Rockwell Automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CONC(OR.DU1 - Manual (Page 67)

Using the 1775ĆMX
Memory Communication Module
Chapter 4
4-20
Start $ Command
The START $ command lets you transfer selected files from the
primary to the backup processor. You can select from 1 to 16 files for use
with this function. The START $ function is equivalent to the
FILE TRANSFER function in LIST.
After the primary processor executes a message instruction containing the
START $ command, the memory communication module
transfers the group of selected files from the primary to the backup
processor continuously. For file transfer to occur, the primary processor
must be in run mode or test mode. If you switch the primary processor to
program mode, file transfer will stop.
You may use either commas (,) or slashes (/) as delimiters when specifying
files. You can specify files like this:
$ sf, s
2
f
2
, s
3
f
3
, ... , s
16
f
16
or like this:
$ sf / s
2
f
2
/ s
3
f
3
/ ... / s
16
f
16
where: s is the data table section specifier (Table 4.I)
f is the file number
If the list of files contains a file that does not exist in the primary
processor, the memory communication module:
displays the message FILE LIST ERROR on the PLC-3 front panel or
on the programming terminal
proceeds to the next legitimate file in the list