Signal description
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3.1 Motion signals
The integrated logic of the PSR-M-EM safety modules does not place any special require-
ments on the connected sensor electronics. As a result, it is possible, in principle, to connect
standard sensors (rotary transducers, linear measuring systems or proximity switches) to
the safety relay module.
However, for the safety assessment of the overall arrangement and the associated mea-
sures to determine the safety integrity achieved, the sensor manufacturer's specifications
must be consulted.
If using a single sensor, take measures to avoid mechanically-caused errors.
– Implement at least one form of error prevention for the mechanical actuation chain.
– Please also observe the relevant guidelines of standards EN ISO 13849-1 and -2 as
well as EN ISO 61800-5-2, for example.
Taking the above restrictions into consideration, the following safety functions can be imple-
mented in accordance with EN ISO 61800-5-2:
– STO (safe torque off)
– SLS (safe limited speed)
– SSM (safe speed monitoring)
– SSR (safe speed range)
– SOS (safe operation stop)
– SDI (safe direction)
The maximum achievable safety integrity depends on the connected sensors, the actuators
(switching elements), the device parameterization, and the corresponding requirements for
the safety function to be implemented.
Configuration of proximity
switches
If the monitored axis of a PSR-M module is designed for measurement using two proximity
switches, a simultaneous open circuit of both sensor signals (PROXIMITY 1 +
PROXIMITY 2) must be ruled out in order to achieve PL e and SIL 3. Ensure forced dynamic
sampling of the signals within 24 hours for the timely detection of errors.
The proximity switches must be implemented so that at least one of the switches is always
active (“interleaved”). .
Figure 3-4 Implementation of two “interleaved” proximity switches
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