first test code
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froniustest.py
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269
froniustest.py
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# Copyright notes: this script was initially made public by user MobusTest in photovoltaikforum.com
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# https://www.photovoltaikforum.com/thread/117173-datamanager-und-modbus-register-mit-modbus-tcp/?postID=2021510#post2021510
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# This client re-uses all the modbus protocoll implementation and data conversion from the original work.
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# The client provides an easy way to explore modbus registers on a Fronius inverter
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# This software is provided "as is" without any guarantee
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# Subsequently this was modified to implement a target charging mode
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#
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# The idea is that at some specified time before a peak pricing period
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# this script is run to see if the system can make it through the peak
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# period on battery alone.
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#
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# This involes
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# * obtaining the curent SOC
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# * obtaining the last hour's discharge rate
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# * calculating if we'll stay above a set SOC%
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# * set the battery system to charge if we won't
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# general imports
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import datetime
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# >>> To install 'pymodbus' you have to execute the following linux command: pip3 install pymodbus
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# imports for Modbus
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from pymodbus.constants import Endian
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from pymodbus.payload import BinaryPayloadDecoder
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from pymodbus.client.tcp import ModbusTcpClient as ModbusClient
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from pymodbus.diag_message import *
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from pymodbus.file_message import *
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from pymodbus.other_message import *
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from pymodbus.mei_message import *
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#from pymodbus.compat import iteritems
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# imports for using enumerations
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from enum import Enum
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# enumeration by using a class. value of the enum ( 1-8 ) is irrelevant!
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# use the method getRegisterLength() instead
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class DataType(Enum):
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String8 = 1
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String16 = 2
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String32 = 3
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Int16 = 4
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UInt16 = 5
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Int32 = 6
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UInt32 = 7
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Float32 = 8
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UInt64 = 7
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# Returns the length (amount) of the registers.
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# This corresponds to the value from the Fronius Excel list (column "Size").
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# This refers to how many registers the Mobus function read_holding_registers() must read to get the complete value
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def getRegisterLength(self):
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if (self == DataType.String8) or (self == DataType.UInt64):
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return int(4)
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elif (self == DataType.String16):
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return int(8)
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elif (self == DataType.String32):
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return int(16)
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elif (self == DataType.Int16) or (self == DataType.UInt16):
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return int(1)
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elif (self == DataType.Int32) or (self == DataType.UInt32) or (self == DataType.Float32):
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return int(2)
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# -------------------------------------------------------------------------------------------------------[ private ]---
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# | The Main Entry Point |
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# ---------------------------------------------------------------------------------------------------------------------
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def main():
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#print ("Current Time: " + datetime.datetime.now().strftime('%H:%M:%S'))
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# Open a new Modbus connection to the fronius inverter (e.g. Symo 10.3)
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modbusClient = ModbusClient("172.19.107.211", port=502, timeout=10)
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modbusClient.connect()
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# The modbus addresses of the registers are documented in the following lists:
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# - Inverter_Register_Map_Float_v1.0_with_SYMOHYBRID_MODEL_124.xlsx
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# - Meter_Register_Map_Float_v1.0.xlsx
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# Goto: https://www.fronius.com/en/photovoltaics/downloads and search for "Modbus Sunspec Maps, State Codes und Events"
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# Downloads the hole ZIP package and enjoy the documentation ;-)
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#
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# Gen 24 specific:
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# Gen24_Primo_Symo_Inverter_Register_Map_Float_storage.xlsx
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# go to https://www.fronius.com/en/solar-energy/installers-partners/downloads
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# search for "GEN24 modbus" to find GEN24 related modbus documentation (register addresses are provided in the .zip file)
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#
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# Note: In this script you have to specify a data type when calling the method getRegisterValue(). This corresponds
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# to the value from the Fronius Excel list (column "Type").
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#
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# The optional parameter "unitNo" of method getRegisterValue() is used to specify from which device the
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# data is to be read. The default value is 1 which corresponds to the inverter.
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# If you want to read data from the SmartMeter, 240 must be used instead.
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# to use this script, adapt and enhance the following list with tuples, containing the follwing information
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# [REGISTERADDRESS, DATATYPE, MODBUSUNITNUMBER]
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# the MODBUSUNITNUMBER is commonly 1 for the inverter and a user defined value for the primary smart meter (common values are 200 or 240)
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print ("Register Overview:")
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reg_map = (
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[40092, DataType.Float32, 1], # Inverter AC Output in W
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[40285, DataType.UInt16, 1], # PV String 1 Output in W (scaled)
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[40305, DataType.UInt16, 1], # PV String 2 Output in W (scaled)
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[40267, DataType.Int16, 1], # DC Scaling Factor
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[40361, DataType.UInt16, 1], # Battery SoC in % (scaled, SF -2)
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[40325, DataType.UInt16, 1], # Energy To Battery in W (scaled, charging)
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[40327, DataType.UInt16, 1], # CHG Percent? as per mqtt-fronius
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[40345, DataType.UInt16, 1], # Energy From Battery in W (scaled, discharging)
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[40098, DataType.Float32, 200], # Energy to/from grid (smart meter, positive values: consumption)
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)
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# for reg in reg_map:
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# tmp_reg = getRegisterValue(modbusClient, reg[0], reg[1], reg[2])
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# print ("Register " + str(reg[0]) + ": " + str(tmp_reg))
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target_map = {
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"soc": [40362, DataType.UInt16, 1, "SoC %"],
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"socSF": [40376, DataType.Int16, 1, "Battery SOC Scaling Factor"],
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"to_bat": [40325, DataType.UInt16, 1, "cW to Battery"],
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"from_bat": [40345, DataType.UInt16, 1, "cW from Battery"],
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"DCSF": [40267, DataType.Int16, 1, "DC scaling factor"],
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"PWSF": [40268, DataType.Int16, 1, "Power Scaling Factor"]
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}
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soc = getRegisterValue(modbusClient,
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target_map["soc"][0],
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target_map["soc"][1],
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target_map["soc"][2])
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socSF = getRegisterValue(modbusClient,
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target_map["socSF"][0],
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target_map["socSF"][1],
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target_map["socSF"][2])
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print(" SoC: " + str(soc))
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print("SoCSF: " + str(socSF))
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print(" SoC: %.2f %%" % (float(soc * 10 ** socSF)))
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PWSF = getRegisterValue(modbusClient,
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target_map["PWSF"][0],
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target_map["PWSF"][1],
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target_map["PWSF"][2])
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print(" PWSF: " + str(PWSF))
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to_bat = getRegisterValue(modbusClient,
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target_map["to_bat"][0],
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target_map["to_bat"][1],
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target_map["to_bat"][2])
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print("To Bat: " + str(to_bat))
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print("To Bat: %.2f" % (to_bat * 10 ** (int(PWSF))))
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from_bat = getRegisterValue(modbusClient,
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target_map["from_bat"][0],
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target_map["from_bat"][1],
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target_map["from_bat"][2])
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print("Fr Bat: " + str(from_bat * 10 ** (int(PWSF))))
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num_avgs = 5
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count = 1
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while count < num_avgs:
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print("To AVG: " + str(get_avg_scaled(modbusClient, target_map["to_bat"], target_map["PWSF"])))
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print("Fr AVG: " + str(get_avg_scaled(modbusClient, target_map["from_bat"], target_map["PWSF"])))
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count += 1
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modbusClient.close()
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# ---
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# ---[ private ]---
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def get_avg_scaled(modbusClient, reg, sfreg, points=50):
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local_data = []
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count = 0
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while ( count < points):
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local_data.append(
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getRegisterValue(
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modbusClient, reg[0], reg[1], reg[2]) * 10 ** getRegisterValue(
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modbusClient, sfreg[0], sfreg[1], sfreg[2]))
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count += 1
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return sum(local_data) / len(local_data)
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# -------------------------------------------------------------------------------------------------------[ private ]---
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# | Gets a value from the inverter |
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# | ----------------------------------------------------------------------------------------------------------------- |
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# | Input parameters: |
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# | -> device ModbusClient An open connection to the modbus device (inverter or smartmeter) |
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# | -> address INT The starting address to read from |
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# | -> dataType DataType The DataType of registers to read |
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# | -> humidity INT The slave unit this request is targeting |
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# | ----------------------------------------------------------------------------------------------------------------- |
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# | Return value: |
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# | <- result STRING Value of the defined address |
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# ---------------------------------------------------------------------------------------------------------------------
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def getRegisterValue(device, address, dataType, unitNo=1):
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#print (" Adr: " + str(address) + " Name: " + dataType.name)
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# Now we can read the data of the register with a Modbus function
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# In the fronius documentation it is described that you have to subtract 1 from the actual address.
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result = device.read_holding_registers(address-1, dataType.getRegisterLength(), slave=unitNo)
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if (result.isError()) :
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return "n.a."
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#print (" value: " + str(result.registers))
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# The values from Modbus must now be reformatted accordingly
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# How to do this reformatting depends on the DataType
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decoder = BinaryPayloadDecoder.fromRegisters(result.registers, byteorder=Endian.Big, wordorder=Endian.Big)
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if (dataType == DataType.String8) or (dataType == DataType.String16) or (dataType == DataType.String32):
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return str(decoder.decode_string(16).decode('utf-8'))
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elif (dataType == DataType.Int16):
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return decoder.decode_16bit_int()
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elif (dataType == DataType.UInt16):
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return decoder.decode_16bit_uint()
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elif (dataType == DataType.Int32):
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return decoder.decode_32bit_int()
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elif (dataType == DataType.UInt32):
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return decoder.decode_32bit_uint()
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elif (dataType == DataType.Float32):
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return decoder.decode_32bit_float()
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else:
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return str(decoder.decode_bits())
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# -------------------------------------------------------------------------------------------------------[ private ]---
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# | Formats the given nuber (powerValue) into a well-formed and readable text |
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# | ----------------------------------------------------------------------------------------------------------------- |
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# | Input parameters: |
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# | -> powerValue FLOAT The value to format |
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# | ----------------------------------------------------------------------------------------------------------------- |
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# | Return value: |
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# | <- formatedText STRING A well-formed and readable text containing the powerValue |
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# ---------------------------------------------------------------------------------------------------------------------
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def formatPowerText(powerValue):
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formatedText = ""
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# Over 1000 'kilo Watt' will be displayed instead of 'Watt'
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if abs(powerValue) > 1000:
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formatedText = "{0} kW".format(str('{:0.2f}'.format(powerValue / 1000))).replace('.', ',')
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else:
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formatedText = "{0} W".format(str('{:.0f}'.format(powerValue))).replace('.', ',')
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return formatedText
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# | Call the main function to start this script |
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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main()
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