EBus Error Behaviour
The parameter EBus error behavior is new in firmware version 8.
This parameter is used to set the response to an E-bus error. The following options are available:
Legacy | Output data is still written, input data is frozen and therefore no longer current. |
Set IOs to 0 | Output data is written to zero; input data is written to zero; when the E-bus is error-free, it automatically starts the data exchange. |
Set IOs to 0 without EBus restart | Output data is written to zero; input data is written to zero; when the E-bus is error-free, it can be activated again via the record data (see below). |
Activating the E-bus after an E-bus error
In the DAP, information about the E-bus is provided via the status DWord. When an error occurs in the E-bus, the bit EcFrameError is set (in the high word bit offset x.2). Once the error has been rectified and the coupler is ready to restart the E-bus, the bit EcFrameError is reset and the flag NeedEBusRese is set in the high word bit offset x.4.
The reset is issued via record data and is structured as follows.
PROFINET record data (write request) | Value | Meaning |
|---|---|---|
Slot | 0 | Slot number |
SubSlot | 1 | Sub slot number |
Index | 0x2013 | Index Reset |
Lenght | 2 | Data length |
Data | 0x1234 | Value |
Once the reset has been issued, the bit NeedEBusReset is reset.