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我正在尝试使用带有 python 的 snap7 连接到 plc，以前代码工作正常，但现在当我尝试运行时显示错误 b'CLI：现在无法更改此参数'我尝试在不同版本的 python 上运行它，我也重新安装snap7 库现在我尝试使用 python-snap7 1.1 库和 snap7 版本的 1.4 运行。

import snap7.client as c
from snap7.util import *
from snap7.types import *


class Comms():
    """Controller PLC Comms """

    def __init__(self, ip_addr, rack, slot):
        """Initialize connection attributes."""
        self.plc = c.Client()
        self.ip_addr = ip_addr
        self.rack = rack
        self.slot = slot

    def connect(self):
        """Establish connection to PLC """
        try:
            self.plc.connect(self.ip_addr, self.rack, self.slot)
            message = "Connection Successfull!!!!"
            status = 1

        except:
            message = "Connection Failed - Unreachable peer, check plc setup and connection"
            status = 2
        return status

    def ReadMemory(self, area, index, start, lenght):
        """Read Memory Area """
        try:
            self.data = self.plc.read_area(areas[area], index, start, lenght)
            bytes = []
            for self.data in self.data:
                bytes.append(self.data)
            return bytes

        except:
            message = 'Failed to read Data'
            return message

    def ReadBool(self, byte_index, bool_index):
        '''Read bool from array'''
        try:
            boolVal = get_bool(self.data, byte_index, bool_index)
            print(boolVal)
            return boolVal

        except:
            pass



if __name__ == "__main__":
    plc = Comms('192.168.1.10', 0, 1)
    plc.connect()
    print(plc.connect())
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