Read 8 Discrete Inputs from Modbus-TCP Server – Server available at Port 502 (IP-Address 190.172.268.100) – Starting Address “1”, Number of Inputs to Read: “8” (Notice that the Starting address might be shifted by “1”. In this example we are reading 8 Inputs, the first is Register “1” (Addressed with “0”)
from easymodbus.modbusClient import ModbusClient
modbusclient = ModbusClient(‘190.172.168.100’, 502)
modbusclient.connect()
discreteInputs = modbusclient.read_discreteinputs(0, 8)
print(discreteInputs)
modbusclient.close()
Read 8 Inputs Registers from Modbus-TCP Server – Server available at Port 502 (IP-Address 190.172.268.100) – Starting Address “1”, Number of Registers to Read: “8” (Notice that the Starting address might be shifted by “1”. In this example we are reading 8 Registers, the first is Register “1” (Addressed with “0”)
from easymodbus.modbusClient import ModbusClient
modbusclient = ModbusClient(‘190.172.168.100’, 502)
modbusclient.connect()
inputRegisters = modbusclient.read_inputregisters(0, 8)
print(inputRegisters)
modbusclient.close()
Write a single coil to the Server – Coil number “1”
import easymodbus.modbusClient
modbusclient = easymodbus.modbusClient.ModbusClient(‘190.172.168.100’, 502)
modbusclient.connect()
modbusclient.write_single_coil(0,True)
modbusclient.close()
Write a float value to a Modbus TCP Server (Two Registers are required, since one Modbus Register has 16 Bit)
import easymodbus.modbusClient
modbusclient = easymodbus.modbusClient.ModbusClient(‘190.172.168.100’, 502)
modbusclient.connect()
modbusclient.write_multiple_registers(0, easymodbus.modbusClient.convert_float_to_two_registers(3.141517))
modbusclient.close()
Read a Float Value from Modbus TCP Server (Two Registers are required, since one Modbus Register has 16 Bit
import easymodbus.modbusClient
modbusclient = easymodbus.modbusClient.ModbusClient(‘190.172.168.100, 502)
modbusclient.connect()
holdingRegisters = easymodbus.modbusClient.convert_registers_to_float(modbusclient.read_holdingregisters(0,2))
print (holdingRegisters)
modbusclient.close()