Diagnostics With The Cp 440; Diagnostics Functions Of The Cp 440 - Siemens SIMATIC S7-400 Equipment Manual

Diagnostics with the CP 440

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 (see chapter "Diagnostics via the display elements of the CP 440 (Page 96)").
The special LEDs, TXD and RXD give you information on the state of the send and receive lines.
The chapter "Firmware updates (Page 69)" provides information on other LED indicators that
occur when loading a firmware update.
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 (see chapter "Diagnostics Messages of the Function Blocks (Page 97)").
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 user-relevant information of the CP
diagnostic buffer (see chapter "Diagnostics via the diagnostic buffer of the CP 440 (Page 104)").
Point-to-point connection CP 440 Installation and Parameter Assignment
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