Status And Error Indicators: Cpu 31Xc - Siemens Simatic S7-300 Technical Data Manual

Operating and display elements
2.1 Operating and display elements: CPU 31xC
2.1.1

Status and Error Indicators: CPU 31xC

LED designation
SF
BF (for CPUs with DP
interface only)
DC5V
FRCE
RUN
STOP
Reference
• CPU operating modes:
• Information on CPU memory reset:
2-4
Color
red
red
green
yellow
green
yellow
Commissioning, Commissioning Modules, CPU Memory Reset by means of Mode
Selector Switch
Evaluation of the LEDs upon error or diagnostic event:
Instructions CPU 31xC and CPU 31x, Test Functions, Diagnostics and Troubleshooting,
Diagnostics with the help of Status and Error LEDs
Meaning
Hardware or software error
Bus error
5-V power for CPU and S7-300 bus is OK
Force job is active
CPU in RUN
The LED flashes during STARTUP at a rate of 2 Hz, and in HOLD
state at 0.5 Hz.
CPU in STOP and HOLD or STARTUP
The LED flashes at 0.5 Hz when the CPU requests a memory reset,
and during the reset at 2 Hz.
STEP 7 Online Help
.
Operating instructions CPU 31xC and CPU31x,
Operating
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05