Mitsubishi Electric MELSEC-L Series - Page 83

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CHAPTER 7 COMMUNICATION PROCEDURE
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7.3 UDP/IP Communications 7.3.2 Open procedure
(2) When "Do not wait for OPEN (Communications impossible at STOP time)" is
selected for the Ethernet operation setting
Executing the OPEN/CLOSE instructions is required on the E71 to make the E71 enter open/close wait status
open/close wait status before receiving an open/close request from the connected device. When the open
process is normally completed, data sending and receiving are enabled. For the OPEN/CLOSE instructions, refer
to "DEDICATED INSTRUCTIONS".
( Page 196, CHAPTER 15)
Ex.
Open/close processes for the connection number 1
After parameter communications, check that the initial process of the E71 is normally completed.
(Initial normal completion signal (X19): ON)
Start the open process using the OPEN instruction. (Open request signal (address: 5002
H
(b0)): ON)
The E71 performs the open process. (Internal process only)
Data communications are enabled when the open process is normally completed.
Start the close process using the CLOSE instruction. (Open request signal: OFF)
The E71 performs the close process. (Internal process only)
When the close process is normally completed, data communications terminate.
1
2
5
3 4 6 7
Open status
Open allowed status (closed)
Closed status
Initial normal completion
signal X19
OPEN instruction
OPEN instruction
completion device
OPEN instruction
completion device + 1
CLOSE instruction
CLOSE instruction
completion device
CLOSE instruction
completion device + 1
Open completion signal
(address: 5000
H)
Open request signal
(address: 5002
H)
Internal process Internal process
1 scan
1 scan
Power-on
Parameter
communication
completed
Abnormally ended
Abnormally
ended
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2
3
4
5
6
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