Rockwell Automation AADvance Controller Solutions Handbook - Manual (Page 84)

 

5-4 Document: 553631
(ICSTT-RM447J_EN_P) Issue: 09:
Solutions Handbook (AADvance Controller)
Triple Modular Redundant Channel Capacity
When you need input modules arranged in triple modular redundant formations, each
group of three modules will share a single triple termination assembly and occupies a
whole I/O base unit. A single controller supports 16 groups of three modules, so a
hypothetical controller using 16-channel input modules and needing no output channels
would have a capacity of 16 x 16 = 256 input channels.
A solution using 8-channel modules and needing dual output modules as well as
triplicated input modules would, with a ratio of 2:1 of inputs to outputs, provide 96
input channels and 48 output channels. These capacities are derived like this:
Input Channels
 12 groups of three 8-channel input modules occupy 12 base units and yield 12 x 8
= 96 input channels.
Output Channels
 6 pairs of output modules occupy the remaining 4 base units and yield 6 x 8 = 48
output channels.