Appendix
A.6 Application Examples
Converter with control units CU250D-2
360 Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
Connecting fail-safe digital inputs
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-8 Connecting a sensor, e.g. Emergency Stop mushroom push-button or limit switch
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-9 Connecting electromechanical sensors in series
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, see
Section: Manuals for your inverter (Page 371).
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