Digital Output - Siemens SIMATIC PCS 7 Configuration

2 Configuring and wiring
2.3 Redundant connections of the distributed I/O
2.3.2

Digital output

Controlling the final element control
The actuator is connected to two redundant SM322; DO 16 x DC 24 V / 0.5 A
(1 of 2 structure). Depending on the type of digital output modules, additional
diodes must be used in redundant mode.
Note
You can find the overview about which digital output modules you have to
interconnect via external diodes in table 8-4 of the manual "S7-400H Automation
System, High-availability Systems".
Figure 2–7
With external diodes
The digital output module with channel-granular functionality
(6ES7 322-8BH01-0AB0) is interconnected without external diodes.
Note
The digital output modules must be connected to a common load voltage supply.
Configuration of Redundant I/O Modules
Entry-ID: 28430682, V2.0,
Actuator
03/2015
Diodes integrated into the module
22