Diagnostics Via Status Bits - Festo CPX-FB39 Description

4 Diagnostics and error handling
4.3

Diagnostics via status bits

Status bits are internal inputs that serve to display common diagnostic messages (global error mes­
sages).
Please Note
The diagnostic mode "Status bits" must be activated via DIL switch 2.2 on the bus node
(è 2.4.5 Setting of the diagnostic mode (remote I/O)).
Status bits are treated as inputs and there can be queried, linked and processed as "standard" inputs.
In the case of activated "Status bits" diagnostics mode, the first 16 inputs are assigned
although only 8 inputs are used (è 3.5.1 Basic rules for addressing).
Status bits are treated as "normal" inputs.
– If all status bits supply a 0-signal, no error is reported.
– If at least one status bit delivers a 1-signal, there is a fault. The diagnostic information when there is
a 1-signal is shown in the following table.
Bit Diagnostic information with a 1-signal
0 Fault at valve or pneumatic module
1 Error on output module
2 Error on input module
3 Error on analogue module or technology module
4 Undervoltage
5 Short circuit/overload
6 Wire break
7 Other error
Tab. 4.2
Please Note
If various errors occur simultaneously on different types of modules, these errors can­
not be assigned via the status bits.
Errors can be uniquely defined via the I/O diagnostics interface, if needed.
Further notes on the function and content of the status bits are found in the CPX system
description (è P.BE-CPX-SYS-...).
Festo – P.BE-CPX-FB39-EN – 1504NH – English
Description
Module type in which an error has occurred
Error type
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