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We are trying to establish a standard for Plant Control(PLC) system wiring numbering. Two methods have been proposed and we have a problem to pick up a right one.
Method 1: Start a numbering at PLC TB (our PLC TB are numbered according to RACK:SLOT:SIGNAL pattern, so a terminal, belonging to RACK 1, Slot 5 Signal 14 would be numbered as 1514) and keep the number unchanged all the way via various junction boxes up to the field instrument terminals.
Method 2: Start a numbering at PLC TB and change the wire's number (according to terminal's number) each time the wire entering/exiting a terminal up to the field instrument terminal. This way both ends of the same wire will have different numbers.
What method would you recommend ? (one of above or any other "good practice").
Thank you,
Victor Zaltsman
Method 1: Start a numbering at PLC TB (our PLC TB are numbered according to RACK:SLOT:SIGNAL pattern, so a terminal, belonging to RACK 1, Slot 5 Signal 14 would be numbered as 1514) and keep the number unchanged all the way via various junction boxes up to the field instrument terminals.
Method 2: Start a numbering at PLC TB and change the wire's number (according to terminal's number) each time the wire entering/exiting a terminal up to the field instrument terminal. This way both ends of the same wire will have different numbers.
What method would you recommend ? (one of above or any other "good practice").
Thank you,
Victor Zaltsman