Rockwell Automation 1747-DTAM-E,D17476.1 Data Table Access Module (DTAM) User Manual
Page 73
Message Capability
8-13
Publication 1747-6.1
The following example is the data monitor display for the 18-word
message instruction in Rung 0:
Below is the data monitor display for the message control block and
the local source file, followed by an explanation of the data file.
For ease of viewing, N7:10 through N7:17 are displayed in the ASCII radix. The rest of the file is
displayed in Decimal.
7-word message control block: N7:0 through N7:6
N7:0 = 0
message status
N7:1 = 2
DTAM node address
N7:2 = 18
message length
N7:3 = 100
offset (overwrite capability)
N7:4 through N7:6 = unused
Read/Write:
Target Device:
Control Block:
Local Source File Address:
Target Node:
Target Offset:
Message Length in elements:
WRITE
485 CIF
N7:0
N7:10
2
100
18
ignore if timed out:
to be retried:
awaiting execution:
error:
message done:
message transmitting:
TO
NR
EW
ER
DN
ST
0
0
0
0
0
0
0
Address
0
1
2
3
4
5
6
7
8
9
N7:0
0
2
18
100
0
0
0
0
0
0
N7:10
E N
T E
R
L O
W
R A
N G
E
7
10
N7:20
1
0
1
3
3
1
0
1
0
0