Mitsubishi Electric QJ71E71-100 User Manual page 224

*1 The settings of the auto-open UDP port and MELSOFT application transmission port (UDP) are enabled when the
following conditions are satisfied. When the following conditions are not satisfied, the system switching request is not
issued even if a communication error occurs in the target connection.
• The remote password setting is enabled.
• The remote password is unlocked.
*2 Do not set the connection with any of the following settings as the target connection. If set, the system may be
consecutively switched in the redundant system if a communication error occurs due to cable disconnection or power-off
of the connected device.
• "Initial timing" in the Ethernet operation setting: "Always wait for OPEN (Communication possible at STOP time)"
• "Protocol" in the open setting: "UDP"
• "Existence confirmation" in the open setting: "Confirm"
*3 It is recommended that the connection set to "MELSOFT connection" under "Open system" of the open setting is not set
as the target connection. Doing so may set all the MELSOFT products connected to the network as the target
connections, therefore; the connected device (target MELSOFT product) cannot be specified.
● When using a redundant system in the backup mode, set the mode of the system B same as that of the system A. If the
mode differs between them, an error will occur in the Redundant CPU.
● Configure "Cable disconnection timeout setting" from several seconds to several ten seconds. If the value is shorter than
that, a system switching request may occur due to such as noise.
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