Omron CJ Series Operation Manual page 223

• When a CompoNet Master Unit receives an explicit message, it automatically returns a response
to the message.
Service Data
• For the command format, specify the lower bytes (L) first followed by the higher bytes (H) for the
word (2-byte) data and double-word (4-byte) data in the service data (such as word data and error
clear codes).
Example: To specify the word data 1234 hex, specify 34 hex first, and then 12 hex. To specify the
double-word data 12345678 hex, specify 78 hex first, then 56 hex and 34 hex, and finally 12
hex. Therefore, set the data as follows in the command format:
Command Format
Example: 16#1234
34
Service Data
Also, data in the CmdDat input variable that inputs the command code is handled in bytes, so set the
command code as follows:
Example: 16#3412
CmdDat[n]
CmdDat[n+1]
• The service data in the response format is also returned with lower bytes (L) first followed by the
higher bytes (H) for word (2-byte) data and double-word (4-byte) data.
Additional Information
• Refer to CompoNet specifications for detailed information on the parameters of explicit mes-
sages.
• Contact the ODVA to obtain copies of the CompoNet specifications.
ODVA's URL: http://www.odva.org/
CJ-series CompoNet Master Unit Operation Manual for NJ-series CPU Unit (Cat. No. W493)
Example: 16#12345678
12 78
Example: 16#78563412
Bytes
34 CmdDat[n]
CmdDat[n+1]
12
CmdDat[n+2]
CmdDat[n+3]
6 Message Communications
56 34 12
Service Data
Bytes
78
56
34
12
6
6-9