Why are there multiple cards within an Allen-Bradley I/O connection?
• You use a different I/O connection for each PLC that PICS communicates with. • Within that I/O connection, you sometimes need to use more than one card because the PLC has multiple I/O channels and will not let you configure all the racks the PLC supports on just one channel. An example would be a PLC-3 where the PLC supports up to 32 remote racks and there are four I/O channels. The PLC will not let you configure more than 16 racks on any one channel, so you need a separate card for each channel. This is also true for some models of PLC-5. Modicon 800 Series/Quantum I/O Driver I want to set up my I/O connection for the Modicon S/908 Remote I/O. I want to talk over Quantum I/O but when I try to select it with either real or virtual drops settings the Edit and Delete keys are grayed out. I cannot configure the drops. When you are simulating Quantum I/O, once you have done the configuration in the PLC and start to simulate PICS loads in the appropriate drop configurations from the PLC.
