Need Help for A/B SLC 500 - troubleshooting tips
Need Help for A/B SLC 500 - troubleshooting tips
(OP)
I have an SLC500 with a 1746 analog controller..I'm using it to control a safety circiut by measuring 4-20 DC Ma from both a RTD and a pressure transducer with points from an enthapy curve plotted (Rockwell software) to reflect the safe zone for vaporization of C3H8 (propane)....This programming was done by others and now I have to verify the integrity og the programming..((i.e. How can I force inputs (by plugging in numbers? where ?) to test the ladder software ?)...Exactly: The inputs are N7:4 and N7:10 with the card in the #2 slot....This will also help me to bench test systems without transmitters installed.....Any help would be much appreciated...Lee





RE: Need Help for A/B SLC 500 - troubleshooting tips
Another way would be to put an AFI in the rung (a BTR block?) that reads the card and puts the value into N7:4 or N7:10, then you can change N7:4 or N7:10 directly, however, no other inputs on that card will be valid while the AFI is in place.
I would caution you to thoroughly check the program for multiple uses of those variables, or to have the propane system properly secured so that no unexpected actions take place while testing.
RE: Need Help for A/B SLC 500 - troubleshooting tips