Siemens SIMATIC S5-95F - Connecting Actuators to Failsafe Digital Outputs

Installing and Connecting the Basic System S5-95F
Example: Indirect Connection of Actuators via Coupling Elements (Type L)
Connect the 24 V DC load voltage (L+ potential to terminal 1, L- potential to terminal 10).
Connect the coupling relays to the outputs selected (see Figure 4-13).
Please note, that some applications (e.g. special valves for burner controls) require the use of
diverse coupling relays. A list of tested coupling relays is contained in section 4.3.
Figure 4-13. Indirect Connection of an Actuator via Coupling
Elements
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DQ 32.2
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Actuator
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OUT
12× 24V DC
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IN
16× 24V DC
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OUT
12× 24V DC
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IN
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4.3 Connecting Actuators to Failsafe Digital Outputs
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 4-5. 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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4-16 EWA 4NEB 812 6210-02