Rockwell Automation 1747-DTAM-E,D17476.1 Data Table Access Module (DTAM) - Manual (Page 75)

Message Capability 8-15
Publication 1747-6.1
7-word message control block: N7:30 through N7:36
N7:30 = 0 message status
N7:31 = 2 DTAM node address
N7:32 = 18 message length
N7:33 = 100 offset (overwrite capability)
N7:34 through N7:36 = unused
18-word local source file: N7:40 through N7:57
N7:40 through N7:47 8-word message text
N7:48 through N7:51 data entry destination address
In this example the data entry destination address is N10:2. Memory
locations N7:48 through N7:51 are assigned as follows:
N7:52 = 250 initial value word
N7:53 through N7:57 acknowledge bit address
In this example the acknowledge bit address is B3:1.0/3. Memory
locations N7:53 through N7:57 are assigned as follows:
The following example is for the 8-word message in rung 2:
N10:2
File Type
File Number
Element
N7:48=7
N7:49=10
N7:50=2
Important: N10:2 must be allocated. See your software user
manual. Otherwise the DTAM displays
,OOHJDO
&RPPDQG .
B3:1.0/3
File Type
File
Number
Element
N7:53=3
N7:54=3
N7:56=0
Subelement
Bit
N7:57=3
N7:55=1
Read/Write:
Target Device:
Control Block:
Local Source File Address:
Target Node:
Target Offset:
Message Length in elements: WRITE
485 CIF
N7:60
N7:70
2
100
8
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