90 Rockwell Automation Publication ICSTT-RM447M-EN-P - July 2019
Chapter 5 AADvance Scalability
Figure 24 - Simplex I/O Modules
Dual I/O Channel Capacity
When you need I/O modules arranged in dual redundant formations, each
pair of modules shares a dual termination assembly and occupies two-thirds of
an I/O base unit. The termination assemblies can bridge adjacent I/O base
units, so two base units will hold three pairs of dual redundant module
configurations, while three base units will hold four pairs. Arrange base units in
groups of two or four to optimize capacity for dual redundant modules.
If you assemble base units in groups of two or four, a single controller supports
24 pairs of I/O modules. The capacity using for example eight pairs of 16-
channel input modules and sixteen pairs of output modules is 256 I/O
channels (8 x 16 = 128, 16 x 8 = 128).
The capacity using 8-channel modules in dual configurations (24 pairs) is 24 ×
8 = 192 I/O channels. This can, for example, be 64 digital inputs, 64 analogue
inputs and 64 digital outputs, or any combination of these values with a
granularity of eight, the capacity of one I/O module.
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