Comtrol Modbus TCP Quick Start - Manual (Page 76)

76 - Troubleshooting and Technical Support DeviceMaster UP EtherNet/IP Quick Start: 2000478 Rev. D
Troubleshooting and Technical Support
General Troubleshooting
This table illustrates some general troubleshooting tips.
Note: Make sure that you have reviewed the Troubleshooting Checklist on Page 75.
General Condition Explanation/Action
PWR or Status LED
flashing
Indicates that boot program has not downloaded to the
unit.
1. Reboot the system.
2. Make sure that you have downloaded the most
current firmware for your protocol:
ftp://ftp.comtrol.com/html/up_main.htm .
Note: If the PWR or Status LED is still flashing,
contact Technical Support.
PWR or Status LED not
lit Indicates that power has not been applied or there is a
hardware failure. Contact Technical Support.
Cannot ping the device
through Ethernet hub
Isolate the DeviceMaster UP from the network.
Connect the device directly to the NIC in the host
system (see Page 75).
Cannot ping or connect
to the DeviceMaster UP The default IP address is often not accessible due to the
subnet masking from another network unless 192.168 is
used in the network.
In most cases, it will be necessary to program in an
address that conforms to your network.
DeviceMaster UP
continuously reboots
when connected to some
Ethernet switches or
routers Invalid IP information may also cause the switch or
router to check for a gateway address. Lack of a
gateway address is a common cause.