Intelligent Technologies Modbus to QCPort Adapter Manual
January 2006
MN05002002E (C)
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Page 69
Appendix D Modbus Adapter Fault List
Hard – Solid Red MS LED (Major Fault)
Medium – Flashing Red MS LED (Recoverable Fault)
Soft – Flashing Green MS LED (Minor Fault)
Register 2305 (holding register area)
Bit
Fault
Fault Name
Type
Fault Description
0
Reserved
1 1 Interdevice
comm. failure
Hard
Processor unable to communicate with Ethernet.
This could be caused by extreme noise, esd or
eft. Try removing potential problems and cycle
power to the D77D-EMA. Ultimately this may
mean that the circuit board is faulty.
2 2 TCP
Poll
Timeout
Medium
A TCP connection has timed out. This may
mean that no traffic has occurred on the
connection for a long time, or that the Ethernet
cable has been disconnected. Logical
connections which are not properly terminated
can result in “half open connections”. Half open
connections actually use up a connection on the
D77D-EMA and can result in no resources being
left to connect to. Check Ethernet physical
connections and attempt to re-connect using a
client tool. If no connections can be obtained,
cycle power to the D77D-EMA to clear all logical
connections.
3 3 Serial
Modbus
RS485 ID
Fault
Medium
Modbus dip switches are set illegally. Either 0 or
a number greater than 247 has been selected on
the D77D-EMA. Select a valid Modbus ID and
cycle power to the D77D-EMA.
4-6
Reserved
7 7 NV
Flash
Fault
Hard
The non-volatile flash data check failed. Stored
data may be corrupted. D77D-EMA should be
power-cycled. If the fault still exists the D77D-
EMA should be totally re-configured.
8-11
Reserved
12
12
Phantom ISR
Hard
An unexpected interrupt occurred.
13-15
Reserved
