Control Information for the 1260-30A
The following information describes the control-register-to-relay-channel mapping for a 1260-30A Relay
Module. This information may be used to control a 1260-30A when using a 1260-01T in the register-based
mode of operation.
Each relay on this module is controlled by setting or clearing a single bit within a Control Register. 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 from logical channels to control bits. The logical channels are used when
operating the relay module in message-based mode. The control bits within the Control Registers are used to
operate the module 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
Channel
Control Register
Control Bit
0
0
0
1
0
1
2
0
2
3
0
3
4
0
4
5
0
5
6
0
6
7
0
7
8
1
0
9
1
1
10
1
2
11
1
3
12
1
4
13
1
5
14
1
6
15
1
7
16
2
0
17
2
1
18
2
2
19
2
3
20
2
4
21
2
5
22
2
6
23
2
7
24
3
0
25
3
1
26
3
2
27
3
3
28
3
4
29
3
5
30
3
6
31
3
7
32
4
0
33
4
1
34
4
2
35
4
3
36
4
4
37
4
5
38
4
6
39
4
7
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