Siemens SIMATIC PCS 7 Configuration page 20

2 Configuring and wiring
2.3 Redundant connections of the distributed I/O
Connection and schematic circuit diagram of the SM 321; DI 16 x DC 24 V
The following picture shows the schematic circuit diagram of the digital input
module with channel-granular functionality (6ES7 321-7BH01-0AB0).
Figure 2–6
Table 2–1
Digit
1
2
3
4
Configuration of Redundant I/O Modules
Entry-ID: 28430682, V2.0,
Channel number
Status displays – green
Fault display – red
Encoder supply VS – green
Backplane bus interface
Open-circuit detection
03/2015
Description
20