Digital Modules
3-13
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Reading out diagnostic messages
You can read out detailed diagnostic messages by means of SFCs in the user
program (refer to the Appendix “Diagnostic Data of Signal Modules”).
You can view the cause of the error in STEP 7, in the module diagnosis (refer to
online Help for STEP 7).
Diagnostic message by means of SF LED
The digital modules with diagnostics capability indicate errors for you by means of
their SF LED (group error LED). The SF LED lights as soon as a diagnostic
message is triggered by the digital module. It goes out when all errors have been
rectified.
The group fault (SF) LED also lights up in case of external errors (short circuit of
sensor supply), independent of the operating status of the CPU (if power is on).
Diagnostic messages interrupt processing by the digital modules
You will find the diagnostic messages with their possible causes and remedial
action, together with a description of possible interrupts in the specific section on
the module.
3.5 Digital Input Module SM 321; DI 32 x VDC 24;
(6ES7321-1BL00-0AA0)
Order number: “Standard module”
6ES7321-1BL00-0AA0
Order number: SIPLUS S7-300 Module
6AG1321-1BL00-2AA0
Characteristics
The digital input module SM 321; DI 32 x 24 VDC has the following salient
features:
• 32 inputs, isolated in groups of 16
• 24 VDC rated input voltage
• Suitable for switches and two / three / four-wire BEROs (proximity switches).
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