Connection examples for redundant I/Os
E.12 SM 421; DI 32 x DC 24 V, 6ES7 421–1BL00–0AB0
S7-400H
472 System Manual, 03/2012, A5E00267695-11
E.12 SM 421; DI 32 x DC 24 V, 6ES7 421–1BL00–0AB0
The diagram below shows the connection of two redundant encoders to two
SM 421; D1 32 x 24 V. The encoders are connected to channel 0.
R
R
R
R
R
R
9
Figure E-12 Example of an interconnection with SM 421; DI 32 x 24 V
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