Rockwell Automation T7491 ICS Regent+Plus Mixed I/O Modules - Manual (Page 3)

Multiplexed I/O Module (T7491)
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Figure 2. Block Diagram of Multiplexed I/O Module.
The Voter, FPGA and triple buffers provide an interface to the
triplicated I/O Safetybus. The Mux I/O module receives
configuration data over the I/O Safetybus from the processor
modules. This information defines the types of Multiplexed
I/O Unit equipment connected to the Mux I/O module. The
information is stored in the module’s dual ported RAM
memory.
The RAM memory is arranged into four blocks. One block is
used to download the Mux I/O equipment configuration. The
second block is used for reporting fault conditions. A third
block is used for writing output data, and the fourth block is
used for reading input data. The on-board microprocessor uses
this information to read and write I/O data via the two serial
ports.
Testing and Diagnostics
Comprehensive testing and diagnostics are used to determine
correct operation to the Mux I/O Module and connected MIU
equipment.