Application 3: Safety Mode 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

6.4 Application 3: Safety mode SIL3/Cat.4/PLe
Assigning inputs to each other
Digital input module F-DI 16x24VDC HA has 16 fail-safe inputs DI
combine two of these inputs in pairs to form one input.
The following inputs can be combined in pairs:
• DI
• DI
• DI
• DI
• DI
• DI
• DI
• DI
The process signals are read from channels DI
Wiring
You perform the wiring on the appropriate terminal block. You can find additional information
on this in section "Pin assignment of the F-DI 16x24VDC HA I/O module (Page 15)".
Sensor supply
The sensor must be supplied internally by at least one channel for application 3.1.
The sensor can be supplied internally or externally for application 3.2.
Requirements for applications in machine 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 sensors are wired as shown in the sections Application 3.1 (SIL3/Cat.4/PLe) (Page 47)
or Application 3.2 (SIL3/Cat.4/PLe) (Page 48). 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
and DI
0 8
and DI
1 9
and DI
2 10
and DI
3 11
and DI
4 12
and DI
5 13
and DI
6 14
and DI
7 15
to DI
0
,DI ,DI , DI , DI , DI , DI
0 1 2 3 4 5
Equipment Manual, 08/2021, A5E45647528-AD
(SIL3). You can
15
and DI .
6 7
F-DI 16x24VDC HA