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: String containing the AMS network ID of the target device, at which the ADS command is directed.

bExecute: The read/write cycle is started with a rising edge and stopped with a falling edge.

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

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