1794-L35E  A-B  Control Unit

32-Point I/O Modules To use 32-point I/O modules with 1-slot addressing, you must install, as a pair, an input module and an output module in two adjacent slots (even/odd pair) of the I/O chassis, beginning with I/O slot 0. If you cannot pair the modules in this way, one of the two slots of the pair must be empty. For example, if I/O slot 0 holds a 32-point input module, I/O slot 1 must hold an 8-, 16-, or 32-point output module (or a module using the backplane for power only); otherwise the slot must be empty Using 1/2Slot Addressing When you select 1/2-slot addressing, the processor addresses one-half of an I/O module slot as one I/O group. Each physical slot in the chassis corresponds to two input and two output image-table words. The type (unidirectional or bidirectional) and density of the module that you install determines the number of bits that are used in each word. 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.

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