Rockwell Automation 1747-DTAM-E,D17476.1 Data Table Access Module (DTAM) - Manual (Page 62)

8-2 Message Capability
Publication 1747-6.1
Programming the MSG
Instruction
The DTAM message is configured in the 5/02 or 5/03 processor user
program by selecting a message (MSG) instruction and entering the
following parameters:
5/02 Control Block
Configuration
Most of the MSG instruction parameters are stored in its associated
control block. The “delivery” status and any error code of the
message are also stored there. The information below describes the
message instruction control block layout necessary to display
messages on the DTAM:
Message Type: Write
Target Device: 485CIF
Network Type (5/03 only): Local or Remote
Control Block Address:
Starting address of an unused block of 7 words
(5/02) or 14 words (5/03) in any bit or integer file
(to store message status)
Source File Address:
Starting address of an unused block or x words in
any bit or integer file (to store message text), where
x = message length or the DTAM message type
Target Node Address:
DTAM node address (as defined in the module set-
up procedure), 0 through 31 inclusive
Offset:
Message overwrite capability: 0 for cannot overwrite
or 100 for can overwrite
Message Length:
Number of words in selected DTAM message type
(1, 8, 12, 13, 16, or 18)
Channel (5/03 only):
Processor communication port:
1 for DH485 channel
or 0 for RS232 channel
Bit/
Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 EN ST DN ER EW NR TO Error Code
1 DTAM Node Address
2 Message Length in Words (Read Only)
3 Offset Word (0 or 100)
4 Not Used
5 Not Used
6 Not Used