FB_DBCyclicRdWrt

FB_DBCyclicRdWrt 1:

The FB_DBCyclicRdWrt function block can be used to start or stop the cyclic logging \ writing of variables.

VAR_INPUT

VAR_INPUT
    sNetID      : T_AmsNetId;
    bExecute    : BOOL;
    tTimeout    : TIME;
END_VAR

sNetID : Is a string containing the AMS network identifier of the target device to which the ADS command is directed.

bExecute : A rising edge starts the read/write cycle, while a falling edge stops it.

tTimeout : States the length of the timeout that may not be exceeded by execution of the ADS command.

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 : Supplies the ADS Error Code or the TcDatabaseSrv_Error_Codes when the bError output is set.

sSQLState : Supplies the SQL error code of the specified database type.

Development environment	Target system type	PLC libraries to be linked
TwinCAT v2.10.0	PC or CX (x86)	TcDatabase.Lib
TwinCAT v2.10.0	CX (ARM)	TcDatabase.Lib