Rockwell Automation 1747-DTAM-E,D17476.1 Data Table Access Module (DTAM) - Manual (Page 63)

Message Capability 8-3
Publication 1747-6.1
Word 0 Control bits:
EN Enable bit
ST Start bit
DN Done bit
ER Error Bit, used with the Error code. Refer to
chapter 9, Troubleshooting
EW Enabled and waiting bit
NR No response bit
TO Time out bit
Word 1 DTAM node address, 0-31 inclusive.
Word 2 Message length: 1, 8, 12, 13, 16 or 18 words (Read only).
Word 3 The value in the offset word determines whether or not a
displayed message is overwritten by a new message. If
the value entered in this word is:
0 This message cannot overwrite the previously
displayed message.
100 This message can overwrite the displayed
message.
After the MSG instruction is entered in the ladder program, the local
source file block (or message text) is entered through the Data
Monitor Function. The format of the local source file block depends
on the type of message length chosen.
The next sections describe the different messages and the format of
each local source file block. Refer to the SLC 500™ and
MicroLogix™ 1000 Instruction Set Reference Manual (Catalog
number 1747-6.15) for more information on the MSG instruction.