Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 37)

Memory Organization
Chapter 4
4Ć8
any other functions if you want to achieve maximum flexibility within your
program.
When you enter the report generation message [M][S][,][0][RETURN] the
terminal displays the prompt: MESSAGE CONTROL WORDS (Y DIGITS
REQUIRED): where “Y” is the required 3 or 4 digits of a word address for the
selected data table size. You must enter the beginning word address of the
message control word file. The Industrial Terminal then calculates and displays
the ending address. You can locate the message control word file anywhere in
the data table except in Processor work areas and in the Input Image table (i.e.,
do a SEARCH 50 to display the number of racks). When using EPROMs,
Memory Write Protect is active: The message control word file must be placed
in the areas of Data Table4 which can be changed (010
8
- 177
8
). Once you
choose the start address, the Industrial Terminal displays a table which shows
the message numbers associated with each message control word.
NOTE: You must verify that the message control word location does not
coincide with a block transfer location or a timer or counter preset location.