Scan (Sweep) Time Calculation
Scan or Sweep time is the time it takes the PLC CPU to perform all of its tasks one time. Scan
time contribution is the amount of time added to the PLC scan by the software and hardware
components of the system. For systems that may be time-sensitive, this factor should be made part
of the design specification. To help avoid timing issues, the theoretical scan time should be
calculated so that appropriate solutions can be designed into the system up-front.
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