lamaLib: energyMeterToModbusRegs

The function converts a UDInt type variable into 2 Word. Specifically, the function transmits the status of an energy meter to 2 Modbus registers (the Modbus registers are word type).

Function call:

"energyMeterToModbusRegs"(energyMeter:=_udint_in_,
                          register1=>_word_out_,
                          register2=>_word_out_);

Source code:

FUNCTION "energyMeterToModbusRegs" : VOID
{ S7_Optimized_Access := 'TRUE' }
VERSION : 0.1
   VAR_INPUT 
      energyMeter : UDInt;   // Energy meter value to send
   END_VAR
 
   VAR_OUTPUT 
      register1 : WORD;   // 1st modbus register
      register2 : WORD;   // 2nd modbus register
   END_VAR
 
   VAR_TEMP 
      uint_hi : UInt;
      uint_lo : UInt;
      en_dw : UDInt;
   END_VAR
 
 
BEGIN
	// copy enegymeter value
	#en_dw := #energyMeter;
	// first word
	#uint_hi := TRUNC(#en_dw / 16#7FFF);
	// 2nd word
	#uint_lo := #en_dw - (#uint_hi * 16#7FFF);
	// copy to reg1
	#register1 := #uint_hi;
	// copy to reg2
	#register2 := #uint_lo;
END_FUNCTION

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