Mitsubishi Electric MELSEC iQ-R Series - Message Format

5 MESSAGES OF ETHERNET INTERFACE MODULE
5.2 Message Format
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5.2 Message Format
This section explains the message format and setting data for 4E frame and 3E frames.
For the message format for 1E frame, refer to the following section.
Page 391 Message Format
Message format
■Request message
■Response message (Normal completion: Response data)
■Response message (Normal completion: No response data)
■Response message (Abnormal completion)
Setting data
Set the following items.
Item Description Reference
Header A header of Ethernet. Normally, it is added automatically. Page 42 Header
Subheader The value to be set according to type of message is defined.
• 4E frame: Set a serial No.
• 3E frame: Fixed value (Request message '5000', Response message 'D000')
Page 42 Subheader
Access route Specify the access route. Page 45 ACCESS ROUTE SETTINGS
Request data
length
Specify the data length from the monitoring timer to the request data. Page 43 Request data length and
response data length
Monitoring timer Set the wait time up to the completion of reading and writing processing. Page 43 Monitoring timer
Request data For the request data, set the command that indicates the request content. Refer to "Request
data" rows of each command.
Page 62 COMMANDS AND
FUNCTIONS
Response data
length
The data length from an end code to a response data (at normal completion) or an error
information (at abnormal completion) is stored.
Page 43 Request data length and
response data length
Response data For the response data, store the read data for the command at normal completion. Refer to
"Response data" rows of each command.
Page 62 COMMANDS AND
FUNCTIONS
End code The command processing result is stored. Page 44 End code
Error information Store the information of a station on which an error occurred and information of a command. Page 44 Error information
Header Subheader Access route Request data length Monitoring timer Request data
Specify the number of bytes
in this range.
Header Subheader Access route
Response
data length
End code Response data
Specify the number of bytes
in this range.
Header Subheader
Access route Response data length
End code
Specify the number of bytes of the end code.
Header Subheader Access route
Response
data length
End code Error information
Specify the number of bytes
in this range.