Melsoft Connection Cannot Be Established; Specific Communication Port Cannot Be Opened By A User Application; Communication Error Occurs During Ethernet Communication - Mitsubishi Electric MELSEC iQ-R Series User Manual

34.2

MELSOFT Connection cannot be Established

Check item
Is the port number used for the MELSOFT connection function used by
another application?
Is communication blocked by the security function such as firewall?
Are multiple target devices with different IP addresses connected?
Are a target device (with the same IP address as this product) and this product
connected by using multiple MELSOFT connections (TCP/IP) simultaneously?
Is the READY LED flashing slowly in green by turning the power of this
product OFF and ON or resetting the bus?
Is a TCP/IP connection established from multiple Mitsubishi Electric products?
Is this product communicated from multiple connection destinations
simultaneously?
34.3
Specific Communication Port cannot be Opened
by a User Application
Check item
Is the same port number used for the MELSOFT connection function
specified?
Is communication blocked by the security function such as firewall?
34.4
Communication Error Occurs during Ethernet
Communication
Check item
Does Ethernet communication error occur when idle status (no input operation
by the mouse or keyboard is performed) lasts for 10 minutes after Windows
starts?
Corrective action
Check whether another application uses the same port number used for the
MELSOFT connection function, and restart the MELSOFT connection service
after closing the application. For the port number used for the MELSOFT
connection function, refer to the following:
Page 131 MELSOFT CONNECTION FUNCTION
Allow communication by the Windows firewall or antivirus software being
used.
For the procedure to allow communication by the Windows firewall, refer to
the following:
Page 131 MELSOFT CONNECTION FUNCTION
Add connections in the external device configuration.
Specify the same Ethernet board adapter for the connection destination
settings.
If any MELSOFT products that cannot specify an Ethernet board adapter are
included, specify "Not Specified" for the adapter setting in the connection
destination setting of all MELSOFT products to be connected.
After the READY LED turns ON, reconnect this product and the MELSOFT
product after a while.
• Add settings of the MELSOFT connection in the external device
configuration.
• Reduce the number of connections for products that use the MELSOFT
connection.
• Try again after a while.
• Try again after disconnecting other connections.
Corrective action
Check the port number used for the MELSOFT connection function, and if the
same communication port is used, change the setting so that another port is
used.
For the port number used for the MELSOFT connection function, refer to the
following:
Page 131 MELSOFT CONNECTION FUNCTION
Allow communication by the Windows firewall or antivirus software being
used.
Corrective action
Set the startup type of 'DMWapPushService' in Windows service to automatic.
Due to the specification of Windows 10 IoT Enterprise LTSC 2019,
communication with the connection destination may be temporally interrupted
when the idle status lasts for 10 minutes after Windows starts. This can be
avoided by the Windows service settings.
34 TROUBLESHOOTING BY SYMPTOM
34.2 MELSOFT Connection cannot be Established
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