[英]Using pymodbus to read registers
I'm trying to read modbus registers from a PLC using pymodbus. 我正在尝试使用pymodbus从PLC读取modbus寄存器。 I am following the example posted here .
我遵循此处发布的示例。 When I attempt
print.registers
I get the following error: object has no attribute 'registers'
The example doesn't show the modules being imported but seems to be the accepted answer. 当我尝试
print.registers
,出现以下错误: object has no attribute 'registers'
该示例未显示正在导入的模块,但似乎是可接受的答案。 I think the error may be that I'm importing the wrong module or that I am missing a module. 我认为错误可能是我导入了错误的模块或缺少模块。 I am simply trying to read a register.
我只是想阅读一个寄存器。
Here is my code: 这是我的代码:
from pymodbus.client.sync import ModbusTcpClient
c = ModbusTcpClient(host="192.168.1.20")
chk = c.read_holding_registers(257,10, unit = 1)
response = c.execute(chk)
print response.registers
From reading the pymodbus code , it appears that the read_holding_registers
object's execute
method will return either a response object or an ExceptionResponse
object that contains an error. 从读取的pymodbus代码 ,看来该
read_holding_registers
对象的execute
方法将返回一个响应对象或 ExceptionResponse
包含错误的对象。 I would guess you're receiving the latter. 我想你会收到后者的。 You need to try something like this:
您需要尝试这样的事情:
from pymodbus.register_read_message import ReadHoldingRegistersResponse
#...
response = c.execute(chk)
if isinstance(response, ReadHoldingRegistersResponse):
print response.registers
else:
pass # handle error condition here
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