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plc unit and programmable logic controller

A technology of programming logic and controller, which is applied in the direction of program control, program control, electrical program control, etc. in sequence/logic controllers, and can solve the problems of increased unit manufacturing costs and other issues

Active Publication Date: 2019-03-08
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally, in order to improve SFF, it is necessary to use high-grade components or to use a large number of components, resulting in an increase in the manufacturing cost of the unit

Method used

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  • plc unit and programmable logic controller
  • plc unit and programmable logic controller
  • plc unit and programmable logic controller

Examples

Experimental program
Comparison scheme
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Embodiment approach

[0032] figure 1 It is a figure which shows the structure of embodiment of the programmable logic controller which used the PLC unit which concerns on this invention. The programmable logic controller 10 has a base 1 , a CPU unit 2 , an input unit 3 , and an output unit 4 .

[0033] The CPU unit 2 executes the sequence program based on the input value input from the input unit 3 , generates an output value, and outputs the generated output value to the output unit 4 . The input unit 3 receives an input signal from the safety input device 5 and outputs an input value, which is a value indicated by the input signal, to the CPU unit 2 . The output unit 4 receives the output value from the CPU unit 2 and outputs it to the safety output device 6 as an output signal. In addition, the safety input device 5 is an external device connectable to the input unit 3 and is a device that transmits an input signal to the input unit 3 . As an example, the safety input device 5 is an emergenc...

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Abstract

A programmable logic controller system has: an input unit system section in which plural input units are combined; a CPU unit system section in which plural CPU units are combined; and an output unit system section in which plural output units are combined. Each system section has: a setting retaining unit to retain a setting indicating whether to use any of the plural units alone or use the plural units in a multiplexed manner; and a comparing unit to make a comparison of processed data between the plural units when the setting indicates using the plural units in a multiplexed manner, to send the processed data if the comparison result indicates consistency, and to perform an error process if the comparison result indicates inconsistency. In the setting retaining unit, whether to use alone or in a multiplexed manner is set based on an externally-input setting instruction.

Description

technical field [0001] The invention relates to a PLC unit and a programmable logic controller compatible with functional safety standards. Background technique [0002] Currently, for units compatible with the Safety Integrity Level (hereinafter referred to as SIL, Safety Integrity Level) 2 in the IEC61508 functional safety standard, the system's tolerance to faults (hereinafter referred to as HFT, Hardware Fault Tolerance) When it is 0, the safe failure fraction (hereinafter referred to as SFF, Safe Failure Fraction) specified by the IEC61508 safety standard needs to be greater than or equal to 90%. In addition, for units compatible with SIL2, when HFT is 1, SFF needs to be greater than or equal to 60%. In addition, the so-called HFT being 0 means that a system function is lost due to a failure of a system function. In addition, the so-called HFT being 1 means that the system function is lost due to failure of two system functions. [0003] Also, for a unit compatible w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/05
CPCG05B19/058G05B2219/14006
Inventor 杉山绿内越正弘新开孝一
Owner MITSUBISHI ELECTRIC CORP