chelton
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chelton's post in Communication Between 2 CP1H PLCs via CIF41 Using SEND/RECV Instruction was marked as the answer
@IO_Rack is correct. This is from W450 manual.
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chelton's post in CP1H String Difficulties was marked as the answer
That explains why the instruction behaves the way your describing. You should be monitoring the communication port enabled flag to check if the instruction is being used. Refer to manual W394 section 6-1.