S5-95F Rules for Failsafe Operation of an 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 Blanking Time at Output
Onboard digital output modules
<5 ms
External digital output modules
<7 ms
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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.
Table 18-6. Permissible Actuators for the S5-95F
Manufacturer Type
Rated Power of
Solenoids
Rated Operational
Current
SIEMENS 3TF2010-0BB4 3 W at 24 V DC 3×9 A at 400 V AC
SIEMENS 3TH8031-0B 6.2 W at 24 V DC 4×10 A at 230 V AC
SIEMENS 3TH3022-0B 6.2 W at 24 V DC 4×10 A at 230 V AC
SIEMENS 3TH2022-0BB4 3 W at 24 V DC 4×4 A at 230 V AC
Téléméchanique LP4-EC09 2.4 W at 24 V DC 4×6 A at 230 V AC
ABB KC22E 7 W at 24 V DC 4×4 A at 230 V AC
AEG SH04 1.2 W at 24 V DC 4×6 A at 440 V AC
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EWA 4NEB 812 6210-02
18-15
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