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DL30-G USERS MANUAL EM-8571-G Rev.2
8.1.12 Modbus/TCP slave
Problem faced
Checks to be done
Method of handling
Unable to connect with
DL30-G from the Modbus
master side.
Is the Modbus/TCP slave function
enabled?
Enable the Modbus/TCP slave function.
➔
Unable to read data.
Are the register type and the ad-
dress of the channel correct?
Check the register type and the address.
➔
Unable to connect via the
router.
Is the port address 502 of the router
used for Modbus/TCP open?
Set the IP address and the port address 502
of DL30-G manually in the NAT setting of the
router.
(Refer to the instruction manual of the router.)
8.1.13 Modbus/TCP master
Problem faced
Checks to be done
Method of handling
Unable to connect to the
Modbus slave device from
the DL30-G.
Is the LAN cable disconnected or
has it come out from the HUB?
Connect the LAN cable securely.
Check the connected lamp on the HUB.
Has the IP address of the DL30-G
been manually set?
Set the IP address manually.
➔
Has the same network address
been specified in the DL30-G and
Modbus slave device?
Check the network address.
[Example]
Paperless recorder: 192.168.0.1
Slave: 192.168.0.2
Subnet mask: 255.255.255.0
Does the IP address of the slave de-
vice coincide with the one registered
on DL30GCFG?
Check the IP address.
➔
Has the IP address been set for the
slave device?
Set the IP address for the slave device.
For M-System remote I/O, disconnect and
restart the power supply after setting the IP
address. (See the respective remote I/O User
Manuals for information on the method of setting
the IP address)
Have you replaced the network
module?
When the Modbus/TCP network module in the
remote I/O is replaced, it may take time to con-
nect.
In order to connect immediately, disconnect and
restart the power supply to the DL30-G.