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Connecting an External Alarm System
Connector for an External Alarm System
The D9040 Encoder is equipped with a connector for alarm relay outputs for remote
alarm signaling.
The Alarm output connector is a 9-pin Sub-D female connector. The following
drawing shows the connector and the pin allocation table for the Alarm output
connector.
Connector
9
1. Connect the cable from the external alarm system to the alarm connector.
Example, Alarm Relays
The following figure shows an example of how the alarm relays work.
For example, for an A-alarm under normal operational conditions (no alarm), pin 6
is closed, that is connected to pin 2 and pin 1 is open. However, should an alarm
condition occur pin 6 is open and pin 1 is closed, that is connected to pin 2. This
means that the A-alarm is active and the A-alarm LED lights on the front panel.
Note: The A-alarm relay is always activated when the power is off or the D9040
Encoder is booting, whereas the other alarm relays maintain their status.
For example, if a B-alarm relay is inactive when the power is switched off, it stays
inactive. However, if it is active when the power is switched off, it stays active.
For information about the maximum relay load, see Alarm Interface, page A-18.
3-14
Relay
Function
name
1
A
A-Alarm
B
B-Alarm
C
C-Alarm
6 Normally Closed (Inactive)
2 Common
1 Normally Open (Active)
Installation
Normally
Common
closed pin
pin
6
2
7
8
4
5
02-085
Normally
open pin
1
3
9
4020024 Rev C
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