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A PLC application that is to communicate with a substation via the transport interface requires the following resources:

• An instance of the communication function block: FB_IEC870_5_103TProtocol;
• An instance of the TX/RX data buffer: ST_IEC870_5_103TBuffer;
• An instance of the function block for manipulating the TX/RX data buffer: FB_IEC870_5_103TBufferCtrl;