Overview of 10 explanatory materials for the CPU alarm indicator light of Siemens S7-400PLC

1. BUSF: • Not lit when normal • Lit: indicates bus failure (physical failure), DP interface failure, different transmission rates in multi-DP master mode • Flashing indicates station failure or at least one assigned slave station cannot be addressed

2. RUN: On, it indicates that the CPU is running.

3. STOP: On indicates that the CPU is in a stop state.

4. INTF: On, it indicates that an internal error (programming or parameter assignment error) is detected or the CPU is executing CiR.

5. EXTF1: On indicates that an external error has been detected (in other words, the cause of the error is not on the CPU module).

6.FRCE: On indicates that the forced job has been activated.

7. BUS1F: On, it indicates that an error has been detected on the MPI/DP interface.

8. BUS2F: On indicates that an error has been detected on the PROFIBUS DP interface.

9. IFM1F: On, it indicates that an error has been detected on the interface 1 of the memory submodule.

10. IFM2F: On, it indicates that an error has been detected on the interface 2 of the memory sub-module.

Overview of 10 explanatory materials for the CPU alarm indicator lamp of Siemens S7-400PLC

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