Festo CPX-FB13, Manual

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5 Diagnostics and error handling
Festo – P.BE-CPX-CTEL-EN – 1411a – English 45
5.2 Diagnostics/error messages
Note
A requirement for transmission of diagnostic/error messages (if supported by the re­
spective fieldbus) is an existing connection to the host system (
è
3.6) and a corres­
ponding parameterisation of the CTEL master module (
è
4.6).
In the operating mode “Automatic configuration” without connected devices (0I/0O),
no diagnostic/error messages can be transmitted to the bus node. The diagnostic dis­
play in this case takes place locally through the LEDs.
5.2.1 Priorities of the diagnostics/error messages
The CTEL master module differentiates between 5 different instances ( 4 I-ports) that can
cause the diagnostics/error messages.
The instances have different priorities in the CPX system. If several diagnostics/error messages cannot
be displayed parallel to each other on the fieldbus side, the error message with the highest priority is
displayed.
Priority Error instance Description
Highest System Error in the CTEL master module
I-port 1 Error in the module at I-port 1
I-port 2 Error in the module at I-port 2
I-port 3 Error in the module at I-port 3
Lowest I-port 4 Error in the module at I-port 4
Tab. 5.2 Priorities of the error instances
The error instances of the I-ports are assigned standard to the outputs. If no outputs are
intended in the configuration of the CTEL master module, the error instances are assigned
to the inputs.
In the CPX terminal, the individual modules also have prioritisation. This runs from the
CPX bus node (always completely to the left) descending to the right. Modules that are
closer to the bus node thus have a higher priority than modules that are further to the
right.
Within a CPX terminal, diagnostics/error messages with reference to inputs have priority
over diagnostics/error messages of outputs. This principle of error prioritisation also
finds use in the CTEL master module in the I/O mixed operation.