Siemens Simatic S7-300 Instrukcja Obsługi Pobierz pdf (Strona 61)

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Digital modules

3.4 Diagnostics of digital modules

S7-300 Module data

Manual, 02/2013, A5E00105505-08

Reading diagnostics messages

You can read detailed diagnostics messages using SFCs in the user program (refer to the

appendix Diagnostics data of signal modules (Page 609)).

In STEP 7, you ca

n view the cause of error by reading the module diagnostics data (refer to

the STEP 7 Online Help.)

Diagnostics message using the SF LED

Digital modules with diagnostics function indicate errors at their SF LED (group error LED.)

The SF LED lights up when the digital module generates a diagnostics message. It goes

dark after all error states are cleared.

The SF LED also lights up to indicate external errors (short-circuit at the sensor supply),

regardless of the CPU operating state (at POWER ON.)

Diagnostics messages and interrupt processing of digital modules

For information on diagnostics messages, their possible causes, troubleshooting measures,

and possible interrupts refer to the specific module chapter.

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