Siemens S7-300 Installation And Operating Manual page 168

Digital modules
8.7 SM 326; F-DO 10 x DC 24V/2A PP (6ES7326-2BF10-0AB0)
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 8-58
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 in a cross-circuit-proof manner (for example, as separate,
sheathed cables or in separate cable ducts).
Assignable parameters for application 5
Table 8- 23
Parameters
"Parameters" tab
Mode of operation
F_Monitoring_Time (ms)
Diagnostic interrupt
Fail-safe value
Maximum test period
Load voltage failure diagnostics
Activated
Diagnostics: Wire break
Activated light test
Max. time for light test (ms)
Max. read-back time for dark test
(ms)
Redundant switched
168
required).
Wiring scheme 2 actuators at digital output of SM 326; F-DO 10 x DC 24V/2A PP
WARNING
Parameters for application 5 of SM 326; F-DO 10 x DC 24V/2A PP
Range of values
Safety mode
10 ms to 10000 ms
Activated/deactivated
Switch to fail-safe value "0"
Keep last valid value
100 / 1000 s
Activated/deactivated
Activated
Activated/deactivated
Activated/deactivated
0.6 ms to 5 ms
0.6 ms to 400 ms
Deactivated
Installation and Operating Manual, 01/2010, A5E00085586-10
Type Effective
range
Static Module
Static Module
Static Module
Static Module
Static Module
Static Channel
group
Static Channel
Static Channel
Static Channel
Static Channel
Static Channel
Static Channel
Fail-safe signal modules