Siemens SIMATIC User Manual

Digital modules
3.4 Diagnostics of digital modules
S7-300 Module data
60 Manual, 06/2017, A5E00105505-AJ
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.

Siemens SIMATIC Specifications

General

Product type designation	SIMATIC
CPU	Varies by model
Memory	Varies by model
Input/Output	Varies by model
Communication	Varies by model
Programming Language	STEP 7
Operating Temperature	0°C to 60°C (varies by model)
Protection Class	IP20
Category	Programmable Logic Controller (PLC)