6-24
Using Explicit Messaging
PowerFlex® 755 Drive Embedded EtherNet/IP Adapter User Manual
Publication 750COM-UM001A-EN-P
the LSW and MSW, and the third COP instruction correctly presents the
32-bit REAL (floating point) value.
SLC 500 – Formatting a Message to Read Multiple Parameters
Figure 6.28 Custom Scattered Read Message Configuration Screens
The following table identifies the data that is required in each box to
format a multiple read message.
SLC 500 Example Scattered Read Request Data
In this example, we use the data table addresses in
the request values to be read from these five 32-bit REAL (floating
point) parameters in a PowerFlex 750-Series drive: 001 - [Output
Frequency], 007 - [Output Current], 008 - [Output Voltage], 009 -
[Output Power], and 011 - [DC Bus Volts].
General Tab
Example Value
Description
Size in Words
Receive Data
Send Data
Data Table Address
Receive Data
Send Data
Service
(1)
Service Code
Class
Instance
Attribute
20
(2)
20
N60:0
N70:0
Custom
4D (Hex.)
93 (Hex.)
0 (Dec.)
0 (Dec.)
Each word size is a 16-bit integer.
Number of words to be received.
Number of words to be sent.
An unused controller data table address containing the message instruction.
This address is the starting word of the response file.
This address is the starting word of the request file.
Required for scattered messages.
Code for the requested service.
Class ID for the DPI Parameter Object.
Required for scattered messages.
Required for scattered messages.
MultiHop Tab
Example Value
Description
To Address
10.91.100.79
IP address of the adapter connected to the drive.
(1)
The default setting for Service is “Custom,” enabling entry of a Service Code not available from the Service pull-down menu. When
selecting a Service other than “Custom” from the pull-down menu, an appropriate Hex. value is automatically assigned to the Service
Code box which grays out (unavailable).
(2)
In this example, we are reading five 32-bit REAL (floating point) parameters. Each parameter being read requires four contiguous
16-bit words. Scattered read messages always assume that every parameter being read is a 32-bit parameter, regardless of its actual
size. The data structure format is shown in
. Maximum length is 128 words, which equates to 32 parameters.
