ASB question

[Guest theplcguy]

I am trying to find information on what happens when a PLC-5 with several remote I/O racks has two of its ASB cards swapped (both with valid addresses - i.e. swapping cards in racks 3 & 4). It is a fault mode that I need to know about for a safety system but cannot seem to find any info anywhere??? Can anyone help?

[steve708 0]

Use one input on each rack to indicate that power is on to the inputs, say I:30/0 and I:40/0. In Rack 3 wire input I:30/1 directly to input power, and in Rack 4 wire I:40/2 the same way. Make sure that inputs I:30/2 and I:40/1 are always off. Then, XIC I:30/0 XIC I:30/2 = FAULT XIC I:40/0 XIC I:40/1 = FAULT