Mitsubishi MELSEC-F User Manual page 76

5 COMMUNICATION PROCEDURE
When receiving communication request data from an external device
PLC
Receive completion signal
Receive data acquisition
processing
Receive data normal
completion BFM operation
5
Device memory, etc.
Data
5 - 2
NOTE
Each of the following two types of communication can be performed with an external
device opened by the user.
• Communication using MC protocol
• Sending/receiving in fixed buffer communication (procedure exists)
Ethernet module
Fixed buffer communication
Store data
(Procedure exists)
received
(communication)
* For receiving when the
communication is open
Communication using
the MC protocol
(read/write)
(Subheader code)
60
H
Request from an external
E0
H
device (receive)
OS
Confirm the
request contents
with the
subheader.
Head
00 to 05
H H Response to the request (send)
13 to 16
H
80 to 85
H H
93 to 96
H
MELSEC-F
Header
Header
Head
5 - 2