CPM-a Port Types
218 7750 SR-a4 and SR-a8 Installation Guide
Refer to the 7750 SR OS Basic System Configuration Guide for more details about
configuring the alarm inputs.
Alarms Interface Port Pinouts
Table 111 describes the alarms interface port pinouts.
Table 111: Alarms Interface Port Pinouts
Pin Name Description
1 CRIT_ALARM_COM Common contact for Critical alarm relay.
2 CRIT_ALARM_NO Normally open contact will be connected to the common contact
during a Critical alarm state.
3 MJR_ALARM_NC Normally closed contact will be disconnected from the common
contact during a Major alarm state.
4 +24 VDC source 100 mA
referenced to chassis ground
Available as a source voltage for use with Alarm In 1-4.
5 ALARM_IN4_EXT_+ External alarm input 4 (external relay dry contact closure to pin 12).
6 ALARM_IN3_EXT_+ External alarm input 3 (external relay dry contact closure to pin 13).
7 ALARM_IN2_EXT_+ External alarm input 2 (external relay dry contact closure to pin 14).
8 ALARM_IN1_EXT_+ External alarm input 1 (external relay dry contact closure to pin 15).
9 CRIT_ALARM_NC Normally closed contact will be disconnected from the common
contact during a Critical alarm state.
10 MJR_ALARM_COM Common contact for Major alarm relay.
11 MJR_ALARM_NO Normally open contact will be connected to the common contact
during a Major alarm state.
12 ALARM_IN4_EXT_RTN External alarm input 4 (external relay dry contact closure from pin 5).
13 ALARM_IN3_EXT_RTN External alarm input 3 (external relay dry contact closure from pin 6).
14 ALARM_IN2_EXT_RTN External alarm input 2 (external relay dry
contact closure from pin 7).
15 ALARM_IN1_EXT_RTN External alarm input 1 (external relay dry
contact closure from pin 8).
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