Python freeopcua：如何将 StatusCode 设置为“Bad”

Question

我正在尝试管理我的 opcua 服务器中标签的质量状态，但我找不到正确设置 StatusCode 的方法。在这里找到我的代码片段。感谢名为 Integration Objects 的标准免费客户端，我正在读取服务器标签。

import sys

sys.path.insert(0, "..")

import time

from opcua import ua, Server

server = Server()

server.set_endpoint("opc.tcp://0.0.0.0:4841/freeopcua/server/")

uri = "http://examples.freeopcua.github.io"

idx = server.register_namespace(uri)

objects = server.get_objects_node()

myobj = objects.add_object(idx, "MyObject")

myvar = myobj.add_variable(idx, "MyVariable", 6.7)

myvar.set_writable()    # Set MyVariable to be writable by clients



server.start()



try:

    count = 0

    while True:

        time.sleep(1)

        count += 0.1

        myvar.set_data_value(count)

        # here I'd like to set programmatically the StatusCode of myvar variable

        print(myvar.get_value())

        print("\n")

except Exception as e:

    print('\nOPC failed:', str(e))

    input("...fine errore...")

finally:

    server.stop()

Answer 1

在这里， 我扩展了您的解决方案示例代码：

# import sys
# sys.path.insert(0, "..")

import time

from asyncua.sync import Server, SyncNode, ua

server = Server()
server.set_endpoint("opc.tcp://localhost:4841/freeopcua/server/")
uri = "http://examples.freeopcua.github.io"
idx = server.register_namespace(uri)
objects:SyncNode = server.nodes.objects
myobj:SyncNode = objects.add_object(idx, "MyObject")
myvar:SyncNode = myobj.add_variable(idx, "MyVariable", 6.7)
myvar.set_writable()    # Set MyVariable to be writable by clients
server.start()

try:
    count = 0
    while True:
        time.sleep(1)
        count += 0.1

        # here I'd like to set programmatically the StatusCode of myvar variable
        res = ua.DataValue(Value=count, StatusCode_= ua.StatusCode(ua.StatusCodes.GoodFaultStateActive))
        if count > 1:
            res = ua.DataValue(Value=count, StatusCode_= ua.StatusCode(ua.StatusCodes.Uncertain))
        myvar.write_value(res)

        data:ua.DataValue = myvar.read_data_value()
        print(data.Value.Value, data.StatusCode.value)
except Exception as e:
    print('\nOPC failed:', str(e))
    input("...fine errore...")
finally:
    server.stop(

)