Application 3.2 (Sil3/Cat.4/Ple) - Siemens SIMATIC ET 200SP HA Equipment Manual

Applications of the F-I/O module
6.4 Application 3: Safety mode SIL3/Cat.4/PLe
Fault detection
The following table presents fault detection according to the sensor supply and the parameter
assignment for the short circuit test:
Table 6-7
Fault
Shorted within the channel pair, to other chan‐
nels or other sensor supplies
Shorted to L+ at DI
Shorted to M at DI
Discrepancy error
Shorted to L+ at UV
Shorted to M at UV
*) Fault detection only if signals are corrupted. That is, the read signal differs from the sensor signal
(discrepancy error). If there is no signal corruption with respect to the sensor signal, fault detection is not
possible and is not required from a safety standpoint.
**) If the input has a "1" signal and the short-circuit test is enabled.
6.4.2

Application 3.2 (SIL3/Cat.4/PLe)

Wiring diagram – connecting a non-equivalent sensor
For each process signal, an antivalent sensor is connected to two inputs of the F-I/O module
(1oo2 evaluation, antivalent).
Figure 6-10
You can also supply the sensor by means of an external sensor supply.
Figure 6-11
48
Fault detection depending on the sensor supply and short-circuit test
n
n
n
or defect
n
Non-equivalent sensor connected, internal sensor supply
Non-equivalent sensor connected, external sensor supply
Fault detection
Yes*
Yes* / Yes (on channel whose short-circuit test is ena‐
bled)
Yes*
Yes
Yes**
Yes, with "Internal" sensor supply
Equipment Manual, 08/2021, A5E45647528-AD
F-DI 16x24VDC HA