Mitsubishi Electric MELSEC-L SERIES Basic User Manual page 83

(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)
Open/close processes for the connection number 1
Ex.
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
After parameter communications, check that the initial process of the E71 is normally completed.
1
(Initial normal completion signal (X19): ON)
Start the open process using the OPEN instruction. (Open request signal (address: 5002
2
The E71 performs the open process. (Internal process only)
3
Data communications are enabled when the open process is normally completed.
4
Start the close process using the CLOSE instruction. (Open request signal: OFF)
5
The E71 performs the close process. (Internal process only)
6
When the close process is normally completed, data communications terminate.
7
Parameter
communication
Power-on completed
1
2
3
CHAPTER 7 COMMUNICATION PROCEDURE
1 scan
Abnormally ended
5
4 6
Internal process Internal process
7
1 scan
Abnormally
ended
7
(b0)): ON)
H
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