Rockwell Automation 20-750-DNET PowerFlex DeviceNet Option Module - Manual (Page 77)

Rockwell Automation Publication 750COM-UM002B-EN-P - October 2012 77
Using Explicit Messaging Chapter 6
ControlLogix Controller Example Scattered Write Request Data
In this message example, we use the data structure in Figure 23 in the source tag
(Scattered_Write_Request) to write new values to these 32-bit REAL (floating
point) parameters:
See DPI Parameter Object on page 109 (Class code 0x93) or Host DPI
Parameter Object on page 123 (Class code 0x9F) for parameter numbering.
Figure 23 shows the parameter values which, in this example, have been
converted using a UDDT to correctly write their values. COP (Copy)
instructions could have been used for this purpose instead of a UDDT. If the
parameters being written to are 32-bit integers, do not COP the data to a REAL
tag.
Figure 23 - Example Scattered Write Request Converted Data
ControlLogix Controller Example Scattered Write Response Data
The results of the message appear in the destination tag named
Scattered_Write_Response (
Figure 24 ). Values of ‘0’ indicate no errors occurred.
Figure 24 - Example Scattered Write Response Data
PowerFlex 750-Series Drive Parameter Write Value
536 - [Accel Time 2] 11.1 Sec
538 - [Decel Time 2] 22.2 Sec
575 - [Preset Speed 5] 33.3 Hz
576 - [Preset Speed 6] 44.4 Hz
577 - [Preset Speed 7] 55.5 Hz