Connecting A Failsafe Digital Input - Siemens SINAMICS G120D Operating Instructions Manual

Appendix
A.3 Connecting a failsafe digital input
A.3

Connecting a failsafe digital input

The following examples show the interconnection of a failsafe digital input corresponding to
PL d according to EN 13849-1 and SIL2 according to IEC61508. You can find additional examples
and information in the "Safety Integrated" function manual.
Special requirements placed on EMC-compliant installation
Use shielded signal cables. Connect the shield at both conductor ends.
In order to connect two or more converter terminals, use the shortest possible jumpers directly
at the terminals themselves.
The examples comply with PL d according to EN 13849‑1 and SIL2 according to IEC 61508 for the
case that all components are installed within one control cabinet.
Figure A-6
You may connect emergency stop control devices in series because it is not possible for these
devices to fail and be actuated at the same time.
Figure A-7
According to IEC 62061 (SIL) and ISO 13849‑1 (PL), position switches of protective doors may
also connected in series.
Exception: If several protective doors are regularly opened at the same time, it is not possible for
faults to be detected, which means that the position switches must not be connected in series.
You can find additional connection options in the "Safety Integrated" Function Manual:
358
Connecting a sensor, e.g. Emergency Stop mushroom push-button or limit switch
Connecting electromechanical sensors in series
Overview of the manuals (Page 361)
Converter with the control units CU240D-2
Operating Instructions, 10/2020, FW V4.7 SP13, A5E34262100B AH