Rockwell Automation 20-COMM-Q ControlNet Adapter - Manual (Page 172)

6-44 Using Explicit Messaging
20-COMM-C/Q ControlNet Adapter User Manual
Publication 20COMM-UM003F-EN-P
SLC 500 Controller Example Ladder Logic Program to Write a Single Parameter
Using Read/Write Parameter Service
A Write Parameter message is used to write to a single parameter. This
write message example writes a value to parameter 140 - [Accel Time 1] in
a PowerFlex 7-Class drive.
Important: Parameter Object Class code 0x0F is not supported in
PowerFlex 750-Series drives. To do a single parameter write,
follow the SLC 500 (Generic Attribute Service) single write
example on
page 6-51 .
Figure 6.54 Example Ladder Logic to Write a Single Parameter
Important: If the explicit message single write must be written
continuously, use the Generic Set Attribute Single service and
attribute A (10 decimal; see
page 6-51 ). This writes to RAM—
not NVS (EEPROM) memory. This example single write
message using Class code F writes to NVS. Over time,
continuous writes will exceed the EEPROM life cycle and
cause the drive to malfunction.