Allen-Bradley SLC 500 DeviceNet, User Manual, Page: 36 / 139

Publication 1747-6.5.5 - August 2000
2-8 Planning Your Configuration and Data Mapping Your Devices
Mapping Photoeye Input Data for an M1 File Data Table Read
What’s Next? Chapter 3 describes how to set up the system hardware for the
example application.
What’s Happening?
Important : The 1747-SDN module only
makes the data available for the
processor to read. The 1747-SDN
module does not move the data to the
processor.
= unused bits
1
Photoeye Input Byte
1 byte
1
2
The status and data bits from
the photoeye are mapped into
the 1747-SDN Scanner’s M1
file data table.
The M1 file data table is then
transferred to the SLC 500
processor’s input data file.
S D
2
1
This mapping is based upon the examples in
chapters 4 and 6. The actual mapping for your
system may be different.
Word 0
Word 1
Word 2
Word 3
Word 4
Up to
Word 149
1747-SDN Scanner M1 File Data Table
S D
N7:0 0000 00 SD 0000 0000
N7:1 0000 0000 0000 0000
N7:2 0000 0000 0000 0000
N7:3 0000 0000 0000 0000
N7:4 0000 0000 0000 0000
SLC 500 Processor
Input Data File
1
N7:149 0000 0000 0000 0000
Example: The Status bit from the photoeye appears in the SLC 500
processor’s input data file at address N7:0/9.
The Data bit from the photoeye appears in the SLC 500 processor’s
input data file at address N7:0/8.
RediSTATION