8
5.6
Alarm and Control Relay Connections
The NetGuardian-16S's discrete alarm inputs and control relay outputs are connected through the two 50-pin
connectors labeled "Discretes 1–24" and "Discretes 25–32/Relays 1–8" on the back panel. (See Figure 5.6.1.)
5.6.1 Alarm and Control Relay Connector Pinout Table
Discretes 1–25
RTN ALM
ALM 1
1
26
ALM 2
2
27
ALM 3
3
28
ALM 4
4
29
ALM 5
5
30
ALM 6
6
31
ALM 7
7
32
ALM 8
8
33
ALM 9
9
34
ALM 10
10
35
ALM 11
11
36
ALM 12
12
37
Table 5.6.1.A, above, shows the pinouts for the 50-pin connectors "Discretes 1–24" and "Discretes 25–32/Relays
1–8."
Note that the NetGuardian-16S's control relays can be set for either Normally Open or Normally Closed
operation. By factory default, all control relays are set to Normally Open. You can reset all relays for Normally
Closed operation at the hardware level by resetting a jumper on the NetGuardian-16S circuit board.
For instructions on resetting control relays for Normally Closed operation, see Section 5.10, "Jumper Options —
Switch Control Relays from Normally Open to Normally Closed."
Fig. 5.6.1. Alarm and control relay connectors
RTN ALM
ALM 13
13
38
ALM 14
14
39
ALM 15
15
40
ALM 16
16
41
ALM 17
17
42
ALM 18
18
43
ALM 19
19
44
ALM 20
20
45
ALM 21
21
46
ALM 22
22
47
ALM 23
23
48
ALM 24
24
49
GND
25
50
Table 5.6.1.A. Alarm and control relay connector pinout
Discretes 25–32
RTN ALM
ALM 25
1
26
ALM 26
2
27
ALM 27
3
28
ALM 28
4
29
ALM 29
5
30
ALM 30
6
31
ALM 31
7
32
ALM 32
8
33
Control Relays 1–8
NO/NC CO
CTRL 1
9
34
CTRL 2
10
35
CTRL 3
11
36
CTRL 4
12
37
CTRL 5
13
38
CTRL 6
14
39
CTRL 7
15
40
CTRL 8
16
41
FUSE
17
42
GND
25
50
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