18 COMMUNICATING USING 1E FRAMES
18.1 Message Format
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18 COMMUNICATING USING 1E FRAMES
This chapter explains the functions when accessing using 1E frame and their message format.
1E frame is compatible with the communication function supported by MELSEC-A series Ethernet interface modules.
Only the commands for 1E frame explained in this chapter can be used for 1E frame.
18.1 Message Format
This section explains the message format when communicating data using 1E frame.
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.
18.2 Details of Setting Data
This section explains how to specify the common data items and their content in each message.
Item Description Reference
Header A header of Ethernet. Normally, it is added automatically. Page 392 Header
Subheader Set the command type. Page 392 Subheader
PC No. Specify the network module station No. of an access target. Page 393 PC No.
ACPU monitoring
timer
Set the wait time up to the completion of reading and writing processing. Page 394 ACPU monitoring timer
Request data Set the commands that indicates request content. Page 397 Read and Write Device Memory
Page 418 Read and Write Extended File Register
Page 432 Read and Write Buffer Memory of Special
Function Module
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
Abnormal code
The command processing result is stored. Page 395 End code, Abnormal code
Header Subheader PC No.
ACPU monitoring
timer
Request data
Header Subheader End code Response data
End code Abnormal code
Header Subheader
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