PLC Programming to Control Lights in a Sequence
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...
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PLC Sequencer Instruction with Example
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...
PLC Data Comparison Instructions
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...
PLC Math instructions
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...
PLC Counter Instructions
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...