Basic Alarm / Fault Best PracticesĪs you work & observe the Alarm structures within PLC applications, you’ll notice that they generally follow a similar structure. The final outcome will be determined by the programmer.
However, the programming of these is absolutely the same. In other words, there are two types of errors: one which will cause a stop and the other which will not. 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. Whatever the source of the error, the system must be able to capture the occurrence and to act accordingly.Ī common question and debate between PLC programmers is the distinction between the levels of faults & the proper designation of each one. These conditions can be detected by sensors, be the result of certain operator errors or be programmed in software. Ultimately, this code is needed to make sure that equipment is brought to a safe condition after a critical failure. This logic allows the programmer to capture any abnormalities, alert the operator of a failure, and prevent system damage.
Alarms, Faults, and Warning play a critical role within every PLC Program.
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