Mitsubishi Electric QJ71E71-100 User Manual page 87

(1) Initial Timing
This setting configures the open timing of the connection where "TCP" (Passive open) or "UDP" has been
selected under "Open System" in the open setting. (
(a) Do not wait for OPEN (Communications impossible at STOP time)
Connections are opened or closed using a program. Communications cannot be performed while the switch on
the CPU module is set to STOP.
(b) Always wait for OPEN (Communication possible at STOP time)
Connections always wait for the open status according to the "Open System" parameter. (This eliminates the
need to open/close connections using a program.
CPU module is set to STOP.
*1 If the program of the CPU module on the own station closes a connection, the station does not enter the OPEN request
wait status after the connection is disconnected.
When remotely controlling the CPU module from a connected device, select "Always wait for OPEN (Communication
possible at STOP time)". If "Do not wait for OPEN (Communications impossible at STOP time)" is selected, the
communication line is closed during remote STOP. After the line is closed, the line cannot be reopened on the CPU module
side, and remote RUN cannot be performed from the connected device.
(2) IP address setting
Set the IP address of the own station so that it has the same class and subnet address as that of the connected
device to be communicated.
When a subnetwork is not used
Ex.
• IP address of the own station: 129.5.1.1
• IP address of the connected device: 129.5.47.1
• Subnet mask of the connected device: None
In the above case, the IP address of the connected device is class B.
Since class B has a default subnet mask of 255.255.0.0, set the IP address of the own station so that the first and
second octets are the same as those of the connected device.
When a subnetwork is used
Ex.
• IP address of the own station: 129.5.47.5
• IP address of the connected device: 129.5.47.1
• Subnet mask of the connected device: 255.255.255.0
In the above case, although the IP address of the connected device is class B, the first to third octets are the
subnet address because the subnet mask is set to the first to third octets.
Therefore, set the IP address of the own station so that the first to third octets are the same as those of the
connected device.
Remark
● The IP address pattern for each class is as follows.
Class A: 0.x.x.x to 127.x.x.x, Class B: 128.x.x.x to 191.x.x.x, Class C: 192.x.x.x to 223.x.x.x
● The host address for each class is the part shown with "0".
Class A: 255.0.0.0, Class B: 255.255.0.0, Class C: 255.255.255.0
CHAPTER 7 COMMUNICATION PROCEDURE
Page 86, Section 7.1.4)
*1
) Communications can be performed while the switch on the
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