Rockwell Automation 1747-SCNR ControlNet Scanner Module Reference Manual - Manual (Page 24)

Publication 1747-RM623D-EN-P - June 2006
2-4 Prepare to Use the ControlNet Scanner
Unscheduled Data Transfer Operations on a ControlNet Network
The ControlNet network lets you use unscheduled messaging in
addition to deterministic delivery.
Unscheduled operations include:
• peer-to-peer messaging.
• messaging from any remote CIP client device.
• messaging from programming devices.
• CIP client message initiated by the SLC processor ladder
program.
This process is illustrated in the figure.
Link Layer Services
The figure illustrates link layer services.
M0
Local
Database
area
U
n
sc
hedule
d
Data T
rans
fer
s
M0
CIP client
message
area
Housekeeping
1747-SCNR Unscheduled Data
M0 file transfer
(SLC processor
read and write)
M0 file transfer
(write request -
read response)
41555
Lo
g
ic S
ca
n
Data
Table
Files
SLC 500 Program Scan
Data Tables Files
Housekeeping
Data
Table
Files
Network Update Time (NUT)
Scheduled
Service
Unscheduled
Service Network Maintenance
Time
41556