ModbusTCP从站（服务端）扫描工具 python实现

扫描指定IP网络下，有哪些modbusTCP服务端[1-247]

参考连接：https://pymodbus.readthedocs.io/en/dev/source/examples.html

from pymodbus.client import ModbusTcpClient
from pymodbus.exceptions import ModbusIOException, ConnectionException, NoSuchSlaveException
import time


def read_holding_registers(client, slave_address):
    """尝试读取指定从站的保持寄存器40001的数据"""
    try:
        # 使用client.read_holding_registers函数读取保持寄存器
        result = client.read_holding_registers(0, 1, slave_address)
        # 检查result是否为ModbusIOException，如果是，则直接处理异常，不尝试访问registers属性
        if isinstance(result, ModbusIOException):
            raise result  # 重新抛出异常以便在外部统一处理

        print(f"Slave {slave_address}: {result.registers[0]}")
    except ConnectionException as e:
        # 如果连接问题或无此从站，则捕获异常并打印信息
        print(f"Error connecting to or reading from Slave {slave_address}: {e}")
    except ModbusIOException as e:
        # 其他Modbus通信错误
        print(f"Error communicating with Slave {slave_address}: {e}")
    except NoSuchSlaveException as e:
        # NoSuchSlaveException
        print(f"NoSuchSlaveException with Slave {slave_address}: {e}")


if __name__ == "__main__":
    # 初始化TCP客户端，这里以默认端口502为例
    client = ModbusTcpClient('localhost', port=502)  # 请将'localhost'替换为实际的Modbus TCP服务器IP地址

    # 连接到Modbus TCP设备
    if client.connect():
        print("Connected to Modbus TCP device.")

        # 循环遍历从站地址1至247
        for slave_address in range(1, 248):
            read_holding_registers(client, slave_address)
            time.sleep(0.200)  # 延迟200毫秒

        # 关闭连接
        client.close()
    else:
        print("Failed to connect to the Modbus TCP device.")