Rockwell Automation DEVICENET 1771-SDN, User Manual

Page: 34 / 139

Publication 1771-6.5.132 - June 2000
2-6 Planning Your Configuration and Data Mapping Your Devices
Mapping RediSTATION Output Data for a Block Transfer Write
The RediSTATION operator interface’s output byte is mapped to the
1771-SDN module’s block transfer write data table. Within the output
byte is bit 0 for the indicator light. The PLC-5’s output data file is
transferred by the processor application to turn the light on or off. In
this example, we use N10 for the output data file.
1
start/stop station node address 7
L = bit for the station
indicator light
2
The PLC-5 processor’s output
data file containing the indicator
light bit for the RediSTATION is
transferred via a BTW to the
1771-SDN Scanner’s BTW data
table.
What’s Happening?
The BTW data table is then sent
to the RediSTATION via a polled
message from which the
RediSTATION receives its
indicator light bit.
= unused bits
2
RediSTATION Output
1 byte
L
1
Example: The RediSTATION’s indicator light (L) is taken
from N10:1/0 in the PLC-5 processor’s output data file.
1
This mapping is based upon the example in chapter 4.
The actual mapping for your system may be different.
= bits reserved for module
status word
Word 0
Word 1
Word 2
Word 3
Word 4
Word 61
1771-SDN Scanner Block Transfer Write Data Table
L
reserved for module status word
N10:0 0000 0000 0000 0000
N10:1 0000 0000 0000 000 L
N10:2 0000 0000 0000 0000
N10:3 0000 0000 0000 0000
N10:5 0000 0000 0000 0000
N10:4 0000 0000 0000 0000
PLC-5 Processor
Output Data File
1
N10:61 0000 0000 0000 0000
Note: This example uses
1-slot addressing.