Siemens Simatic CFU, Commissioning Manual

Page: 109 / 220

LED displays on the interface dome of the Compact Field Unit
Table 9-2 Status and error display
LEDs Meaning Solution
PWR
(supply)
RN
(operation)
ER/MT
(error/ main‐
tenance)
On On
Off Good status: The CFU has established
a connection to the IO controller.
Off Off Off No or insufficient supply voltage. Check the supply voltage.
ON ON ON
Startup of the CFU (approx. 5 s) -
* *
ON
Maintenance required (after starting of
the CFU)
Evaluate the diagnostics and elimi‐
nate the error.
(~2 Hz) (~2 Hz) (~2 Hz)
Serious internal error.
All channel LEDs also flash.
Check whether a firmware update is
available and carry out the update. If
the error persists, contact Siemens In‐
dustry Online Support.
ON (~2 Hz) (~2 Hz)
Unsupported BusAdapter Replace the BusAdapter.
ON (~1 Hz) (~1 Hz)
Internal updates are running after a
firmware update (duration: approx. 30
s).
Wait until the update has been com‐
pleted. The CFU subsequently starts
up automatically.
ON Flashes
* No connection to the CPU Wait a few seconds until the connec‐
tion is established.
If the connection is not established,
check the configuration (device name
and IP address of the CFU).
Check the LEDs on the BusAdapter
Flashes Flashes Flashes
Node flashing test -
* *
Flashes
Group fault and group fault channels. Evaluate the diagnostics and elimi‐
nate the error.
Configured structure does not agree
with the actual structure of the CFU .
Check the structure of the CPU wheth‐
er a channel fault or an error at the
fieldbus exists.
Parameter assignment error for PRO‐
FIBUS PA or DIQ.
Evaluate the display of the channels
and fieldbus connections in STEP 7
and eliminate the error.
* *
(~2 Hz)
● Warning limits for fieldbus
connection exceeded
● Service port enabled
Maintenance required
Diagnostics of the CFU
9.2 Diagnostics via LED displays
SIMATIC CFU
Commissioning Manual, 08/2019, A5E39252870-AD
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