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5 Message Communications
CompoNet Communications Unit User’s Manual (I582-E1)
5-3 Out
line o
f Mess
age F
unc
tion
and
Resp
on
se
5
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-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
Response Format
Normal response
Error response
Send failure or timeout
Max. 32 bytes
Command Code
Destination
node address
Service Code
Class ID
Instance ID
Service Data
(Attribute No.
or Attribute No.
+ Write Data)
28
02
Max. 32 bytes
Command Code
End Code
No. of received bytes
Source
node address
Service Code
Service Data
(Read Data)
28
28
02
02
28
02
00
00
Command Code
End Code
No. of received bytes
Source
node address
Service Code
(0094 hex fixed)
Error Code
28
28
02
02
28
02
00
00
00
94
Command Code
End Code
28
02
Summary of Contents for 3G3AX-MX2-CRT-E
Page 94: ...3 Network Startup 3 36 CompoNet Communications Unit User s Manual I582 E1...
Page 118: ...4 Remote I O 4 24 CompoNet Communications Unit User s Manual I582 E1...
Page 134: ...5 Message Communications 5 16 CompoNet Communications Unit User s Manual I582 E1...
Page 167: ...I 1 I CompoNet Communications Unit User s Manual I582 E1 Index...
Page 171: ......