Application Data Specification Items - Mitsubishi Electric MELSEC iQ-F Series FX5 User Manual

Application data specification items

This section describes the data contents and the specification method of common data items in the application data in each
message when performing the data communication using the 3E frame.
Request destination network number and request destination station number
■Request message
Header
Subheader
destination
■Response message
Header
Subheader
destination
Specify the request destination network number and request destination station number to be used as an access destination
in hexadecimal.
Specify the request destination network number and request destination station number according to installation conditions of
access destination stations based on the following table.
Data of the response message is a value set in the request message.
No. Access destination
*1
1 Connecting station
(Within the range indicated in No.
1 in the figure below)
2 Other stations or relay station
(Within the range indicated in No.
2 in the figure below)
3 Multi-drop connecting station via
network
(Within the range indicated in No.
3 in the figure below)
*1 Please use specification No.1 to access FX5CPU.
External device
Ethernet
No. 1
3 MESSAGE FORMAT
22
3.1 Message Format
Request Request Request
destination destination
network station No. module I/O
No. No.
Application data
Request Request Request
destination destination
network station No. module I/O
No. No.
Station to be specified

(Specify the fixed value indicated
on the right)
Access destination station
A station on the network where
multi-drop connecting stations are
connected
(In the figure below, [A] is
specified)
Another station
Connecting
station
Network
No. 1
Another station
Application data
Request Request Reserve Command Subcommand Request
destination data
multidrop length
station No.
Request Response End
destination data length code
multidrop
station No.
Request destination
network number
00H
01 to EFH (1 to 239)
01 to EFH (1 to 239)
Another station
Relay
station
Network
No. n
Another station
No. 2
data
Response
data
Request destination station
number
FFH
01 to 78H (1 to 120): Station
number
7DH: Assigned control station/
Master station
7EH: Present control station/
Master station
01 to 78H (1 to 120): Station
number
7DH: Assigned control station/
Master station
7EH: Present control station/
Master station
Multi-drop connection
Multi-drop Multi-drop
connecting connecting
station station
A
MELSEC iQ-R
series etc.
No. 3
Multi-drop
connecting
station