IOF_GetDeviceName
The function block IOF_GetDeviceName allows the device identifier of an I/O device to be read. Internally to this function block an instance of the ADSREAD function block is called. The device identifier can be specified by the user during the configuration in the TwinCAT System Manager. When the system starts up it is then sent as a string to the I/O drivers, and can be read by the ADS commands. The I/O device whose device identifier is to be read is specified by the input variable DEVICEID.
VAR_INPUT
VAR_INPUT
NETID : T_AmsNetId;
DEVICEID : UDINT;
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.
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;
DEVICENAME : T_MaxString;
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.
DEVICENAME: The device identifier of the I/O device.
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 ) |