Rockwell Automation Publication 750COM-UM009A-EN-P - May 2017 105
Using Explicit Messaging Chapter 5
ControlLogix Controller Example Scattered Read Request Data
In this message example, the source tag Scattered Read Request, is used to read
the five floating point parameters (32-bit REAL) in the PowerFlex 755T drive.
See DPI Parameter Object on page 145
(Class code 0x93) or Host DPI
Parameter Object on page 163 (Class code 0x9F) for parameter numbering.
See the data structure in Figure 25
.
• 10:001 - [Output Frequency]
• 10:003 - [Output Current]
• 10:002 - [Output Voltage]
• 10:004 - [Output Power]
• 0:003- [DC Bus Volts]
Figure 25 - Example Scattered Read Request Data
ControlLogix Controller Example Scattered Read Response Data
The Scattered Read Request message reads multiple parameters and returns
their values to the destination tag (Scattered_Read_Response). Figure
shows
the parameter values which, in this example, have been converted using a
UDDT for correct presentation. For parameters that are 32-bit integers, do not
COP (copy) the data to a REAL tag. COP (copy) could have been used instead
of a UDDT for parameter less than 32-bits. Example Scattered Read Response
Converted Data
In this message example, the parameters have the following values, the values
are written as Port Number: Parameter Number - [Parameter Name]
PowerFlex 755T Drive Parameter Read Value
10:1 - [Output Frequency] 60.205975 Hz
10:3 - [Output Current] 12.570678 A
10:2 - [Output Voltage] 418.34348V AC
10:4 - [Output Power] 12.3534 kW
0:3 - [DC Bus Volts] 566.5277V DC
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