69 lines
2.4 KiB
Python
69 lines
2.4 KiB
Python
import time
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import pandas as pd
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from pymodbus.client import ModbusTcpClient
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class PvInverter:
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def __init__(self, device_name: str, ip_address: str, port: int = 502, unit: int = 1):
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self.device_name = device_name
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self.ip = ip_address
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self.port = port
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self.unit = unit
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self.client = None
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self.registers = None
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self.connect_to_modbus()
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self.get_registers()
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def connect_to_modbus(self):
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# Timeout & retries optional, aber hilfreich:
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self.client = ModbusTcpClient(self.ip, port=self.port, timeout=3.0, retries=3)
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if not self.client.connect():
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print("Verbindung zu Wechselrichter fehlgeschlagen.")
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raise SystemExit(1)
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print("Verbindung zu Wechselrichter erfolgreich.")
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# WICHTIG: NICHT hier schließen!
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# finally: self.client.close() <-- entfernen
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def close(self):
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if self.client:
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self.client.close()
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self.client = None
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def get_registers(self):
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excel_path = "modbus_registers/pv_inverter_registers.xlsx"
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xls = pd.ExcelFile(excel_path)
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df_input_registers = xls.parse()
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df_clean = df_input_registers[['MB Adresse', 'Beschreibung', 'Variabel Typ']].dropna()
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df_clean['MB Adresse'] = df_clean['MB Adresse'].astype(int)
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self.registers = {
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row['MB Adresse']: {
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'desc': row['Beschreibung'],
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'type': 'REAL' if str(row['Variabel Typ']).upper() == 'REAL' else 'INT'
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}
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for _, row in df_clean.iterrows()
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}
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def get_state(self):
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data = {'Zeit': time.strftime('%Y-%m-%d %H:%M:%S')}
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for address, info in self.registers.items():
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reg_type = info['type']
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# Unit-ID mitgeben (wichtig bei pymodbus>=3)
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result = self.client.read_holding_registers(
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address=address,
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count=2 if reg_type == 'REAL' else 1,
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slave=self.unit # pymodbus 2.x -> 'slave', nicht 'unit'
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)
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if result.isError():
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print(f"Fehler beim Lesen von Adresse {address}: {result}")
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continue
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# Minimal invasiv: wie bei dir – erstes Register verwenden
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value = result.registers[0]
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print(f"Adresse {address} - {info['desc']}: {value}")
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data[f"{address} - {info['desc']}"] = value
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return data
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