14
24 Vdc
24 Vdc
24 Vdc
OSSD1
NC
NC
NO
NO
OSSD2
EDM
MPCE
ESPE
8. Manual or automatic restart
9. External Device Monitoring (EDM)
Depending on the initial risk analysis of the machine, a start or restart interlock can be a safety requirement of the
control system. It prevents an automatic restart of the machine during a dangerous part of the operating cycle after
activation of the sensing device, or when the electrical supply of the sensor is switched on or restored after interruption.
This interlock can be implemented by a manual restart of the safety controller or by the light curtain itself.
EDM is a function that allows the electro-sensitive protective equipment (ESPE) to monitor the state of control devices
(i.e. contactors, actuators) that are driven by its outputs.
This function can be achieved by the safety controller or directly by the light curtain.
7. Response time
The response time is the maximum time occurring between the detection of the test object in the detection zone and
the activation of the light curtain’s outputs.
It is a safety relevant parameter, and its value must be taken in account when calculating the position in which the
safety sensor will be placed in relation to the dangerous area.
SELECTION GUIDE
Fig. 6 External Device Monitoring wiring diagram
