Added Kaco inverter implementation

- Added Kaco inverter implementation
- Small refactoring
- Added release inverter power signal for simultaneous start of the
  inverters

PLC/POUs/FB_String.TcPOU

@@ -1,11 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
-<TcPlcObject Version="1.1.0.1" ProductVersion="3.1.4026.8">
+<TcPlcObject Version="1.1.0.1" ProductVersion="3.1.4026.12">
   <POU Name="FB_String" Id="{46501225-f446-4674-bfed-3be64273e576}" SpecialFunc="None">
     <Declaration><![CDATA[FUNCTION_BLOCK FB_String
 VAR_INPUT
 	// Enable
 	xEnable : BOOL;
 	
+	// Release inverter power
+	xReleaseInverterPower : BOOL;
+	
 	// String number for unit numbering starting with 0 for String 1
 	uiStringNumber : UINT;
 	
@@ -176,8 +179,8 @@ VAR
 	_sName : STRING;
 	
 	// String inverter
-	_fbInverter : FB_PowerSupplySunspec(Name);
-	//_fbInverter : FB_PowerSupplyKaco(Name);
+	//_fbInverter : FB_PowerSupplySunspec(Name);
+	_fbInverter : FB_PowerSupplyKaco(Name);
 	
 	// Internal inverter power command
 	_rPowerInverterInternal : REAL;
@@ -378,6 +381,7 @@ xOff := _fbModule1.xOff AND _fbModule2.xOff AND _fbModule3.xOff;
 _fbInverter(
 	sInverterIPAddr:= sInverterIP, 
 	xEnable:= _xEnableInverter AND xEmergencyStopOk,
+	xReleasePower := xReleaseInverterPower,
 	rPower:= _rPowerInverterInternal, 
 	xReset:= xConfirmAlarms, 
 	rMaxBattPower:= DINT_TO_REAL(GVL_CONFIG.diMaxStringDischargePower),