accidentalengineer
Member
I am new to RIO addressing. The system that I am working on has a SLC 5/05 reading data from a 1746-NI8 (8 input analog card) that is located in a remote rack. A 1747-SN is used to read and write to the remote rack. (While I have had to do similar things to a PLC-5 system with an analog input card in the local rack, my memory is fuzzy and the RIO adds another level of difficulty.) To make matters more difficult the programmer did not use BTR and BTW instructions to communicate with the analog card and instead uses COP and MOV instructions, while making full use of M files. What is the advantage of this?
My problem may not be a problem at all. The current system only uses the first 4 analog inputs of the card and I simply want to verify that all 8 inputs are properly configured and being read. The fact that a COP instruction is used to move 8 words from M1:1.100 to N101:40 gives me suspicion that all 8 inputs are being read. I also know that N101:40 is the first analog input. Any educated guesses out there?
Forgive me for my ignorance, but I have a limited amount of time to figure this out.
My problem may not be a problem at all. The current system only uses the first 4 analog inputs of the card and I simply want to verify that all 8 inputs are properly configured and being read. The fact that a COP instruction is used to move 8 words from M1:1.100 to N101:40 gives me suspicion that all 8 inputs are being read. I also know that N101:40 is the first analog input. Any educated guesses out there?
Forgive me for my ignorance, but I have a limited amount of time to figure this out.