Rockwell Automation 25B PowerFlex 525 Embedded EtherNet/IP Adapter User Manual
Page 77
Rockwell Automation Publication 520COM-UM001B-EN-E - March 2013
77
Using Explicit Messaging
Chapter 6
CompactLogix Example Ladder Logic Program to Write Multiple
Parameters
A Scattered Write message is used to write to multiple parameters. This write
message example writes the following values to these five 16-bit parameters in a
PowerFlex 525 drive:
Example Controller Tags to Write Multiple Parameters
Example Ladder Logic to Write Multiple Parameters
PowerFlex 525 Drive Parameters
Write Value
A442 [Accel Time 2]
11.10 Sec
A443 [Decel time 2]
22.20 Sec
A415 [Preset Freq 5]
33.30 Hz
A416 [Preset Freq 6]
44.40 Hz
A417 [Preset Freq 7]
55.50 Hz
Operation
Controller Tags for Scattered Write Message
Data Types
XIC
Execute_Scattered_Write_Message
BOOL
MSG
Scattered_Write_Message
MESSAGE
IMPORTANT
If the explicit message scattered write must be written continuously, then use
a separate explicit message single write for each parameter using DPI
Parameter Object Class code 0x93 and attribute A (see
Formatting a Messageto Write a Single Parameter on page 73
). Attribute A
writes to RAM—not NVS (EEPROM) memory. This example scattered write
message using attribute 0 writes to NVS. Over time, continuous writes will
exceed the EEPROM life cycle and cause the drive to malfunction.
If you need to make frequent parameter changes using Explicit Messages, set
parameter C121 [Comm Write Mode] to 1 “RAM only”.
Execute_Scattered_Write_Message
Message
Message Control
Scattered_Write_Message
MSG
EN
DN
ER