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Intelligent Technologies Modbus to QCPort Adapter Manual
January 2006
MN05002002E (C)
For more information visit
www.eatonelectrical.com
Page 56
Troubleshooting
Use the following chart for assistance in troubleshooting the Modbus Adapter; the chart
contains the most common faults and corrective actions.
Table 58: Troubleshooting Chart
Observation Possible
Cause/Action
None of the LEDs are
illuminated
Verify that power (24 VDC) is applied to the Modbus
terminal and that power is on the QCPort channels.
Verify that all devices on the QCPort ports are set to
unique addresses.
Verify that you are holding the Configure button for the
required 5 seconds
IO Configuration will not
complete
Power cycle the Modbus Adapter and QCPort devices.
The data in the Modbus
input assembly is all zero’s
Verify that the Scan Active bit in the Modbus register
2049, 2050 or 1025 is set to one.
Cant auto configure QCPort
or cant see any devices on
QCPort
Verify that QCPort has a biasing resistor installed such as
the D77E-QPLR or the D77E-TERRJ.
Unit ID
1 (always 1 but can be changed)
IP Lost
Use Studio to rediscover the device
Power Up Reset
Not scanning
Is scan enabled in register 1025
Controller cant see after
setting IP address
Check subnet mask
Can communicate over
Serial Modbus RS485
Verify valid range, 1 – 246