SIMOCODE pro - Fail-Safe Digital Modules
Manual, 11/2017, NEB631679702000/RS-AA/002
59
Introduction
Working with the typical circuit diagrams
The typical circuit diagrams are intended to help you generate your own circuit diagrams for
different applications. They have a modular structure and are divided into recommendations
for the sensor circuit (DM-F Local fail-safe digital module only) and for the actuator circuit,
including the feedback circuit for monitoring the actuators.
The examples are designed for various safety requirements in accordance with
IEC 61508/62061 and EN ISO 13849-1, taking into account the most frequently used motor
control functions such as direct starter, reversing starter, star-delta starter, etc.
The sensor circuit is the part of the circuit that describes the possible options for connecting
emergency stop control devices or fail-safe digital output signals to the DM-F Local fail-safe
digital module.
The actuator circuit is the part of the circuit that is required to control the contactors used for
safety-related tripping.
The feedback circuit is used to monitor the controlled actuators (e.g. contactors) by means of
positively driven NC contacts connected in series. The feedback circuit must be closed in
order to activate the actuator circuit.
Note
The maximum safety integrity level (SIL) or performance level (PL) that c
an be achieved in
practice also depends on the sensors and actuators that are used.
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