FB_DBConnectionOpen
You can open connections to databases with this function block FB_DBConnectionOpen. This can improve the read and write access speed with the fuction blocks FB_DBWrite, FB_DBRead, FB_DBRecordInsert and FB_FBRecordSelect.
VAR_INPUT
VAR_INPUT
sNetID : T_AmsNetId;
hDBID : DINT;
bExecute: BOOL;
tTimeout: TIME;
END_VAR sNetID: String containing the AMS network ID of the target device, at which the ADS command is directed.
hDBID: Indicates the ID of the database to be used.
bExecute: The command is executed with a rising edge.
tTimeout: Indicates the time before the function is cancelled.
VAR_OUTPUT
VAR_OUTPUT
bBusy : BOOL;
bError : BOOL;
nErrID : UDINT;
sSQLState: ST_DBSQLError;
END_VAR bBusy: The command is in the process of being transmitted by ADS. No new command will be accepted as long as bBusy remains TRUE.
bError: Becomes TRUE, as soon as an error occurs.
nErrID: Returns the ADS error code or TcDatabaseSrv_Error_Codes if the bError output is set.
sSQLState : Returns the SQL error code of the corresponding database type
Requirements
|
Development environment |
Target system type |
PLC libraries to be linked |
|---|---|---|
|
TwinCAT v3.0.0 |
PC or CX (x86) |
Tc2_Database |