Diagnostics with the CP 341
8.1 Diagnostics Functions of the CP 341
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
186 Manual, 09/2008, A5E02191071-01
Diagnostic interrupt
The CP 341 can trigger a diagnostic interrupt on the CPU assigned to it. CP 341 provides
4 bytes of diagnostics information at the S7–300 backplane bus. This information is analyzed
via the user program (OB 82) or using a programming device to read from the CPU
diagnostic buffer.
The CP 341 also writes diagnostic events which have triggered a diagnostic interrupt to its
diagnostic buffer .
When a diagnostics alarm event occurs, the SF LED (red) lights up.
8.1.1 Diagnostics via the display elements of the CP 341
The display elements of the CP 341 provide information on the CP 341. The following
display functions can be distinguished:
● Group error displays
– SF (red) Error has occurred or parameter reassignment is in progress.
● Special displays
– TXD (green) Sending active; lights up when the CP 341 is sending user data via the
interface
– RXD (green) Receiving active; lights up when the CP 341 is receiving user data via
the interface
Note
Section "Subsequent Loading of Firmware Updates (Page 123)" provides information
on other LED indicators that occur when loading a firmware update.
Group error display SF
The group error display SF always lights up after POWER ON and goes out after
initialization. If configuration data has been generated for the CP 341, the SF LED again
lights up briefly during parameter reassignment.
The group error display SF lights up whenever the following occur:
● Hardware fault
● Firmware error
● Parameter assignment error or no parameter assignment exists
● BREAKs (receive cable between CP 341 and communications partner becomes
disconnected)
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