Westermo ID-90 - Manual (Page 10)

10 6607-2204
Alarm inputs
The four alarm inputs are accessed through screw terminals, the alarm inputs are opto-iso-
lated from all other parts of the ID-90. The alarm inputs need an external supply voltage of
10–60V DC to be operated. The supply is connected between the alarm input common and
the four inputs via making or breaking contacts. The inputs is not polarity sensitive but all
inputs must use the same common. The alarm inputs can use any mix of making and break-
ing contacts as the alarm trigger condition is programmable through AT-commands.
Example 1
Alarm through relay contacts.
Example 2
Alarm from a PLC with open collector.
110-240 VDC
95-240 VAC
110-240 VDC
95-240 VAC
10–60V DC
10–60V DC