Allen-Bradley SLC 500 DeviceNet, User Manual, Page: 22 / 139

Publication 1747-6.5.5 - August 2000
1-6 Before You Begin
1747-SDN Scanner Module
DeviceNet Devices
Input Data Storage
Input Data From
DeviceNet Devices
E
Y
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, etc. 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