Siemens SINUMERIK 840D sl Function Manual page 192

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Table of Contents

Connecting Sensors/Actuators

7.1 Safety–related input/output signals

High Feature

Actuator connection via fail–safe outputs, e.g. 400 V load circuit – P/M–switching

Example of connecting a sensor

2 safety–related inputs (to read–in through 2 channels via SGE) and 1 standard

test output (for the forced checking procedure) are required to connect a sensor in

a fail–safe fashion. The test output is fed from the power supply voltage of the

safety input module. For sensors with a self–test routine, the test output on the

input module is not required. For the 3–terminal connection concept we recom-

mend that sensors with non–equivalence contacts are used (NC contact/NO con-

tact). If a P or M short–circuit or broken cable at both signal cables, then a signal

state is obtained that is not logically permissible. This means, that a cross–circuit

fault can be detected by the non–equivalence concept without having to carry out

Cross–circuit fault detection in the input module is not required.

SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition

ET 200S PROFIsafe

Electronics output – M

Electronics output – P

monitoring of the load

using positively–driven

Sinamics s120