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PLC Instruction Help

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Hello, I'm converting an old Moeller plc program and I need help with the "JI" and "J" instructions. I think they are jump instructions but what is the difference if they really are? Please find the picture below. Thank you.

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Hi, I am not very sure, but may be "I" stands for immediate. It could be that first the jump is done & after returning back, the other memory bits are set or reset which are in parallel to JI. Gud Luk. Nil

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