. 4 is a perspective view showing the external appearance of the conventional programmable controller shown in FIG.

FIG. 5 is a perspective view showing another configuration of a conventional programmable controller.

[Explanation of symbols]

 10 Central Processing Unit (CPU Unit) 11 Operation Execution Unit 12 Input / Output Data Memory (I / O Data Memory) 13 Internal Program Memory 14 Internal Bus 21 I / O Bus 21-1 I / O Bus Connector 23 Base Unit 40- 1, 40-2 Input / output unit 50 Power supply unit 70-1, 70-2 PCB module 70a connector 220 Internal CPU bus

Claims (1)

[Claims] 1. A programmable controller configured by connecting a plurality of input / output units via a base unit to a central processing unit for executing a predetermined program, wherein a programmable controller board module for executing a special function is provided. A programmable controller characterized in that a programmable controller board module can be mounted on the central processing unit.