Status And Fault Displays Of The Cpus - Siemens SIMATIC S7-300 Series Reference Manual

1.1.1 Status and Fault Displays
Displays for the CPU:
SF ... (red) ...hardware/software error
BATF ... (red) ...battery error (not CPU 312 IFM)
DC5V ... (green) ... 5V DC supply for CPU and S7-300 bus is ok.
FRCE ... (yellow) ...force job is active
RUN ... (green) ... CPU in RUN mode; LED flashes at start-up with 1 Hz; in HALT mode with 0.5 Hz
STOP ... (yellow) ... CPU in STOP/HALT or STARTUP mode;
LED flashes on request to reset memory
Displays for the PROFIBUS:
CPU 315-2 DP/
BUSF ... (red) ... hardware or software fault at PROFIBUS interface
CPU 316-2 DP
CPU 318-2 BUS1F ... (red) ... hardware or software fault at interface 1
BUS2F ... (red) ... hardware or software fault at interface 2
Figure 1-2

Status and Fault Displays of the CPUs

PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
CPUs
1-3