A plc ladder logic program consists of a number of rungs with each rung controlling an input11/29/2023 ![]() The status of these inputs can then be used in the ladder logic program code. Understanding Numbers – Video PLC Scan – Read InputsĪll of the physical PLC inputs are read at least once during each scan. PLC Training Series – Tutorial for Everyone – Video We will be looking at each of these steps in a little more detail as we discuss the PLC program cyclic scan. Read inputs, execute program, diagnostics, and communication, and update outputs. The simplest scan cycle of a PLC consists of 4 steps. Understanding how the program scan will help us in programming and troubleshooting the PLC. This translates from 0.01 to 0.0001 seconds per PLC scan. Typical scan times range from 10 milliseconds to 10 microseconds. ![]() The time that it takes to complete one scan is called Scan Time. Programmable logic controllers (PLC) use a cyclic scan.
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