Allen-Bradley DeviceNet 1747-SDN - Page 17

Publication 1747-UM655B-EN-P - June 2007
Before You Begin 17
Communicating With Other Devices
1747-SDN Module
DeviceNet Devices
Input Data Storage
Input Data From
DeviceNet Devices
E
X
Y
Y
Different portions of data from a single
device can be mapped to separate
1747-SDN memory locations. For example,
On/Off values can be mapped to one
location, diagnostic values to another. This
is known as map segmenting. This concept
is illustrated by byte A, stored separately
as segments A1 and A2.
Output Data Storage
Output Data To
DeviceNet Devices
Byte
0
1
2
3
4
5
6
Z
Y
Y
Y
Output from
the SLC 500
processor.
B
A1
C
D
A2
E
E
Input from
the devices
to the
SLC 500
processor.
B
C
D
X
Z
A1
A2