Using I/Os in S7–400H
13.4 Connecting redundant I/O to the PROFIBUS DP interface
S7-400H
System Manual, 03/2012, A5E00267695-11
203
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 13- 5 Analog input modules and encoders
Module
Redundant encoders
Non-redundant encoders
6ES7 431–7QH00–0AB0
X
X
6ES7 336–1HE00–0AB0
X
-
6ES7 331–7KF02–0AB0
X
X
6ES7 331–7NF00–0AB0
X
X
6ES7 331–7RD00–0AB0
X
X
Redundant analog output modules
You implement fault-tolerant control of a final controlling element by wiring two outputs of two
analog output modules in parallel (1-out-of-2 structure).
,
$QDORJRXWSXWPRGXOHV
$FWXDWRU
Figure 13-12 Fault-tolerant analog output modules in 1-out-of-2 configuration
The following applies to the wiring of analog output modules:
●
Wire the ground connections in a star structure to avoid output errors (limited common-
mode suppression of the analog output module).
Information on connecting with diodes
●
Suitable diodes are diodes with U
_r
>=200 V and I_
F
>= 1 A (e.g. types from the series
1N4003 ... 1N4007).
●
A separate load supply is advisable. There must be equipotential bonding between both
load supplies.
