Led Displays - Siemens SINUMERIK 840D sl Manual

5.3

LED displays

Table 5-1 Meaning of LED states
Name Function
RDY Ready
RUN PLC RUN
STOP PLC STOP
SU/PF PLC FORCE
SF PLC SF
DP1 BUS1 F
DP2 BUS2 F
OPT *) BUS3 F
*) 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 starting up, all LEDs are illuminated yellow for a brief time. You can
carry out a detailed diagnosis using a PG/PC and the HMI software.
Additional references
You can find a detailed description of LED states in Chapter 10 of the:
S7-300 CPU 31xC and CPU 31x Operating Instructions: Configuring
NCU
Manual, 07/2007, 6FC5397-0AP10-2BA0
Status Meaning
Red There is at least one fault (e.g. RESET, watchdog monitoring etc. ) or
the Control Unit is booting up.
Flashing red/yellow Error accessing CompactFlash Card
(0.5 Hz)
Yellow Accessing CompactFlash Card
Green PLC ready to operate
Yellow PLC stopped
Red FORCE activated
Red PLC group error
Red PROFIBUS-DP1 group error
Red PROFIBUS-DP2 group error
Off The PROFINET system runs correctly; data exchange to all
configured IO devices runs.
Red •
•
Flashing red
•
(2 Hz)
•
Bus fault (no physical connection)
Incorrect transmission rate
Failure of a connected I/O device.
Incorrect or no configuration.
Operating and display elements
5.3 LED displays
39