Reference Manual User Manual

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
Unscheduled Data Transfers
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
Logic Scan
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
4155
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