Lantech IES-5216DF, User Manual

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electrically isolated from the housing.
Note: With single power supply of the mains voltage, the device will
report a power failure. You can disable this power fail event via web
browser.
Pin assignment of alarm relay
A break in contact is reported via the relay contact :

The failure of at least one of the two supply voltages.

The break link status of at least one switch port.
3.1.4 Fitting the device, grounding
Install the system in a dry and clean area to protect the switch to
get exposed with dirt.
Plug the connector to the power supply plug then turn on the power
supply.

Ground
The chassis is grounded via a separate ground nut (M3).
Use toothed locking washers for a good electrical connection.