Message Format - Mitsubishi Electric MELSEC IQ-R series Reference Manual

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
Header Subheader
■Response message (Normal completion: Response data)
Header Subheader
■Response message (Normal completion: No response data)
Header Subheader
■Response message (Abnormal completion)
Header Subheader
Setting data
Set the following items.
Item Description
Header A header of Ethernet. Normally, it is added automatically.
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')
Access route Specify the access route.
Request data Specify the data length from the monitoring timer to the request data.
length
Monitoring timer Set the wait time up to the completion of reading and writing processing.
Request data For the request data, set the command that indicates the request content. Refer to "Request
data" rows of each command.
Response data The data length from an end code to a response data (at normal completion) or an error
length information (at abnormal completion) is stored.
Response data For the response data, store the read data for the command at normal completion. Refer to
"Response data" rows of each command.
End code The command processing result is stored.
Error information Store the information of a station on which an error occurred and information of a command.
Access route Request data length
Response
Access route
data length
Access route Response data length
Specify the number of bytes of the end code.
Response
Access route
data length
Monitoring timer Request data
Specify the number of bytes
in this range.
End code Response data
Specify the number of bytes
in this range.
End code
End code Error information
Specify the number of bytes
in this range.
Reference
Page 42 Header
Page 42 Subheader
Page 45 ACCESS ROUTE SETTINGS
Page 43 Request data length and
response data length
Page 43 Monitoring timer
Page 62 COMMANDS AND
FUNCTIONS
Page 43 Request data length and
response data length
Page 62 COMMANDS AND
FUNCTIONS
Page 44 End code
Page 44 Error information
5 MESSAGES OF ETHERNET INTERFACE MODULE
41
5.2 Message Format
5