Mitsubishi MELSEC-F User Manual page 129

6 FIXED BUFFER COMMUNICATION (WITH THE PROCEDURE EXIST
CONTROL METHOD)
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1) Confirm the normal completion of the open processing of connection
No. 2.
2) Upon receiving data from the designated external device (set in the
open processing), the Ethernet module processes the following.
• Stores the received data to the fixed buffer (No. 2) area.
Receive data length
Receive data
• Fixed buffer receive status signal (BFM#20485 b1)
• Fixed buffer communication receive result (BFM#1611) : 0001
3) Execute the FROM instruction to read the received word length and
received data to the PLC.
4) Execute the TO instruction to write "0002
communication receive result (BFM#1611).
5) Return "Response" to communication destination.
6) The receive processing is performed.
At normal completion
• Fixed buffer transmission results (BFM#1611)
At abnormal completion
• Fixed buffer transmission results (BFM#1611)
POINT
(1) The destination setting (see Section 5.5) for a connection whose parameters
are set with FX Configurator-EN (GX Developer) becomes valid when the
open completion signal (BFM#20480... corresponding bit) of the Ethernet
module switches from off to on.
(2) Execute data receiving process when the corresponding connection's bit in
the fixed buffer receive status signal storage area (BFM#20485) of the buffer
memory switches from off to on or when the value "0001
fixed buffer communication receive results (BFM#1610 to #1617).
(3) At abnormal data receiving, each buffer memory status is shown in the
following.
(For connection No. 2)
• The fixed buffer receive completion signal (BFM#20485 b1) remains off.
• The fixed buffer communication receive result (BFM#1611) remains
"0008 ".
H
• Data is not stored in the fixed buffer (No.2) area.
: The head address area of the target fixed
address
: Area beginning from the head address of
the target fixed buffer + 1
" in the fixed buffer
H
" is stored in the
H
MELSEC-F
: ON
H
: 0004
H
: 0008
H
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