搭建流程

通过SIEMES博途配置OPCUA服务器，并启动PLC仿真完成OPCUA服务器的搭建
通过Python pip安装OPCUA模块，搭建OPCUA客户端进行通讯
教程目标：
1、调试python代码进行客户端搭建

本文以OPCUA模块搭建OPCUA通讯基本搭建，最新的OPCUA模块建议选择opcua-asnicio；
如果你对python异步陌生，那OPCUA通讯仍可适用

1.pip安装opcua模块

通过pip install opcua来为python 环境安装模块
建议通过虚拟环境安装模块

2.编写python代码

代码如下（示例）：

importtimefromopcua importClient,uaimportjson# opcua client classclassOpcuaClient:def__init__(self,url:str,user_name:str=None,user_password:str=None,basic256:bool=False,sha256:bool=False,cert_path:str=None,key_path:str=None,application_uri=None)->None:self._url =url        self._client =Client(url)ifuser_name anduser_password:self._client.set_user(user_name)self._client.set_password(user_password)ifbasic256 andnotsha256:self._client.set_security_string("Basic256,SignAndEncrypt,None,None")ifsha256:self._client.set_security_string(f"Basic256Sha256,SignAndEncrypt,{cert_path},{key_path}")self._client.application_uri ="urn:example.org:FreeOpcUa:python-opcua"ifapplication_uri isNoneelseapplication_uri        # print(f'client application uri: {self._client.application_uri}')self._client.connect()@propertydefroot_node(self):returnself._client.get_root_node()defget_all_childeren(self,node)->dict:_node_dict ={}for_nc innode.get_children():if_nc:print(type(_nc),_nc)if_nc.get_children():_sub_nc =self.get_all_childeren(_nc)_sub_nc['value']=str(_nc)_node_dict[f'{_nc.get_browse_name()}']=_sub_nc                else:_node_dict[f'{_nc.get_browse_name()}']=str(_nc)return_node_dict    defjson_all_childeren(self,file_path:str)->str:_time =time.perf_counter()_node_dict =self.get_all_childeren(self.root_node)withopen(file_path,'w')asf:json.dump(_node_dict,f,indent=4)print(f'generate json file time: {time.perf_counter()-_time}')returnfile_path    defread_node(self,node):returnself._client.get_node(node).get_value()defwrite_node(self,node,value):self._client.get_node(node).set_value(value)defread_nodes(self,nodes):return{node:self.read_node(node)fornode innodes}defwrite_nodes(self,nodes):fornode,value innodes.items():self.write_node(node,value)defclose(self):self._client.disconnect()if__name__ =='__main__':url ='opc.tcp://192.168.10.1:4840'user_name ='user1'user_password ='Azxs1254'cert_path ="./opc_comm/my_cert.pem"key_path ="./opc_comm/my_private_key.pem"my_client =OpcuaClient(url,user_name,user_password,True,True,cert_path,key_path)print(my_client.root_node.get_browse_name())# print(client.get_all_childeren(client.root_node))# get all children nodes and save to json filemy_client.json_all_childeren('./opc_comm/OPC_Nodes.json')# read node valueprint(my_client.read_node('ns=3;s="my_data"."my_bool1"'))my_bool =Falsetry:whileTrue:_time =time.perf_counter()my_bool =notmy_bool            my_client.write_node('ns=3;s=\"my_data\".\"my_bool1\"',ua.DataValue(ua.Variant(my_bool,ua.VariantType.Boolean)))print(f'write value: {str(my_bool):<8},write time: {time.perf_counter()-_time:10.8f}')time.sleep(1)exceptKeyboardInterrupt:raisefinally:my_client.close()

该处使用的url网络请求的数据。服务器url、

3.生成客户端通讯证书及私钥

1、子网掩码及plc系列型号，点击start;
实例启动完成后，需要在博途中点击在线，搜索plc,并将项目下载到plc实例中，启动plc完成OPCUA服务器搭建工作

8、配置python opcua客户端

配置用户名、仿真环境搭建完成验证

if__name__ =='__main__':url ='opc.tcp://192.168.10.1:4840'user_name ='user1'user_password ='Azxs1254'cert_path ="./opc_comm/my_cert.pem"key_path ="./opc_comm/my_private_key.pem"my_client =OpcuaClient(url,user_name,user_password,True,True,cert_path,key_path)