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Although the working principles are in accordance with each other for the traditional ladder diagram and the PLC
ladder diagram, PLC is indeed utilizing the microcomputer chip (MCU) to simulate the motion of the traditional ladder
diagram, which is to use the scan method to look over one by one the conditions of all input devices and output coils,
and afterwards, with the conditions in consideration, to calculate and generate the same output result as that of the
traditional ladder diagram based on the logics of the combination status of the ladder diagram. However, since that
there is only one MCU, the only way to examine the circuits is to look it over one after another within the ladder
diagram program, then calculate the output result in compliance with the program and the input/output status, and
finally, output the results to the external interface; thereafter, start over with the readout of the input status, the
calculation, output, and repeatedly go over the above-mentioned motions again; the time needed to complete the
whole set of cyclic motion is called one Scan Time. The scan time will become longer in accordance with the
increment of the program. With this scan time, it will incur repeated input detections, and thus, result in delay in the
output responses; and the longer the delay time, the greater the error towards the control, and what’s worse, is that
the condition might be unqualified for the control requests. By then, PLC (with faster Scan Time) would be chosen to
do the job; the scan speed is thus an essential specification to PLC. Thanks to the advanced technique of ASIC (IC
with specific functions) within the microcomputer, PLC of the present has made greater progress in the scan speed,
and what follows is the scanning chart of the PLC Ladder Diagram Program.