FS-IOBUS-CPIO8 | Honeywell I/O BUS CPCHAS TO IOCHAS Module

The IO busses in Safety Manager provide a parallel communication link between the Control Processors inthe Controller chassis and the IO extender in the IO chassis.An IO bus connector set consists of two IO bus (flatcable) connectors (IO bus1.x and IO bus2.x) and twoconnectors for one IO bus terminator board (term IO bus.x).IO bus.3 in the above figure has a terminator while IO bus.4 is unused.Non-redundant IO requires one IO bus (controlled by Control Processor 1 and 2). Redundant IO requires apair of IO busses (one controlled by Control Processor 1, the other by Control Processor 2).A specific bus has to be used for non-redundant IO or redundant IO exclusively. Therefore, in SafetyManager with both redundant and non-redundant IO, at least three busses must be used: one pair that isconnected to all IO chassis for redundant IO, and one bus that is connected to all IO chassis for nonredundant IO.