Allen-Bradley DeviceNet 1756-DNB User Manual

1–3Planning Your Configuration
Publication 1756–6.5.15 – July 1998
Part I – Photoelectric Sensor
Mapping Input Data
The photoelectric sensor inputs are mapped to the scanner’s input
data table and then to the host platform’s input data file.
0000 0000 0000 0000
0000 0000 0000
00
00
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
Word 2
Word 3
Word 4
Word 5
Host Platform
Input Image Table
D = data bit
S = status bit
usage example: 1D = data bit for photoelectric sensor #1
1S = status bit for photoelectric sensor #1
Photoelectric Sensor Input Bytes
photoelectric sensor node address 1
1D1S
1 byte
1
What’s Happening?
= unused bits
Series 9000 Photoelectric Sensor Inputs
word 1
word 0
2
word 2
word 3
word 4
1756–DNB Communication Module Input Image Table
1D1S
word 5
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
Word 6
Word 7
Word 8
Address
Data
word 123
up to
Example: The data bit for photoelectric
sensor #1 (1D) appears at word 1, bit 1
in the input image table of your host platform.
1
2
The status and data bits from the
photoelectric sensor are mapped
into the communication module’s
input data table.
The data table is then
transferred to the host
platform’s input data file.
Important: The communication
module’s only makes the data
available for the host platform to
read. The communication
module’s does not move the
data to the host platform.
Word 0
Word 1
Allen-Bradley Drives

Allen-Bradley DeviceNet 1756-DNB Specifications

General

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