Contents of regular testing for the PLC in the SIS system
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For the PLCs in SIS systems, regular functional testing is required to ensure their reliability. What are the main aspects of functional testing for PLCs? Will the test results include an explanation of the product failure data?
What needs to be checked? Are it specific tests?
Will regular simulated interlocking work?
Periodic inspection, interlock circuit testing
It refers to the channel loop testing. Generally, the relevant points need to be forced first; in other words, the interlocks are temporarily disabled, and then the normal state is restored after the testing is complete. This applies to digital input as well – usually, the connections on-site are shorted to check the status on the computer. Digital output is particularly important, as it’s necessary to confirm whether signals are received on the field side. There’s also analog input, where a signal generator sends signals and the display on the computer is used to monitor them. It’s advisable to have a professional carry out this task