用ModbusTcpClient库读取三菱PLC上的Python-modbus通信

Question

我试图用以下代码与三菱PLC（Q06udeh）上的文字进行交流和阅读：

from pymodbus.client.sync import ModbusTcpClient

client = ModbusTcpClient('10.1.1.4',port=5007)
client.connect()

result = client.read_holding_registers(1,1)
print result
t = result.registers[0]
print t

我得到以下输出：

^{pr2}$

不管我如何改变不同参数的访问词没希望，我还是没有成功。在

请帮忙。在

Answer 1

使用modbus

首先，您需要安装modbus_-tk软件包：

pip install modbus_tk

然后，尝试运行以下示例代码：

#  General MODBUS includes
import modbus_tk
import modbus_tk.defines as cst
# TCP MODBUS includes
from modbus_tk import modbus_tcp

def main():
    device_id = 1
    master = modbus_tcp.TcpMaster("10.1.1.4")
    master.set_timeout(3)     #it's really optional
    master.set_verbose(True)  # this is optional too
    data = master.execute(device_id, cst.READ_HOLDING_REGISTERS, 100, 1) #Usage: 100 is registry number and 1 means that size of data is 16bit (modbus protocol specification)
    print "data    ", data
    print "data[0] ", data[0]

if __name__ == "__main__":
    main()

您可以在此处找到更多示例： https://github.com/ljean/modbus-tk/tree/master/examples