Siemens SIMATIC S7-1500 Manual page 38

Applications of the F-I/O module
5.4 Application: Connecting 2 loads in parallel per digital output, PM-switching mode
Note
With a parallel connection of two relays on one digital output (as shown above) the "wire
break" fault is only detected if the wire break disconnects both relays from P or M. This
diagnostics is not safety-related.
Note
You can connect several actuators per output.
If several actuators are connected to an output, the diagnostics of each actuator affects the
other ones.
This means:
• A wire break is only signaled when several actuators are affected.
• A single short-circuit affects multiple actuators.
Parameter assignment
Assign the following parameter for the corresponding channel group:
Table 5- 3
Parameter
Operating mode of the output
38
Parameter
PM-switching mode
Digital output module F-DQ 8x24VDC/2A PPM (6ES7526-2BF00-0AB0)
Manual, 01/2016, A5E03858037-AA