This article is about FB sequencer block in Siemens TIA portal. In the process industry where we use batch process to add different ingredients and mix up them using an...
Develop ladder logic program for a display sign that will sequentially turn ON. Three lights (L1, L2, L3) 3 sec apart. Turn Off all the lights after 6 sec. Three...
The PLC Sequencer Instruction (SQO) is an output instruction. SQO instructions can perform the same specific “ON” or “OFF” patterns of outputs that are continuously repeated. The advantage of sequencer...
As we have seen with counter and timers, some PLC instructions generate digital values other than simple Boolean (on/off) signals. Counters have current value (CV) registers and timers have elapsed...
The IEC 61131-3 standard specifies several dedicated ladder instructions for performing arithmetic calculations. Some of them are shown here: PLC Math instructions As with the data comparison instructions, each of...
A counter is a PLC instruction that either increments (counts up) or decrements (counts down) an integer number value when prompted by the transition of a bit from 0 to...
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