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