PLC Alarm Programming - Fault Capturing Example in Ladder Logic RSLogix 500 Allen Bradley

PLC Alarm Programming - Fault Capturing Example in Ladder Logic RSLogix 500 Allen Bradley

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Alarms, Faults, and Warning play a critical role within every PLC Program. This logic allows the programmer to capture any abnormalities, alert the operator of a failure, and prevent system damage. Ultimately, this code is needed to make sure that equipment is brought to a safe condition after a critical failure.

These conditions can be detected by sensors, be the result of certain operator errors or be programmed in software. Whatever the source of the error, the system must be able to capture the occurrence and to act accordingly.A common question and debate between PLC programmers is the distinction between the levels of faults & the proper designation of each one.

My approach is quite simple: a fault will cause a stop of a certain process; a warning will only be a visual indication for the operator. In other words, there are two types of errors: one which will cause a stop and the other which will not. However, the programming of these is absolutely the same. The final outcome will be determined by the programmer.

Full Tutorial: TBD

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