Rockwell Automation 1747-DTAM-E,D17476.1 Data Table Access Module (DTAM) - Manual (Page 64)

8-4 Message Capability
Publication 1747-6.1
5/03 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:
Bit/
Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 EN ST DN ER CO 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
7 Reserved (Internal Messaging Bits)
8 Message Timer Preset
9 Message Timer Scaled Zero
10 Message Timer Accumulator
11 Reserved (Internal Use Only)
12 Reserved (Internal Use Only)
13 Reserved (Internal Use Only)