Siemens SIMATIC S5-95F - Error Indicator on the S5-95 F Basic Unit

Error Diagnosis and Elimination S5-95F
15.1.5 Error Indication
An error is indicated when the S5-95F makes an entry in system event data block DB254 and the
system responds accordingly (i.e. with STOP or passivation).
15.1.6 System Event DB and OB37
The S5-95F enters every error it detects into system event data block DB254. The reason for an
entry might be an error or a system message. You should evaluate the entry in system event data
block DB254 (with the COM 95F software or in your application program) and flag it as required.
Each entry in system event data block DB254 invokes the error response OB (OB37).
15.2 Error Indicator on the S5-95F Basic Unit
The base unit is equipped with a yellow error LED. The operating system sets this LED as soon as
an error has been flagged in the system event DB. If the entry in the system event DB is not
indicative of an error, e.g. "SINEC L1 o.k." or "SINEC L1 data path passivated", the operating
system does not set the error LED.
The LED remains set
• In Test mode until the PLC once again goes from STOP to RUN
• In Safety and Quasi-Safety mode until the next STOP/POWER OFF/POWER ON/RUN sequence
• Until it is reset in the user program via FB255
Figure 15-1. LEDs
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SIMATIC S5-95F
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Evaluate the system event data block (DB254) when the yellow error LED flags an error.
15-2 EWA 4NEB 812 6210-02