Table 10-5 Analog Input Modules And Encoders; Figure 10-10 Fault-Tolerant Analog Input Modules In 1-Out-Of-2 Structure With Two Encoders - Siemens SIMATIC S7-400H System Manual

Fault-tolerant systems
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Using I/Os in S7-400H
10.5 Connecting redundant I/Os
Redundant analog input modules with redundant encoders
With double-redundant encoders, it is better to use fail-safe analog input modules in a 1-out-of-2
structure:

Figure 10-10 Fault-tolerant analog input modules in 1-out-of-2 structure with two encoders

The use of redundant encoders also increases their availability.
A discrepancy analysis also detects external errors, except for the failure of a non-redundant
load voltage supply.
You will find connection examples in Appendix F.
The general comments made at the beginning of this documentation apply.
Redundant encoders <-> non-redundant encoders
The table below shows you which analog input modules you can operate in redundant mode
with redundant or non-redundant encoders:
Table 10-5
Module
6ES7 431–7QH00–0AB0
6ES7 336–1HE00–0AB0
6ES7 331–7KF02–0AB0
6ES7 331–7NF00–0AB0
6ES7 331–7RD00–0AB0
146
Analog input modules and encoders
Redundant encoders
X
X
X
X
X
Non-redundant encoders
X
-
X
X
X
System Manual, 09/2007, A5E00267695-03
S7-400H

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