Mapping Redistation Output Data For An M0 File Data Table Write - Allen-Bradley SLC 500 DeviceNet User Manual

2-6 Planning Your Configuration and Data Mapping Your Devices
What's Happening?
The SLC 500 processor's output
1
data file containing the indicator
light bit for the RediSTATION is
transferred to the 1747-SDN
Scanner's M0 file data table.
2
The M0 file data table is then
sent to the RediSTATION via a
polled message from which the
RediSTATION receives its
indicator light bit.
PLC-5 Processor
Output Data File
N8:0 0000 0000 0000 000L
N8:1 0000 0000 0000 0000
N8:2 0000 0000 0000 0000
N8:3 0000 0000 0000 0000
N8:4 0000 0000 0000 0000
N8:149 0000 0000 0000 0000
1
This mapping is based upon the example in chapter 4.
The actual mapping for your system may be different.
Publication 1747-6.5.5 - August 2000
Mapping RediSTATION Output Data for an M0 File Data Table
Write
The RediSTATION's output is mapped to the 1747-SDN module's M0
file. Within the output byte is a bit for the indicator light. The output
data file is then transferred from the SLC 500 processor application to
turn the light on or off.
1
1
RediSTATION Output Byte
start/stop station node address 7
1 byte
1747-SDN Scanner M1 File Data Table
Example: The RediSTATION's indicator light (L) is taken
from N8:1/0 in the SLC 500 processor's output data file.
L = bit for the station
L
indicator light
= unused bits
2
L
Word 0
Word 1
Word 2
Word 3
Word 4
Up to
Word 149