190D-AFNCB2  A-B  Processor module

You configure complementary I/O by assigning an I/O rack number of one I/O chassis (primary) to another I/O chassis (complementary), complementing modules I/O group for I/O group. The I/O modules in the complementary chassis perform the opposite function of the corresponding modules in the primary chassis. The PLC-5/15 and -5/25 processors operating as a remote I/O scanner support complementary I/O. Use these guidelines when you configure your remote system for complementary I/O: Assign the complementary I/O rack number to a chassis of any size. Do not place an input module opposite an input module; they will use the same bits in the input image table. You can place an output module opposite another output module; they use the same bits in the output image table. This allows you to use one output module to control a machine and use the other module with the same address to control an annunciator panel to display the machine condition. We do not, however, recommend this placement of modules for redundant I/O. You cannot configure the PLC-5 processor-resident local chassis with complementary I/O. The PLC-5 processor communicates with each processor-resident local I/O chassis as if it were a full I/O rack (eight I/O groups). Thus, if the processor-resident local chassis contains four I/O groups, the remaining four I/O groups of that I/O rack are unused; you cannot assign them to another chassis. You cannot use complementary I/O with a chassis that uses a combination of 32-point I/O modules and 1-slot addressing or 16-point I/O modules with 2-slot addressing. Important: For the PLC-5/15 and -5/25 processors, an autoconfigure is performed before the scanner begins communicating with the adapter.

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