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Troubleshooting the Network
Section 4-2
The LED indicators in the upper half of the Slave Status tab shown in the fig-
ure above, indicates the status of the slave devices, by using different colours
(see section
3-7-1 Monitoring the Master Unit and the Network
,
Slave Status
Overview
).
In case an LED indicator is either Red or Orange, additional information can
be obtained from the PROFIBUS Master Unit, by using the mouse pointer to
click on the coloured LED indicator. The basic diagnostics information, for the
selected slave device is retrieved from the Master Unit and displayed in the
lower half of the Slave Status tab. The table below lists the LED indicators,
which are of interest for troubleshooting.
LED Indicator
Description / Correction
Station non-existent
The slave device does not respond to any of the request messages sent by the Master Unit.
• Make sure that the slave device is powered correctly.
• Check the wiring and make sure that the slave device and the Master Unit are connected.
Station not ready
The slave is communicating, but not ready for data transfer.
• 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.
• 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).
Configuration fault
The I/O configuration sent by the Master Unit is rejected by the slave device. The Parameter
request used LED indicator will also be ON.
• Check the selected I/O modules in the Slave DTM. Make sure they match the expected total
I/O number and sequence.
• Consult the operation manual of the slave device. Check if additional modules must be
selected (e.g. empty i/O modules for power modules in a modular slave).