Mitsubishi Melsec-L Series User Manual page 78

When the open/close processes are performed from the E71 side using a dedicated instruction, even if "Always wait for
OPEN" has been selected for the Ethernet operation setting, the connection will not return to the open acceptance enable
status after the close process is completed.
(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
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". (
Open/close processes for the connection number 1
Ex.
Open status
Open allowed status (closed)
(Active open acceptance enabled)
Closed status
Initial normal completion
signal X19
OPEN instruction
OPEN instruction
completion device
OPEN instruction
completion device + 1
Open abnormal detection
signal X18
CLOSE instruction
CLOSE instruction
completion device
CLOSE instruction
completion device + 1
Open completion signal
(address: 5000
Open request signal
(address: 5002
76
Page 155, CHAPTER 13)
Parameter
communication
Power-on completed
1
2
)
H
)
H
*1
1 scan
Abnormally
ended
SYN + ACK
3
SYN ACK
Abnormally ended
5
Abnormally
ended
FIN + ACK
4
FIN ACK
1 scan