IOF_GetBoxAddrByName

IOF_GetBoxAddrByName 1:

The function block IOF_GetBoxAddrByName permits determination of the fieldbus address of a box (box = slave, module, station) from the box identifier and the device ID. If no fieldbus address is available, the function block returns a physical or a logical address. (In the case of the Beckhoff Lightbus, for instance, it is the physical box number in the optical fibre ring, while in Profibus it is the station address). The box identifier is passed as a string to the function block, and can be specified by the user during the configuration in the TwinCAT System Manager. Internally to the function block an instance of the ADSRDWRT function block is called.

VAR_INPUT

VAR_INPUT
    NETID       : T_AmsNetId;
    DEVICEID    : UDINT;
    BOXNAME     : T_MaxString;
    START       : BOOL;
    TMOUT       : TIME;
END_VAR

NETID: It is possible here to provide the AmsNetId of the TwinCAT computer on which the function to be executed. If it is to be run on the local computer, an empty string can be entered.

DEVICEID: DeviceId specifies the device on which the function is to be executed. The device Ids are specified by the TwinCAT System Manager during the hardware configuration.

BOXNAME: The box identifier as a string.

START: The function block is activated by a positive edge at this input.

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

VAR_OUTPUT

VAR_OUTPUT
    BUSY        : BOOL;
    ERR         : BOOL;
    ERRID       : UDINT;
    BOXADDR     : UINT;
END_VAR

BUSY: When the function block is activated this output is set. It remains set until and acknowledgement is received.

ERR: If an ADS error should occur during the transfer of the command, then this output is set once the BUSY output is reset.

ERRID: Supplies the ADS error number when the ERR output is set.

BOXADDR: The fieldbus address of the box.

Requirements

Development environment

Target system type

IO hardware

PLC libraries to include

TwinCAT v2.7.0

PC (i386)

All IO devices

Standard.Lib; PLCSystem.Lib; TcPLCAds.Lib; TcPlcIoFunctions.Lib

TwinCAT v2.8.0

PC (i386)

All IO devices

TcIoFunctions.Lib

( Standard.Lib; TcBase.Lib; TcSystem.Lib; TcUtilities.Lib are included automatically )