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The following information describes the control-register-to-relay-channel mapping for a 1260-37A
Relay Module. This information may be used to control a 1260-37A when using a 1260-01T in the
register-based mode of operation.
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. 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.
Each channel between 0 and 23 (inclusive) is operated by setting or clearing two bits in parallel.
One bit in each of two different Control Registers must be set to operate these channels as a 4-wire
MUX.
Channels 100 through 139 are each operated by a single bit of a single Control Register.
2 Addendum Page
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Control Information for the 1260-37A
Channel
Control Register
0
0 and 3
1
0 and 3
2
0 and 3
3
0 and 3
4
0 and 3
5
0 and 3
6
0 and 3
7
0 and 3
8
1 and 4
9
1 and 4
10
1 and 4
11
1 and 4
12
1 and 4
13
1 and 4
14
1 and 4
15
1 and 4
16
2 and 5
17
2 and 5
18
2 and 5
19
2 and 5
20
2 and 5
21
2 and 5
22
2 and 5
23
2 and 5
100
6
101
6
102
6
103
6
104
6
105
6
106
6
107
6
108
7
109
7
1260-37 User Manual
Control Bit
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
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