As we have seen with counter and timers, some PLC instructions generate digital values other than simple Boolean (on/off) signals.
The IEC 61131-3 standard specifies several dedicated ladder instructions for performing arithmetic calculations. Some of them are shown here: PLC
A counter is a PLC instruction that either increments (counts up) or decrements (counts down) an integer number value when
This is Program for Siemens PLC Mathematics Instructions. Siemens PLC Math Instructions Implement ADD, SUB, MUL, DIV, MOD and NEG