2094-PRS5 A-B  Operator unit

When assigning rack numbers, use the following guidelines: One I/O rack number is eight I/O groups, regardless of the addressing mode that you select. You can assign from one to four racks in your processor-resident local chassis (128 inputs and 128 outputs) depending on the chassis size and addressing mode. You cannot split a processor-resident local I/O rack over two or more chassis or assign unused processor-resident local I/O groups to remote I/O racks. The default address of the processor-resident local rack is 0. You can change the default to 1 by setting bit 2 in the processor control word (S:26) on the processor configuration screen; you must also change the mode of the processor from run to program to run. An extended-local I/O and a remote I/O chassis cannot be addressed by the same I/O rack number. For example, if an 8-slot extended-local I/O chassis is configured as I/O groups 0-3 of I/O rack 2, an 8-slot remote I/O chassis cannot be configured as I/O groups 4-7 of I/O rack 2.

When assigning remote I/O rack numbers, use the following guidelines: Limit the number of remote I/O rack numbers to those that your PLC-5 processor can support. The PLC-5 processor and the 1771-ASB adapter module automatically allocate the next higher rack number(s) to the remaining I/O groups of the chassis. For example, if you select 1/2-slot addressing for your processor-resident local chassis and you are using a 16-slot (1771-A4B) chassis, the processor will address racks 0, 1, 2, and 3 in this chassis.

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