Rockwell Automation 20-COMM-R Remote I/O Adapter - Manual (Page 65)

Using Block Transfer Messaging 5-7
20-COMM-R Remote Adapter I/O User Manual
Publication 20COMM-UM004D-EN-P
ControlLogix Controller
Example
Data Format for a Read and Write Parameter
The data in this example is for a PowerFlex 70 drive at Remote I/O rack.
The following set of arrays shows a read of drive parameter 1 - [Output
Freq]. The value of parameter 1 is 213 (21.3 Hz).
MsgBlockTransferWrite (Request Data) to Read Drive Parameter 1 (Hex)
MsgBlockTransferRead (Response Data) to Read Drive Parameter 1 (Hex)
The following set of data files shows a write of drive parameter 41 [Motor
NP Volts]. The value written is 2300 (230.0V AC).
MsgBlockTransferWrite (Request Data) to Write to Drive Parameter 41 (Hex)
MsgBlockTransferRead (Response Data) to Write to Drive Parameter 41 (Hex)
See Formatting Block Transfer Messages on page 5-2 for more information
on block transfer messages.
Int Address Value (hex) Description See Page
Offset 0 000A Length of Message = 10 bytes (A hex) 5-3
Offset 1 0081 Required Setting 5-3
Offset 2 000E Service = Get_Attribute_Single C-1
Offset 3 0093 Class = 93 DPI Parameter Object C-5
Offset 4 0001 Instance = Parameter 1 (1 hex) C-5
Offset 5 0009 Attribute = 09 DPI Parameter Value C-6
Int Address Value (hex) Description See Page
Offset 0 0004 Length of Message = 4 bytes 5-4
Offset 1 0000
The Message was Successful 5-4
Offset 2 0000
Offset 3 00D5 Response Data = 213 (D5 hex) = 21.3 Hz. n/a
Int Address Value (hex) Description See Page
Offset 0 000C Length of Message = 12 bytes (C hex) 5-3
Offset 1 0081 Required Setting 5-3
Offset 2 0010 Service = Set_Attribute_Single C-1
Offset 3 0093 Class = 93 DPI Parameter Object C-5
Offset 4 0029 Instance = Parameter 41 (29 hex) C-5
Offset 5 0009 Attribute = 09 DPI Parameter Value C-6
Offset 6 08FC Data = 2300 (8FC hex) = 230.0V AC n/a
Int Address Value (hex) Description See Page
Offset 0 0002 Length of Message = 2 bytes 5-4
Offset 1 0000
The Message was Successful 5-4
Offset 2 0000