Module/processor communication chapter 4 – Rockwell Automation 1771-DE Absolute Encoder Module User Manual User Manual
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Module/Processor Communication
Chapter 4
4Ć2
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 BlockĆtransferĆwrite Data
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
OE ZT >
=
<
>
=
<
OE ZT >
=
<
>
=
<
Control word
for Outputs 0 and 1
Preset 0A
Preset 0B
Preset 1A
Preset 1B
Word #1
2
3
4
5
OE ZT >
=
<
>
=
<
OE ZT >
=
<
>
=
<
Control word
for Outputs 2 and 3
Preset 2A
Preset 2B
Preset 3A
Preset 3B
6
7
8
9
10
OE ZT >
=
<
>
=
<
OE ZT >
=
<
>
=
<
Control word
for Outputs 4 and 5
Preset 4A
Preset 4B
Preset 5A
Preset 5B
11
12
13
14
15
OE ZT >
=
<
>
=
<
OE ZT >
=
<
>
=
<
Control word
for Outputs 6 and 7
Preset 6A
Preset 6B
Preset 7A
Preset 7B
16
17
18
19
20
A. WriteĆdata Words
OE ZT >
=
<
>
=
<
OE ZT >
=
<
>
=
<
OE = Output Enable Bit
ZT = Zero Transition Bit
COM = Comparison Bits
COM for
Preset 1B
COM for
Preset 1A
COM for
Preset 0B
COM for
Preset 0A
B. Format of Control
Word #1
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