9
Installation • Shelf Addressing
To distinguish Net Guardian Expansion Shelf 1 (and Shelves 2 and 3 if applicable), a DIP switch address setting is
used. The DIP switches use binary settings and are addressed as 1, 2, and 3 respectively. To verify the shelf
address, push and hold the ACK button on the front panel. The LEDs will indicate the shelf address (i.e. either 1,
2, or 3).
2.3.5.1 Net Guardian Expansion Addressing
Net Guardian Expansion
DIP switch position
Shelf 1
Shelf 2 (if applicable)
Shelf 3 (if applicable)
Tbl. 2.3.5.1 -
Net Guardian Expansion shelf addressing.
Fig. 2.3.5.1 -
Shelf addressing DIP switch close-up.
On (down)
1
2
3
(Not used)
Off (up)
Off (up)
Off (up)
On (down)
Off (up)
On (down)
On (down)
Off (up)
4
(Not used)
Off (up)
Off (up)
Off (up)
ON
OFF
Note: If you only have one Net Guardian Expansion, it must be shelf 1. If a second Net Guardian Expansion is
used, it must be shelf 2, etc.
2.3.6 Discrete I/O Lines (alarms)
Discrete alarm points connected to the Net Guardian Expansion units are essentially single-lead signals referenced
to ground. The B-side of each alarm point is internally wired to ground, so either a single wire bringing a contact
to ground or a dry closure with the second lead connected to the B-side will be sensed as an alarm signal.
Tbl. 2.3.6 -
Net Guardian Expansion discrete alarm points.
Discretes 1-24
B
A
B
A
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
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
Discretes 25-48
38
ALM 25
ALM 26
ALM 27
ALM 28
ALM 29
ALM 30
ALM 31
ALM 32
ALM 33
ALM 34
ALM 35
ALM 36
B
A
B
A
1
2
3
4
5
6
7
8
9
10
11
12
26
27
28
29
30
31
32
33
34
35
36
37
ALM 37
ALM 38
ALM 39
ALM 40
ALM 43
ALM 44
ALM 45
ALM 46
ALM 47
ALM 48
13
14
15
16
17
18
43
19
20
21
22
23
24
39
40
41
42
44
45
46
47
48
49
ALM 41
ALM 42
Summary of Contents for D-PC-293-10A
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