Application: Connection Of A Fail-Safe Digital Input To Each Digital Output - Siemens SIMATIC ET 200SP Equipment Manual

5.5 Application: Connection of a fail-safe digital input to each digital
output
Each of the 8 fail-safe digital outputs can be connected to a fail-safe digital input of the type
1, 2 or 3 in accordance with IEC61131-2.
In this application, the input delay of the fail-safe digital input must be set so that the light
test and the dark test of the fail-safe digital output do not impair the fail-safe digital input.
You can achieve SIL3/Cat.4/PLe with this circuit.
To achieve SIL3/Cat.4/PLe using this wiring, you must use a suitably qualified fail-safe digital
input, e.g. ET 200SP F-DI 8x24VDC HF.
Input without ground return
To achieve SIL3/Cat.4/PLe see section Installation of the ground line between the power
supply and the BaseUnit (Page 32).
If the fail-safe digital output module F-DQ 8x24VDC/0.5A PP HF and the fail-safe digital input
module are supplied by different power supply units, the grounds of the two power supply
units must be connected to each other.
Figure 5-4
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
Equipment Manual, 12/2022, A5E38578424-AB

5.5 Application: Connection of a fail-safe digital input to each digital output

WARNING
Wiring diagram of an output of the digital output module F-DQ 8x24VDC/0.5A PP HF with
an input of a fail-safe digital input module (without ground return).
Applications of the F-I/O module
39