Digital modules
3.4 Diagnostics of digital modules
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
3-9
3.4 3.4 Diagnostics of digital modules
Introduction
The information provided in this chapter applies only to S7-300 digital modules with
diagnostics functions.
● Digital input module SM 321; DI 16 x DC 24 V, with hardware and diagnostic interrupts,
isochronous; (6ES7321-7BH01-0AB0)
● Digital output module SM 322; DO 16 × UC 24/48 V (6ES7322-5GH00-0AB0)
● Digital output module SM 322; DO 8 x DC 24 V/0.5 A, with diagnostic interrupt;
(6ES7322-8BF00-0AB0)
● Digital output module SM 322; DO 8 x AC120/230 V /2A ISOL (6ES7322-5FF00-0AB0)
● Relay output module SM 322; DO 8 x Rel. AC230V /5A (6ES7322-5HF00-0AB0)
Programmable and non-programmable diagnostic messages
We distinguish between programmable and non-programmable diagnostic messages.
You only obtain programmable diagnostic messages if you have enabled diagnostics at the
relevant parameters. Program the "Diagnostics" parameter block in STEP 7.
Digital modules always return non-programmable diagnostic messages, irrespective of
diagnostics being enabled.
Reactions to diagnostic message in STEP 7
Actions initiated by diagnostic messages:
● The diagnostic message will be entered in the diagnostics data of the digital module, and
is then passed to the CPU.
● The SF LED on the digital module is lit.
● When "Enable Diagnostic Interrupt" is set in STEP 7, the system triggers a diagnostic
interrupt and calls OB82.
Reading diagnostic messages
You can read detailed diagnostic messages using SFCs in the user program (refer to the
appendix "Diagnostic data of signal modules").
In STEP 7, you can view the cause of error by reading the module diagnostics data (refer to
the STEP 7 Online Help.)
Diagnostic 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 diagnostic message. It goes dark
after all error states are cleared.
The SF LED also lights up to indicate external errors (short-circuit at the encoder supply),
regardless of the CPU operating state (at POWER ON.)
Diagnostic messages and interrupt processing of digital modules
For information on diagnostic messages, their possible causes, troubleshooting measures,
and possible interrupts refer to the specific module chapter.
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