I'm curious..
I have an 1768-L43 Rockwell Controller that communicates via one of the ENBTs to an Intellicenter MCC. The MCC controls certain conveyors/elevators, but also use a 1769-OA8 module to manage a permissive hold/bypass for equipment ahead of the MCC controlled equipment. I was asked to put this in place because the equipment ahead of the conveyors involves 2 large gas fires dryers with 4 burner controllers each, and restarting that equipment for minor maintenance was very time consuming. Usually these are put into low-fire for short periods when maintenance is performed. Since the permissives for the dryers are handled through the 1769-OA8, is there a way to retain an output's status, if I chose to put the controller into "Program" mode to make major changes to the program? I have several drives I was wanting to add some links to in my program, but can only do while in "Program" mode.
I've Thought about maybe wiring the permissives through my NC connection on the relays in my cabinet, and then just having my program keep the relays energized during normal operation....the problem with that being that my fail state then would be a bypass, which is not what I want.
I have an 1768-L43 Rockwell Controller that communicates via one of the ENBTs to an Intellicenter MCC. The MCC controls certain conveyors/elevators, but also use a 1769-OA8 module to manage a permissive hold/bypass for equipment ahead of the MCC controlled equipment. I was asked to put this in place because the equipment ahead of the conveyors involves 2 large gas fires dryers with 4 burner controllers each, and restarting that equipment for minor maintenance was very time consuming. Usually these are put into low-fire for short periods when maintenance is performed. Since the permissives for the dryers are handled through the 1769-OA8, is there a way to retain an output's status, if I chose to put the controller into "Program" mode to make major changes to the program? I have several drives I was wanting to add some links to in my program, but can only do while in "Program" mode.
I've Thought about maybe wiring the permissives through my NC connection on the relays in my cabinet, and then just having my program keep the relays energized during normal operation....the problem with that being that my fail state then would be a bypass, which is not what I want.