FB_ReadCouplerDiag
The function block FB_ReadCouplerDiag allows reading of the first and second flashing sequences of the error LED on the coupler when a terminal bus or coupler error occurs. The data is transferred to the PLC via the 2-byte PLC interface. This only works if communication is maintained via the fieldbus. It must be possible to transfer data from the coupler to the PLC via the fieldbus without errors. To detect a coupler error that has occurred, the status byte of the coupler can be queried cyclically in the PLC and the function block is activated if an error occurs.
Inputs
VAR_INPUT
stState : PLCINTFSTRUCT;
bExecute : BOOL;
tTimeout : TIME;
END_VARName | Type | Description |
|---|---|---|
stState | Status word of the 2-byte PLC interface. | |
bExecute | BOOL | The function block is enabled by a positive edge at this input. |
tTimeout | TIME | Specifies the time-out period that must not be exceeded when the function is executed. |
Outputs
VAR_OUTPUT
stCtrl : PLCINTFSTRUCT;
bBusy : BOOL;
bError : BOOL;
nErrId : UDINT;
stDiag : ST_CouplerDiag;
END_VARName | Type | Description |
|---|---|---|
stCtrl | Control word of the 2-byte PLC interface. | |
bBusy | BOOL | When the function block is activated, this output is set and remains set until the function is completed. |
bError | BOOL | If an error occurs during the execution of the function, this output is set after the bBusy output has been reset. |
nErrId | UDINT | Supplies the error number when the bError output is set. |
Error number | Error description |
|---|---|
0 | No error |
0x100 | Error at initialisation of the communication via the 2 byte PLC interface |
0x200 | Error during communication |
0x300 | Timeout-Error. The permitted execution time was exceeded |
0x400 | Wrong parameter value at register number |
0x500 | Wrong parameter value at table number |
Name | Type | Description |
|---|---|---|
stDiag | Structure containing the coupler's diagnostic information (error type, and the first and second coupler flashing sequences). |
Requirements
|
Development environment |
Target system type |
PLC libraries to include (category group) |
|---|---|---|
|
TwinCAT v3.1.0 |
PC or CX (x86, x64, ARM) |
Tc2_Coupler (IO) |