Description
3.4 Operating and display elements
NCU 7x0.2
Manual, 02/2011, 6FC5397-0AP20-0BA0
25
3.4.2 LED displays
Table 3- 1 Meaning of LED states
Name Function Status Meaning
Red There is at least one fault (e.g. RESET, watchdog
monitoring etc. ) or the Control Unit is booting up.
Flashing red/orange
(0.5 Hz)
Error accessing CompactFlash Card
Orange Accessing CompactFlash Card
Flashing orange (0.5 Hz) Updating the firmware of the connected DRIVE-CLiQ
components
Flashing orange (2 Hz) Firmware update is complete for components. Wait for
POWER ON for the components in question.
Green NC powered up and everything in cyclic mode
RDY Ready
Flashing green/orange or
red/orange (1 Hz)
LED-supported recognition of connected DRIVE-CLiQ
component is activated: (p0124[0] = 1).
RUN PLC RUN Green PLC ready to operate
STOP PLC STOP Orange PLC stopped
SU/PF PLC FORCE Red FORCE activated
SF PLC SF Red PLC group error
DP1 BUS1 F Red PROFIBUS-DP1 group error
DP2 BUS2 F Red PROFIBUS-DP2 group error
OPT *) BUS3 F Off The PROFINET system runs correctly; data exchange to all
configured IO devices runs.
Red
Bus fault (no physical connection)
Incorrect transmission rate
Flashing red
(2 Hz)
Failure of a connected I/O device.
Incorrect or no configuration.
*) The "OPT" LED is only significant for "PN NCUs".
NOTICE
If all the LEDs are flashing, the PLC must be reset via the mode selector (move switch to
position "3" to reboot).
Note
While the Control Unit is powering up, all LEDs briefly light up orange. You can carry out a
detailed diagnosis using a PG/PC and the operating software.
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