6-14 Using Explicit Messaging
PowerFlex® 755 Drive Embedded EtherNet/IP Adapter User Manual
Publication 750COM-UM001A-EN-P
PLC-5 Example
Important:The PLC-5 must be Series E (Rev. D.1 or higher) to support
the MultiHop feature that routes messaging to the drive.
Important:Due to inherent limitations with the PCCC N-File method,
only contiguous multiple parameters can be read or written
in one explicit message.
For explicit messaging, the N150 N-Files must be used because they are
already mapped to specific parameters in the drive and its connected
peripherals. This enables direct access to any parameter.
For PCCC N150 N-File information, refer to page C-9
.
PLC-5 Example Ladder Logic Program to Read Single Parameter
A Generic Get Attribute Single message is used to read a single
parameter. This read message example reads the value of the 32-bit
REAL (floating point) parameter 007 - [Output Current] in a PowerFlex
750-Series drive.
Figure 6.15 Example Ladder Logic Explicit Messaging Program for Read Single
Three COP (Copy) instructions are required to convert the 16-bit integer
data table addresses N40:0 (Least Significant Word) and N40:1 (Most
Significant Word) to a 32-bit REAL (floating point) data table address
F102:0 for correct presentation. The first two COP instructions swap
the LSW and MSW, and the third COP instruction correctly presents the
32-bit REAL (floating point) value.
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