Rockwell Automation 1747-DTAM-E,D17476.1 Data Table Access Module (DTAM) - Manual (Page 74)

8-14 Message Capability
Publication 1747-6.1
18-word local source file: N7:10 through N7:27
N7:10 through N7:17 8-word message text
N7:18 through N7:21 data entry destination address
In this example the data entry destination address is N10:1. Memory
locations N7:18 through N7:21 are assigned as follows:
N7:22 = 1 initial value word
N7:23 through N7:27 acknowledge bit address
In this example the acknowledge bit address is B3:1.0/1. Memory
locations N7:23 through N7:27 are assigned as follows:
The following example is for the 18-word message in rung 1:
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, N7:40 through N7:47 are displayed in the ASCII radix. The rest of the file is
displayed in Decimal.
N10:1
File Type
File Number
Element
N7:18=7
N7:19=10
N7:20=1
Important: N10:1 must be allocated. See your software user
manual. Otherwise the DTAM displays
,OOHJDO
&RPPDQG .
B3:1.0/1
File Type
File
Number
Element
N7:23=3
N7:24=3
N7:26=0
Subelement
Bit
N7:27=1
N7:25=1
Read/Write:
Target Device:
Control Block:
Local Source File Address:
Target Node:
Target Offset:
Message Length in elements: WRITE
485 CIF
N7:30
N7:40
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
N7:30 0 2 18 100 0 0 0 0 0 0
N7:40 E N T E R H I G H R A N GE 7 10
N7:50 2 0 250 3 3 1 0 3 0 0