python使用modbus_tk库与plc通信

#与汇川AM401plc进行通信

可使用


import modbus_tk
import modbus_tk.defines as cst
import modbus_tk.modbus_tcp as modbus_tcp

logger = modbus_tk.utils.create_logger("console")
import struct
AI = {}


if __name__ == "__main__":

    def int2float(a, b):
        f = 0
        try:
            z0 = hex(a)[2:].zfill(4)  # 取0x后边的部分
            z1 = hex(b)[2:].zfill(4)  # 取0x后边的部分
            z = z1 + z0  # 高字节在前 低字节在后
            f = struct.unpack('!f', bytes.fromhex(z))[0]  # 返回浮点数
            # z=z0+z1 #低字节在前 高字节在后
            # print (z)
        except BaseException as e:
            print(e)
        return f



    def float2int(a):
        return struct.unpack(', struct.pack(', a))  # 两次操作都为小端形式


    try:
        # 连接MODBUS TCP从机
        master = modbus_tcp.TcpMaster(host="192.168.7.254")
        master.set_timeout(5.0)
        logger.info("connected")

        a_0 = master.execute(1, cst.READ_HOLDING_REGISTERS, 600, 2)#读浮点数据
        AI[0] = float('%.2f' % int2float(a_0[0], a_0[1]))
        print(AI[0])

        a = float2int(11.25)
        logger.info(master.execute(1, cst.WRITE_MULTIPLE_REGISTERS, 600, output_value=[a[0],a[1]]))#写浮点数据



        # 读输入寄存器
        # logger.info(master.execute(1, cst.WRITE_MULTIPLE_COILS, 0, output_value=[1,1,1,1]))
        logger.info(master.execute(1, cst.WRITE_SINGLE_REGISTER, 4, output_value=0))  #写入mx8.0 ,除以2
        logger.info(master.execute(1, cst.READ_INPUT_REGISTERS, 4, 1))  # #读取mx8.0 ,除以2

        logger.info(master.execute(1, cst.WRITE_SINGLE_REGISTER, 100, output_value=-1))  # mw100 写入20
        logger.info(master.execute(1, cst.READ_INPUT_REGISTERS, 100, 1))  # mw100  读取

        # logger.info(master.execute(1, cst.WRITE_MULTIPLE_REGISTERS, 100, output_value=[3,0,0,0])) #mw100 写入2 批量写入

    except modbus_tk.modbus.ModbusError as e:
        logger.error("%s- Code=%d" % (e, e.get_exception_code()))



负数读写有问题


import modbus_tk
import modbus_tk.defines as cst
import modbus_tk.modbus_tcp as modbus_tcp

logger = modbus_tk.utils.create_logger("console")
import struct
AI = {}


if __name__ == "__main__":

    def int2float(a1):
        return struct.unpack(', struct.pack(', a1[0], a1[1]),a1[2])



    def float2int(a):
        return struct.unpack(', struct.pack(', a))  # 两次操作都为小端形式


    try:
        # 连接MODBUS TCP从机
        master = modbus_tcp.TcpMaster(host="192.168.7.254")
        master.set_timeout(5.0)
        logger.info("connected")

        a_0 = master.execute(1, cst.READ_HOLDING_REGISTERS, 600, 2)
        b=struct.unpack(', struct.pack(', a_0[0], a_0[1]))
        print(b)


        a = float2int(-256.456)
        logger.info(master.execute(1, cst.WRITE_MULTIPLE_REGISTERS, 600, output_value=[a[0],a[1]]))





        # 读输入寄存器
        # logger.info(master.execute(1, cst.WRITE_MULTIPLE_COILS, 0, output_value=[1,1,1,1]))
        logger.info(master.execute(1, cst.WRITE_SINGLE_REGISTER, 4, output_value=0))  #写入mx8.0 ,除以2
        logger.info(master.execute(1, cst.READ_INPUT_REGISTERS, 4, 1))  # #读取mx8.0 ,除以2

        logger.info(master.execute(1, cst.WRITE_SINGLE_REGISTER, 100, output_value=-1))  # mw100 写入20
        logger.info(master.execute(1, cst.READ_INPUT_REGISTERS, 100, 1))  # mw100  读取

        # logger.info(master.execute(1, cst.WRITE_MULTIPLE_REGISTERS, 100, output_value=[3,0,0,0])) #mw100 写入2 批量写入

    except modbus_tk.modbus.ModbusError as e:
        logger.error("%s- Code=%d" % (e, e.get_exception_code()))



https://blog.csdn.net/lzl640/article/details/118722675?ops_request_misc=&request_id=&biz_id=102&utm_term=python%E5%86%99%E5%85%A5modbustcp%E6%B5%AE%E7%82%B9&utm_medium=distribute.pc_search_result.none-task-blog-2allsobaiduweb~default-2-118722675.142v62pc_search_tree,201v3control,213v1control&spm=1018.2226.3001.4187

https://blog.csdn.net/weixin_42631695/article/details/126870220?ops_request_misc=&request_id=&biz_id=102&utm_term=python%E5%86%99%E5%85%A5modbustcp%E6%B5%AE%E7%82%B9&utm_medium=distribute.pc_search_result.none-task-blog-2allsobaiduweb~default-8-126870220.142v62pc_search_tree,201v3control,213v1control&spm=1018.2226.3001.4187

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