EMS communication and Voltage optimizations

- Added data for EMS communication
- Added highest segment voltage for charging check
- Added lowest segment voltage for discharging check

PLC/GVLs/GVL_CONFIG.TcGVL

@@ -251,6 +251,9 @@ VAR_GLOBAL PERSISTENT
 	// Minimum unit voltage required for inverter startup (Volt)
 	rMinimumUnitVoltage : REAL := 55.0;
 	
+	// Maximum unit voltage for fully charged (Volt)
+	rMaximumUnitVoltage : REAL := 79.0;
+	
 	// Delta value to minimum unit voltage for shutdown discharge (Volt)
 	rDeltaUnitVoltageShutdownDischarge : REAL := 5.0;