AB Quality Allen-Bradley 1771-DE User Manual page 26

Chapter 4
Module/Processor Communication
A. Write data Words
B. Format of Control
Word #1
4 2
outputs 4 and 5 (and the module is controlling all eight outputs), you must
send 20 words to the module; you cannot send only the words associated
with outputs 4 and 5.
Figure 4.1
Format of Block transfer write Data
17 16 15 14
Word #1 OE ZT > =
2
3
4
5
6 OE ZT > =
7
8
9
10
11 OE ZT > =
12
13
14
15
16 OE ZT > =
17
18
19
20
COM for
Preset 1B
OE ZT > =
OE = Output Enable Bit
ZT = Zero Transition Bit
COM = Comparison Bits
13 12 11 10 07 06
< > = < OE ZT
< > = < OE ZT
< > = < OE ZT
< > = < OE ZT
COM for
Preset 1A
< > = < OE ZT
05 04 03 02 01 00
> = < > = <
> = < > = <
> = < > = <
> = < > = <
COM for COM for
Preset 0B Preset 0A
> = < > = <
Control word
for Outputs 0 and 1
Preset 0A
Preset 0B
Preset 1A
Preset 1B
Control word
for Outputs 2 and 3
Preset 2A
Preset 2B
Preset 3A
Preset 3B
Control word
for Outputs 4 and 5
Preset 4A
Preset 4B
Preset 5A
Preset 5B
Control word
for Outputs 6 and 7
Preset 6A
Preset 6B
Preset 7A
Preset 7B
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