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Troubleshooting the Network
Section 4-2
Extended diagnostics
received
The slave device has returned extended diagnostics information. This does not necessarily indi-
cate a malfunction. The Master DTM does not display the extended diagnostics returned by a
slave device. Open the associated Slave DTM to check on the contents of the extended diag-
nostis.
Function not supported
The Master Unit has sent a message to the slave device, which is not supported by that device.
Invalid slave response
This bit is set by the Master Unit if the slave has returned an invalid response to a master
request message.
Parameter fault
The parameters sent by the Master Unit are rejected by the slave device. The Parameter
request used LED indicator will also be ON.
• Check the common parameter settings in the Slave DTM. Make sure the parameters are
within range, and match the physical configuration of the slave device.
• Consult the operation manual of the slave device. Check if additional parameters must be
selected (e.g. parameters associated with selected I/O modules).
Master lock
The slave device is parameterized and locked by another Master Unit on the network. The
Parameter request used LED indicator will also be ON.
• Remove the slave device from either one of the two Master Units on the network.
• Switch off the other Master Unit.
Parameter request used The slave device is not in I/O data exchange with the Master Unit and has requested new
parameters.
• Check the parameters and the I/O configuration for the slave device and make sure they are
correct (Check the Parameter fault, Configuration fault and Master Lock LED indicators).
Static diagnostics
The slave device is sending static diagnostics, and is not exchanging I/O data. This usually indi-
cates a problem at the slave device which prevents it from reading its inputs or setting its out-
puts.
• Check the slave device and make sure that it is working properly.
• Check any loose modules, in case the slave device is a modular device.
• Check the wiring of the I/O at the slave device. Slaves can often detect short-circuits on their
physical I/O.
• Consult the operation manual of the slave device. Check if additional action must be taken to
initiate I/O data exchange (e.g. reset the device after a malfunction).
Station type
This LED indicator only indicates the device type (i.e. slave device) and does not indicate a
problem.
Watchdog On
This LED indicator only indicates that the Watchdog has been enabled at the slave device and
does not indicate a problem.
Freeze mode
This LED indicator only indicates the slave device has received a Global-Control Freeze com-
mand and does not indicate a problem.
Sync mode
This LED indicator only indicates the slave device has received a Global-Control Sync com-
mand and does not indicate a problem.
Slave deactivated
This LED indicator indicates the slave device has been disabled in the Master Unit and does not
indicate a problem.
Extended diagnostics
overflow
The slave device has more diagnostics to report than it can hold in its buffer. This is usually an
indication for problems.
• Check the slave device’s extended diagnostics information. Open the associated Slave DTM
to check on the contents of the extended diagnostics, if this has been returned.
• Check the slave device and make sure that it is working properly.
• Check any loose modules, in case the slave device is a modular device.
• Check the wiring of the I/O at the slave device. Slaves can often detect short-circuits on their
physical I/O.
• Consult the operation manual of the slave device. Check if additional action must be taken to
initiate I/O data exchange (e.g. reset the device after a malfunction).
LED Indicator
Description / Correction
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