CX-PROTOCOL(Primary Expression (yN+x))

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Good day everyone!


I have some question relate with above subject. While i try make protocol for the CJ2M PLC. 

i found out "Primary Expression (yN+x)" function but i cannt understand what`s this for. even i tried to find in the reference manual. i can not. 

you can find it "Message Editor" -> "Message Variable" -> "Variable"

sorry i tried to upload picture many times but it kept showing failed to upload. 


hope so i could find the answer. thank you!

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