Diagnostics Using LEDs
9-5
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
9.2 LED displays of the DP/PA coupler
Table 9-2 Status and error messages of the DP/PA coupler
DP
ON
PA
DP: PROFIBUS-DP bus monitoring (yellow)
PA: PROFIBUS-PA bus monitoring (yellow)
ON: 24V power supply DP/PA coupler (green)
LEDs Meaning What to do
DP PA ON
* * On Power is supplied to the DP/PA coupler.
The DP/PA coupler is ready for
operation.
–
* * Off Voltage not present at DP/PA coupler,
Or
Error in the DP/PA coupler.
Check the 24V power supply to the
DP/PA coupler,
Or
Get in touch with your Siemens partner.
* * Flash
es
PROFIBUS-PA overload Check the number of connected PA
field devices and their total current.
Flash
es
* On PROFIBUS-DP frames are being
received.
–
Off * On PROFIBUS-DP frames are not being
received.
Causes:
The DP master is not in operation.
The bus cable is damaged.
The bus modules are not properly
connected.
Connector for backplane bus is
defective.
Check whether the bus connector is
properly connected.
Check if the interconnecting cable
to the DP master has been
interrupted.
Check whether the bus modules
are properly connected.
Check the 24V power supply to the
DP/PA coupler.
* Flash
es
On PROFIBUS-PA frames are being
received.
–
* Off On PROFIBUS-PA frames are not being
received. For example:
The voltage on the PROFIBUS-PA
is not within the permissible range
(short circuit, overload).
No response from a PA field device.
Possibly the PA field device is not
being addressed.
Check the PA field devices on the
PROFIBUS-PA.
Check whether the bus segments
are properly terminated.
*
Not applicable
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