Rockwell Automation 20-COMM-D DeviceNet Adapter Series B FRN 2.xxx - Manual (Page 141)

Using Explicit Messaging 6-13
20-COMM-D DeviceNet Adapter User Manual
Publication 20COMM-UM002G-EN-P
Read Multiple Parameters
ControlLogix Controller Example Ladder Logic Program to Read Multiple
Parameters Using RSLogix 5000 Software, Any Version
A Scattered Read message is used to read the values of multiple parameters.
Up to 22 parameters can be read. This read message example reads the
values of these five parameters in a PowerFlex 7-Class drive:
• Parameter 001 - [Output Freq]
• Parameter 003 - [Output Current]
• Parameter 006 - [Output Voltage]
• Parameter 012 - [DC Bus Voltage]
• Parameter 017 - [Analog In1 Value]
See DPI Parameter Object on page C-13 (Class Code 0x93) for parameter
numbering.
Important: See Table 6.A on page 6-2 for limitations of PowerFlex 7-Class
and PowerFlex 750-Series drives when using DPI Parameter
Class code 0x93 for explicit messaging.
Table 6.F Example Controller Tags to Read Multiple Parameters
Figure 6.12 Example Ladder Logic to Read Multiple Parameters
Operand Controller Tags for Read Multiple Message Data Type
XIC Execute_Scattered_Read_Message BOOL
MOV Scattered_Read_Request_Internal_Use_Only[0] SINT[32]
COP Scattered_Read_Request[0] INT[15]
MSG Scattered_Read_Message MESSAGE
TIP: The MOV (Move) and COP (Copy) instructions are required to
convert the data into the necessary data types, and to align the data into a
usable display format.