Rockwell Automation DEVICENET 1771-SDN, User Manual

Page: 33 / 139

Publication 1771-6.5.132 - June 2000
Planning Your Configuration and Data Mapping Your Devices 2-5
Mapping RediSTATION Input Data for a Block Transfer Read
The RediSTATION operator interface’s input byte is mapped to the
scanner’s block transfer read data table through a 62 word BTR. In this
example, we use data file N9:0.
1
2
The bits for the RediSTATION
operator interfaces’s red and green
buttons are mapped into the
1771-SDN Scanner’s BTR data
table.
What’s Happening?
The BTR data table is then
transferred via a BTR to the PLC-5
processor’s input data file.
Important : The 1771-SDN module only
makes the data file available for the
processor to read. The 1771-SDN does
not move the data file to the processor.
R = bit for red button (STOP)
G = bit for green button (START)
N9:0 0000 0000 0000 0000
N9:1 0000 0000 0000 00 GR
N9:2 0000 0000 0000 0000
N9:3 0000 0000 0000 0000
N9:5 0000 0000 0000 0000
Word 0
Word 1
Word 2
Word 3
Word 4
Word 61
The red STOP button from the
RediSTATION appears in the PLC-5
processor’s input file at address N9:1/0.
N9:4 0000 0000 0000 0000
RediSTATION Input Byte
= unused bits
1
1771-SDN Scanner Block Transfer Read Data Table
1 byte G R
2
G R
1
This mapping is based upon the example in chapter 4.
The mapping for your system may be different.
PLC-5 Processor
Input Data File
1
reserved for module status word
= bits reserved for module
status word
Note: This example uses
1-slot addressing.
N9:61 0000 0000 0000 0000
Example: The green START button from
the RediSTATION appears in the PLC-5
processor’s input file at address N9:1/1.