51402797-200 | Honeywell | INTERFACE MODULE

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Both IO modules reside next to each other in the same IO chassis. On the backplane they are wired parallel. 

- In principle, when a fault is detected in an input channel, this channel is deactivated by its corresponding Control Processor. The correct value is obtained from the IO module connected to the other Control Processor via the redundant internal link before the application cycle is started. 

- In principle, when a fault is detected in an output channel, this channel is de-energized by the SMOD. The correct value is driven into the field by the other Control Processor, but not after both Control Processors have agreed on its value via the redundant internal link.

This Safety Manager architecture has a redundant Controller and redundant input and output (IO) modules (OR function outputs) combined with nonredundant input and output modules (see Figure 19 and Figure 20 below). This architecture can be applied up to and including SIL3

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