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S5-95F
18.9
Requirements for Actuators for Failsafety Digital Output Modules
In RUN, the S5-95F tests the digital output modules once every hour. To do so, it disables the
outputs for a brief period of time, the length of which is different for onboard I/Os than for external
I/Os (blanking time).
Table 18-5. Blanking Times for Testing Digital Output Modules
I/Os Tested by the S5-95F
Onboard digital output modules
External digital output modules
High-speed actuators (such as quick-acting valves) may drop out during the test. If your process
cannot tolerate this, choose one of the following three options:
•
Use actuators with sufficient lag
•
Call the DQ test in DB252 at least once an hour at a non-critical instant
•
Wire the actuators to diodes and/or RC networks
Using Actuators with Sufficient Lag
The table below lists a selection of pre-tested coupling relays which do not drop off during the DQ
test.
Manufacturer
SIEMENS
SIEMENS
SIEMENS
SIEMENS
Téléméchanique
ABB
AEG
EWA 4NEB 812 6210-02
Table 18-6. Permissible Actuators for the S5-95F
Type
3TF2010-0BB4
3TH8031-0B
3TH3022-0B
3TH2022-0BB4
LP4-EC09
KC22E
SH04
Rules for Failsafe Operation of an S5-95F
Blanking Time at Output
<
<
Rated Power of
Solenoids
3 W at 24 V DC
6.2 W at 24 V DC
6.2 W at 24 V DC
3 W at 24 V DC
2.4 W at 24 V DC
7 W at 24 V DC
1.2 W at 24 V DC
5 ms
7 ms
Rated Operational
Current
3×9 A at 400 V AC
4×10 A at 230 V AC
4×10 A at 230 V AC
4×4 A at 230 V AC
4×6 A at 230 V AC
4×4 A at 230 V AC
4×6 A at 440 V AC
18-15
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