Control Information for the 1260-35A
The 1260-35A operates as a 4-wire MUX. Thus, when a channel is operated, 2 relays must be operated in
parallel. For each channel, when a bit of Control Register X is set (or cleared), the same bit of Control
Register X+6 must also be set (or cleared).
Each channel on this module is therefore controlled by setting or clearing two bits, one each in two different
Control Registers. Control Registers on the module operate 8 channels simultaneously. There are eight
control bits per Control Register. Setting the bit to a 1 closes the relay; setting the bit to a 0 opens the relay.
The table below shows the mapping between logical channels used to operate the relay module in message-
based mode and the bits within the Control Registers which may be used to operate the channel in register-
based mode.
Each Control Register is located 2 addresses from the previous Control Register. That is, each Control
Register is located at an odd address. This is shown in Table 2-2 of the 1260-01T manual. Control Register 0
is located at the “Base A24 Address” for the module. Consult the “Register-Based Operation” Section of
Chapter 2 of the 1260-01T manual for a description of calculating control register addresses
For example, when closing channel 13, both byte 1 and byte 7 must have bit 5 set.
Channel
Control Register
Control Bit
0
0 and 6
0
1
0 and 6
1
2
0 and 6
2
3
0 and 6
3
4
0 and 6
4
5
0 and 6
5
6
0 and 6
6
7
0 and 6
7
8
1 and 7
0
9
1 and 7
1
10
1 and 7
2
11
1 and 7
3
12
1 and 7
4
13
1 and 7
5
14
1 and 7
6
15
1 and 7
7
16
2 and 8
0
17
2 and 8
1
18
2 and 8
2
19
2 and 8
3
20
2 and 8
4
21
2 and 8
5
22
2 and 8
6
23
2 and 8
7
24
3 and 9
0
25
3 and 9
1
26
3 and 9
2
27
3 and 9
3
28
3 and 9
4
29
3 and 9
5
30
3 and 9
6
31
3 and 9
7
32
4 and 10
0
33
4 and 10
1
34
4 and 10
2
35
4 and 10
3
36
4 and 10
4
37
4 and 10
5
38
4 and 10
6
39
4 and 10
7
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