855E-B24SA3 A-B  Central unit

The PLC-5 processor in adapter mode acts as a remote station to the supervisory processor. The adapter-mode PLC-5 processor can monitor and control its processor-resident local I/O while communicating with the supervisory processor via a remote I/O link. The supervisory processor communicates with the PLC-5/12, -5/15, or -5/25 adapter with either eight or four I/O image table words. A PLC-5 processor transfers I/O data and status data using discrete transfers and block transfers. You can also use block-transfer instructions to communicate information between a supervisory processor and an adapter-mode processor. The maximum capacity per block transfer is 64 words

Master/Expander I/O Modules Some I/O modules (called “masters”) communicate with their expanders over the backplane. These master/expander combinations either: can time-share the backplane, or cannot time-share the backplane For masters that can time-share the backplane, you can use two masters in the same chassis. For a master/expander combination that cannot time-share the backplane, you cannot put another master/expander combination in the same I/O chassis. Example: The stepper-controller module (cat. no. 1771-M1, part of a 1771-QA assembly) and the servo-controller module (cat. no. 1771-M3, part of a 1771-QC assembly) always act as masters and cannot time-share the backplane. Therefore, you cannot put a second master module in the same chassis with either of these modules. Table 2.C summarizes the compatibility of master modules within a single I/O chassis.

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