PLC input/output response lag phenomenon and its impact analysis

When the input end of the PLC controller input signal change PLC controller output to respond to the input changes over a period of time, this phenomenon is called PLC input/output response lag. Known from the analysis of the above, the length of the scan cycle mainly depends on the length of the program. The longer the scan cycle, the slower response speed. Because each scan cycle for an I/O only refresh, namely each PLC scan cycle to input and output status register only update once, so make the system input and output hysteresis, it to a certain extent, reduce the response speed of the system. The interference of industrial field is often impulse type, short, PLC controller input/output response lag, for general industrial control requirements, is completely allowed, also can rise to enhance system anti-jamming capability. However, for the strict control of time, faster system response speed requirements, shall take measures to reduce the negative impact of the input/output lagging.
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