User Manual 1260-38
Module Operation 3-1
Chapter 3
MODULE OPERATION
Module
Configuration
The 1260-38 is a 1 x 128 Two-Wire Scanner/Multiplexer Module
consisting of eight pairs of 1 x 8 multiplexers. These eight pairs of
multiplexers, in conjunction with interconnecting relays, allow the
1260-38 module to be configured as:
- One 1 x 64 Four-wire multiplexer
- One 1 x 128 Two-wire multiplexer
- One 1 x 256 One-wire multiplexer
Each pair of 1 x 8 multiplexers can he independently configured
as:
- Two 1 x 8 Two-wire multiplexers
- One 1 x 16 Two-wire multiplexer
- One 1 x 32 One-wire multiplexer
- One 1 x 8 Four-wire multiplexer
Reference should be made to Figure 3-1, 1260-38 Module
Configuration Block Diagram, and Figure 3-2, 1260-38 multiplexer
Configuration Block Diagram.
The multiplexer pairs consist of two 1 x 8 multiplexers, giving a
total of sixteen 1 x 8 multiplexers (00 through 15). Each 1 x 8
multiplexer consists of one two-wire common and eight two-wire
channels. The channels are numbered 0000 to 0007 for
multiplexer 00, through 0150 to 0157 for multiplexer 15.
The even-numbered multiplexers (00,02,... 14) have a second two-
wire common which has 100
Ω
series resistors in both the high and
low paths. The even-numbered multiplexers also include a one-
wire relay (channels 9000 though 9007) which select the high or
low path of both two-wire common and 100
Ω
resistor two-wire
common.
Interconnecting relays (channels 1002, 2002, ....8002) join the
multiplexers to form multiplexer pairs. The multiplexer pairs are
formed by multiplexers 00-01, 02-03, 04-05, 06-07, 08-09, 10-11,
12-13, and 14-15.
The multiplexer pairs are joined to each other through two more
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