FB_GetAlive

To ensure that there is a correct connection between TwinCAT and the RRCS server, the function block FB_GetAlive can be used.

Inputs

VAR_INPUT
    bExecute : BOOL;
END_VAR

Name	Type	Description
bExecute	BOOL	The function block is enabled by a positive edge at this input.

Outputs

VAR_OUTPUT
    eRRCS_ErrorCode : E_RRCS_ErrorCodes
    bBusy           : BOOL;
    bError          : BOOL;
    nStatusCode     : UINT;
    bAlive          : BOOL
END_VAR

Name	Type	Description
eRRCS_ErrorCode	E_RRCS_ErrorCodes	Error code received from RRCS_Servers.
bBusy	BOOL	Is TRUE as long as the function block is busy with the query and no error occurs.
bError	BOOL	Is TRUE if an error occurred during the query.
nStatusCode	UINT	Servers deliver the status code as a response to every HTTP request. The server uses this code to inform the client whether the request was successful. Normally 200 (OK) is returned. Detailed information on this: developer.mozilla.org/en/docs/Web/HTTP/Reference/Status
bAlive	BOOL	Is TRUE if communication to the RRCS server is working.

FB_GetAlive has an extended FB_init method in which an instance of FB_RRCScom must be referenced using a pointer:

VAR
fbGetAlive: FB_GetAlive(pfbRRCscom := ADR(fbRRCScom)); 
END_VAR