Knowledge base Automation Systems Programmable Logic Controllers (PLC /C Series)

Are There Comparison Instructions That Can Be Used As The Input Condition For Other Instructions In A Ladder Program?

Modified on Sun, 11 May, 2025 at 10:39 PM

Introduction
In a CS/CJ-series PLC CPU Unit, compare instructions can be used as input conditions by using Symbol Comparison Instructions.

Symbol Comparison instructions come in the three forms, LD, AND, and OR.
The AND-type symbol comparison instruction can be used with the CVM1-V2 PLC and C200HX/HG/HE-Z PLC CPU Unit.
The C-series PLC CPU Units do not support Symbol Comparison Instructions.
Example

Comparison instruction ladder diagram

Comparison instruction ladder diagram

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