Scan time is the time required for the PLC to complete one I/O scan plus the
execution cycle. This time depends on the number of input and output channels,
the length of the ladder instruction sets, and the speed of the processor. A typical
scan time is between 5 and 20 ms. As well as evaluating data, the PLC can
also generate accurate time delays, store and record data for future use, and produce
data in chart or graph form