Application 3: Safety Mode Sil3/Cat.4/Ple - Siemens SIMATIC ET 200SP Equipment Manual

Applications of the F-I/O module

5.4 Application 3: Safety mode SIL3/Cat.4/PLe

5.4 Application 3: Safety mode SIL3/Cat.4/PLe
Assigning inputs to each other
The digital input module F-DI 8×24VDC HF has 8 fail-safe inputs, DI
combine two of these inputs each to one input.
You can combine the following inputs:
• DI
• DI
• DI
• DI
The process signals are provided by channels DI
Wiring
The wiring is carried out on the matching BaseUnit.
Sensor supply
For application 3.1, the sensor supply must be set up for at least one channel internally with
activated short-circuit test.
The sensor can be supplied internally or externally for application 3.2.
Requirements for applications in machinery protection with Cat.4
Both conditions must be met for applications in machine protection with Cat.4:
• The wiring between sensors and automation system and between automation system and
actuators must be designed to state-of-the-art engineering and standards to prevent
short-circuits.
• The actuators must be wired as seen in sections Application 3.1: Safety mode
SIL3/Cat.4/PLe (Page 47) or Application 3.2: Safety mode SIL3/Cat.4/PLe (Page 50). You
only need to detect one short-circuit because two faults are required to generate it. This
means both signal cables in short-circuit have an isolation fault. A multiple short-circuit
analysis is not required.
Procedures for locating all short-circuits are also permitted if single short-circuits are not
located. One of the two conditions must be met for this purpose:
• Short-circuits may not corrupt the read signals compared to the sensor signals.
• Short-circuits cause a corruption of the read signals compared to sensor signals in the
direction that ensures safety.
46
with DI
0 4
with DI
1 5
with DI
2 6
with DI
3 7
,DI ,DI and DI .
0 1 2 3
Digital input module F-DI 8x24VDC HF (6ES7136-6BA01-0CA0)
Equipment Manual, 10/2021, A5E50578307-AA
to DI (SIL3). You can
0 7