Allen-Bradley DeviceNet 1784-PCIDS, Руководство пользователя, Страница: 28 / 101

Publication 1784-6.5.30 - February 2001
2-6 Planning Your Configuration and Data Mapping Your Devices
Mapping RediSTATION Output Data
The RediSTATION operator interface’s output byte is mapped to the
scanner’s output data table. Within the output byte is bit 0 for the
indicator light. The output data file is then transferred from the host
application to turn the light on or off.
1
start/stop station node address 7
L = bit for the station
indicator light
2
The indicator light bit for the
RediSTATION is mapped to the
scanner’s output data table.
What’s Happening?
The output image table is then
sent to the RediSTATION via a
poll message from which the
RediSTATION receives its
indicator light bit.
= unused bits
2
RediSTATION Output Byte
L
1
Example: The RediSTATION’s indicator
light (L) is taken from word 0, bit 0 in
the host application’s output image
table.
Word 0
Word 1
Word 2
Word 3
Word 4
Word 1023
1784-PCIDS Scanner Output Image Table
1
L
Word 0 0000 0000 0000 000 L
Word 1 0000 0000 0000 0000
Word 2 0000 0000 0000 0000
Word 3 0000 0000 0000 0000
Word 5 0000 0000 0000 0000
Word 4 0000 0000 0000 0000
Host Application
Output Data File
Word 5
up to
1
This mapping is based upon the example in chapter 5.
The mapping for your system may be different.
The host application writes to bit
0 (“L”) of word 0 in its Output
Data File.
The RediSTATION indicator light
then turns on or off.