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1260-132 User Manual
Module Operation 3-6
A 1260-132 with a module address of 7 would have the base A24
address computed as follows:
Base A24 Address of 1260-132 = 204000
16
+ (400
16
x
7
10
) = 205C00
16
The control registers for Adapt-a-Switch plug-ins and conventional
1260-Series modules are always on odd-numbered A24
addresses. The three control registers for the 1260-132 reside at
the first three odd-numbered A24 addresses for the module:
(Base A24 Address of 1260-132) + 1 = Control Register 0
(Base A24 Address of 1260-132) + 3 = Control Register 1
(Base A24 Address of 1260-132) + 5 = Control Register 2
So, for our example, the three control registers are located at:
205C01
Control Register 0, controls channels 0
through 7.
205C03
Control Register 1, controls channels 8
through 15.
205C05
Control Register 2, controls channels 16
through 23.
Table 3-1
shows the channel assignments for each control
register.
Table 3-1, Control Register Channel Assignments
Channels
Control
Register
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
0
7
6
5
4
3
2
1
0
1
15
14
13
12
11
10
9
8
2
23
22
21
20
19
18
17
16
Setting a control bit to 1 closes the corresponding channels and
clearing the bit to zero opens the channels. Thus, if you write the
value 1000 0101 binary = 133 decimal = 85 hexadecimal to Control
Register 0, channels 0, 2, and 7, will close, while channels 1,3,4,5,
and 6, will be open.
Summary of Contents for 1260-132
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