User Manual

4–38 Using Unscheduled Messaging
Publication 1336 FORCE–5.18 ––March, 1999
The corresponding source parameters are returned through the PMR
response.
If an error has occurred in reading any of the links:
• Word 2 of the PMR returns a value of -32763.
• Bit 15 of the PMR word for the number of that link is set, making
the value negative.
Example
In this example, a Scattered Parameter Link Read of four links was
requested through the PMW. Sink parameters 119 through 367 and
401 were defined as the desired links to be read. The PMR returned
the corresponding source parameter values in the words reserved for
this information. If an error had occurred for a specific link, the
value returned would be negative.
10 23456789
PLC MSG
Write File
Data Format
N7:10
41195 0 368 0 367 0 40112
N7:20
0
PLC MSG
Read File
N7:90
41195 0 368 331 367 330 401
Sink Source Sink Source
0
N7:100
0
Scattered Parameter Link Read
(continued)