Siemens S7-300 Installation And Operating Manual page 147

Connecting two actuators to one digital output
The fail-safe digital output is capable of switching two actuators. The following conditions
have to be met:
● Wire L+ and M of the actuators to 2L+ and 2M of the module (same reference potential
The actuators can be wired to any one of the 10 digital outputs. The figure below shows an
example of an output wiring. This circuit is compliant with SIL 3/Cat. 4/PLe.
Figure 8-46
It is no longer possible to shut down an actuator if a cross circuit has developed between
2L+ and DO. To prevent cross circuits between 2L+ and DO, you must route the cables
used to connect the actuators between the two signal groups (channels 0 - 4 and channels
5 - 9) in a cross-circuit-proof manner (for example, as separate, sheathed cables or in
separate cable ducts).
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
required).
Wiring scheme 2 actuators at digital output of SM 326; DO 10 x DC 24V/2A
WARNING
8.6 SM 326; DO 10 x DC 24V/2A (6ES7326-2BF01-0AB0)
Digital modules
147