Outline Of Message Function And Response - Omron CompoNet MX2 Series User Manual

5-3 Outline of Message Function and
Response
When using the Message function, the CompoNet Communications Unit on the inverter returns the
response in the following method.
In CompoNet communications, data is sent/received basically in units of 1 byte (8 bits).
For single-word (16-bit) data, the order of high and low bytes will be reversed due to the following rea-
son.
• Data on communications lines: Sent/received in order of low byte to high byte.
• Data processed in programmable controller when issuing a command etc.: Sent/received in order
of high byte to low byte.
Therefore, for attributes indicated as "word" in the Size column of the tables provided in A-1 General
Object Specifications on page A-2 and A-2 AC Drive Object Specifications on page A-11, create attach-
ment data or read response data in reverse order of high and low bytes.
Precautions for Correct Use Precautions for Correct Use
For Remote I/O, this need not be considered because high and low bytes will be reversed
automatically.
 Command Format
28 02
Command Code
 Response Format
Normal response
28 28 28 02 02 02
Command Code
Error response
28 28 28 02 02 02
Command Code
Send failure or timeout
28 02
Command Code
CompoNet Communications Unit User's Manual (I582-E1)
Destination Service Code
node address
00 00
End Code No. of received bytes
00 00
End Code No. of received bytes
End Code
5 Message Communications
Class ID Instance ID
Source Service Code
node address
00
Source Service Code
node address (0094 hex fixed)
Max. 32 bytes
Service Data
(Attribute No.
or Attribute No.
+ Write Data)
Max. 32 bytes
Service Data
(Read Data)
94
Error Code
5 - 7
5