PLC COUNTERS
Counters in PLC programming serve as invaluable tools for keeping track of various processes and events within industrial automation systems . Their operation revolves around monitoring input signals, which could be anything from sensor readings to specific conditions in the production line. Types of PLC counters There are two main types of PLC counters, the count-up counter, and the count-down counter. For the counter-up counters, we have a counter file name, a counter preset value, a counter accumulated value, a counter count-up bit, and a counter done bit. For the counter-down counters, we have the same bits and values. The only thing that is different is the counter-down bit on the output. As you can see below, we have this as counter-up bit for the counter-up counter. There are also two internal memory bits of counter overflow and counter underflow which we’ll discuss later in this article. PLC counter values The counter file name is a PLC tag. ...