Answer Posted / vicki

scan time is the time taken by DCS/PLC to read inputs,
execute program and as per input/logic update outputs
accordingly. PLC scan time depends on no. of inputs,
outputs and program size(total memory used, heap size). so
it may be different for different program(PLC). less scan
time means faster PLC action. scan time is mostly in mili
seconds, from 2ms onwords.

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