Rockwell Automation 1336T PLC Comm. Adapter, Series B, FRN 2.xx-3.xx - Manual (Page 155)

7–9
Publication 1336 FORCE–5.13 –– September, 1998
Message Operation
The Scattered Parameter Value Read function specified in the BTW
reads a pre–defined group of parameter values, in any order, from the
device. Word 3 of the BTW data file defines the number of
parameters to be read. The parameters to be read and their order is
defined starting with word 4. An unused word is left between each
parameter request, so the BTR can respond with the parameter value
as shown.
If an error has occurred in reading any of the parameters:
•
Word 2 of the BTR returns a value of -32765.
•
Bit 15 of the BTR word for the number of that parameter is set.
•
The BTR word for the value of that parameter returns a status
word instead of the parameter value.
Example
In this example, eight parameters were read from a 1336 FORCE, as
defined in word 3 of the BTW data file. The requested parameter
numbers were 5, 7, 8, 20, 18, 17, 19, and 36. The BTR response
returned the values of these parameters into the BTR data file. These
values are in drive units.
1 0
N10:10
2 3 4 5 6 7 8 9
N10:20
BTW
Data File
BTR
Data File
Data Format
8 5
0 17
19
0
3
18
0
0
7
19
0
0
8
36
0
0
20
N10:90
N10:100
8 5
4096 17
0
4096
3
18
6
51
7
19
1000
60
8
36
1000
6144
20
➀ ➀ ➀ ➀ ➀
➀ ➀ ➀ ➀ ➀
➀ ➀ ➀ ➀ ➀ ➀ ➀ ➀
➀ ➀ ➀ ➀ ➀ ➀ ➀ ➀ ➀
➀ These values vary depending on parameters and products.
Scattered Parameter Value Read
(continued)