Point-to-point connection CP 440 Installation and Parameter Assignment
Manual, 09/2007, A5E00057742-03
115
Diagnostics with the CP 440
8
8.1 Diagnostics Functions of the CP 440
Introduction
The diagnostics functions of the CP 440 enable you to quickly localize any errors which
occur. The following diagnostics options are available:
● Diagnostics via the display elements of the CP 440
● Diagnosis via the STATUS output of the function blocks
● Diagnostics via the diagnostic buffer of the CP 440
Display elements (LEDs)
The display elements show the operating mode or possible error states of the CP 440. The
display elements give you an initial overview of any internal or external errors as well as
interface-specific errors.
The special LEDs, TXD and RXD give you information on the state of the send and receive
lines.
STATUS output of the FBs
The function blocks FB SEND_440, FB RECV_440 and RES_RECV have a STATUS output
to indicate an error diagnosis. Reading the STATUS output of the function blocks gives you
information on errors which have occurred during communication. You can interpret the
STATUS output in the user program.
The CP 440 also enters the diagnostic events at the STATUS output in its diagnostic buffer.
Diagnostic Buffer of the CP 440
All the CP 440's errors are entered in its diagnostic buffer.
In the same way as with the diagnostic buffer of the CPU, you can also use the STEP 7
information functions on the programming device to display the information in the CP
diagnostic buffer.
See also
Diagnostics Messages of the Function Blocks (Page 117)
Diagnostics via the display elements of the CP 440 (Page 116)
Diagnostics via the diagnostic buffer of the CP 440 (Page 125)
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