Sample program 1

Connection of a serial bar code scanner

In this example a bar code reader is connected to the EL6001. Characters will be read by the reader until the ASCII character 0x0D (13_dec, CR) is received.

Data:

Quick task for executing the serial communication: 1 ms cycle time
Standard PLC task: 10 ms cycle time
Barcode scanner on channel 1
TwinCAT 2.11 required
“TwinCAT PLC Serial Communication” supplement is required

A detailed description for the use of the serial communication library is stored in the Beckhoff Information System.

Beckhoff Information System -> TwinCAT -> TwinCAT PLC -> TwinCAT libraries for PC-based systems -> TwinCAT PLC Library : Serial communication

Starting the example program

The application examples have been tested with a test configuration and are described accordingly.

Certain deviations when setting up actual applications are possible.

The following hardware and software were used for the test configuration:

TwinCAT master PC with Windows XP Professional SP 3, TwinCAT version 2.11 (Build 1528) and INTEL PRO/100 VE Ethernet adapter
Beckhoff EK1100 EtherCAT coupler, EL6001 terminals
Serial barcode scanner with 9-pole sub-D connector

Procedure for starting the program

After clicking the Download button, save the zip file locally on your hard disk, and unzip the *.TSM (configuration) and the *.PRO (PLC program) files into a temporary working folder
Run the *.TSM file and the *.PRO file; the TwinCAT System Manager and TwinCAT PLC will open
Connect the hardware in accordance with fig. 1 and connect the Ethernet adapter of your PC to the EtherCAT coupler (further information on this can be found in the corresponding coupler manuals)
Select the local Ethernet adapter (with real-time driver, if one) under System configuration, I/O configuration, I/O devices, Device (EtherCAT); on the “Adapter” tab choose “Search...”, select the appropriate adapter and confirm (see Figures)

Sample program 1 2: — Searching the Ethernet adapter

Sample program 1 3: — Selection and confirmation of the Ethernet adapter

Activation of the configuration and confirmation:

Sample program 1 4: — Activation of the configuration

Sample program 1 5: — Confirming the activation of the configuration

Confirming new variable mapping, restart in RUN mode:

Sample program 1 6: — Generating variable mapping

Sample program 1 7: — Restarting TwinCAT in RUN mode

In TwinCAT PLC, under the “Project” menu, select “Rebuild all” to compile the project:

In TwinCAT PLC: log in with the “F11” button, confirm loading the program, run the program with the “F5” button:

Sample program 1 9: — Confirming program start

After the character 0x13 has been received, the barcode is stored in “LastBarcode”