Rockwell Automation 1747-SCNR ControlNet Scanner Module Reference Manual - Manual (Page 30)

Publication 1747-RM623D-EN-P - June 2006
2-10 Prepare to Use the ControlNet Scanner
All scheduled data transfer to Input, Output, M0 and M1 files must be
mapped on a ControlNet network. You have to specify where I/O
data is to be read from or written to, in other words, mapped. Data
size and location within 1747-SCNR data files have to be configured
for each connection you want to setup with a remote device. The
configuration is performed using RSNetWorx for ControlNet software.
Unscheduled Data Server
The scanner supports some CIP data server functionality on a specific
local database of 256 words located in the M0 file. Any device on
ControlNet can read or write in this database using the supported
services as described in Local Database Access Using PLC-5 MSG
Instructions and Local Database and ControlNet Data Files Access
Using CIP Messaging.
The SLC processor that has read and write access to this area is then
able to receive or modify data into the database.
Using this Local Database:
• a device can send data to an SLC processor using unscheduled
data transfer.
• two devices can exchange unscheduled data by using this
database as a proxy data storage.
• a PLC-5 controller can exchange data with the SLC processor by
reading or writing in this area using MSG instructions.
• an HMI can exchange data with the SLC processor by reading or
writing in this area using PLC-5 type read and write commands.