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Table 2: Switching behavior of application diagnostic output Y1
State of enabling current paths
State of application diagnostic output Y1
Closed
0 V (NPN)
Open
24 V (PNP)
Application diagnostic output Y2
Application diagnostic output Y2 outputs the “Reset required” signal with a frequency of
1 Hz, e.g. for the connection of a signal lamp.
4.4.3
Restart interlock
Important information
DANGER
Hazard due to unexpected starting of the machine
Death or severe injury
b
If you connect the safety relay to an emergency stop pushbutton, you must use the
restart interlock.
Restart interlock
A reset pushbutton must be connected to allow the restart interlock to be used. The
reset pushbutton must be attached outside of the hazardous area. It must not be possi‐
ble to access the reset pushbutton from inside the hazardous area. The entire haz‐
ardous area must be highly visible for all operators from the reset pushbutton.
Further topics
•
4.4.4
External device monitoring (EDM)
External device monitoring (EDM)
With static external device monitoring, the safety relay tests whether the controlled
actuators (contactors) have dropped out when the device is switched on.
Further topics
•
4
PROJECT PLANNING
14
O P E R A T I N G I N S T R U C T I O N S | ReLy EMSS3
8023937/2019-10-11 | SICK
Subject to change without notice