c读写opc数据库示例

pip install pyopcua

from opcua import Client

# 连接到OPC UA服务器
client = Client("opc.tcp://localhost:4840/freeopcua/server/")

# 连接服务器
client.connect()

# 获取根节点
root = client.get_root_node()

# 获取对象节点
objects = root.get_child(["0:Objects"])

# 获取特定变量节点
myvar = objects.get_child(["0:MyObject", "0:MyVariable"])

# 读取变量值
value = myvar.get_value()
print(f"Value of MyVariable: {value}")

# 断开连接
client.disconnect()

from opcua import Client

# 连接到OPC UA服务器
client = Client("opc.tcp://localhost:4840/freeopcua/server/")

# 连接服务器
client.connect()

# 获取根节点
root = client.get_root_node()

# 获取对象节点
objects = root.get_child(["0:Objects"])

# 获取特定变量节点
myvar = objects.get_child(["0:MyObject", "0:MyVariable"])

# 写入变量值
new_value = 123
myvar.set_value(new_value)
print(f"Set value of MyVariable to: {new_value}")

# 断开连接
client.disconnect()