Allen-Bradley DeviceNet 1756-DNB User Manual

1–5Planning Your Configuration
Publication 1756–6.5.15 – July 1998
Part III – RediSTATION Operator Interface
Mapping Output Data
The RediSTATION operator interface’s output is mapped to the
communication module’s discrete output data table. Within each of
these output bytes is a bit for the indicator light. The output image
table is then transferred from the host application. This example
highlights the poll messages from which the RediSTATION operator
interface receives its output bit.
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000
000
0
0000 0000 0000 0000
0000 0000 0000 0000
Word 0
Word 1
Word 2
Word 3
Word 4
1756–DNB Output Image Table
L = bit for the station indicator light
usage example: 2L = station indicator-light bit
for RediSTATION #2
RediSTATION Output Bytes
2L
1 byte
The indicator-light bit
for each RediSTATION
operator interface is
mapped to the communication
module’s output image table.
1
2
The output image-table
is then sent out to the operator
interfaces via poll messages
from which each operator
interface receives its
indicator-light bit.
What’s Happening?
= unused bits
Mapping Example Part III
RediSTATION Output
word 1
word 0
word 2
word 3
word 4
2L
Address
Data
1756–DNB Communication Module Output Image Table
start/stop station node address 2
Example: RediSTATION operator interface’ s
indicator-light bit (2L) is taken from word 1, bit 0 in
the 1756–DNB Output Image Table.
1
2
up to
word
122
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Allen-Bradley DeviceNet 1756-DNB Specifications

General

Brand	Allen-Bradley
Model	DeviceNet 1756-DNB
Category	Control Unit
Language	English