Question

我使用node-opcua module和我想通过订阅监控许多opc ua nodes 我看到结果如下：用户在html用户界面中选择要监控的节点，然后点击发送这些nodeIds作为参数的监控按钮，然后为每个nodeid设置订阅和.on（＆＃34;改变＆＃34;）适用于所有这些项目，例如并行。现在代码如下：

 var monitoredItem  = the_subscription.monitor({
       nodeId: opcua.resolveNodeId("ns=6;s=S71500ET200MP station_1.Master.111"),
       attributeId: 13
   },
   {
       samplingInterval: 100,
       discardOldest: true,
       queueSize: 10
   },
   opcua.read_service.TimestampsToReturn.Both
   );
   console.log("-------------------------------------");
   var nodes = [];

   monitoredItem.on("changed",function(dataValue){
      //console.log(" value = ",dataValue.value.value);
      //console.log(" sourceTimestamp = ",dataValue.sourceTimestamp.toISOString());
      //console.log(JSON.stringify(dataValue));
      var Node = {nodeId: "ns=6;s=S71500ET200MP station_1.Master.111", nodeName: "111" , nodeValue: dataValue.value.value , nodeTimestamp: dataValue.sourceTimestamp.toISOString()};
      var arrayNode = Object.keys(Node).map(function(k) { return Node[k] });
      //console.log(JSON.stringify(Node));
      nodes.push(arrayNode);

    //  console.log(nodes);
   });
},

现在，如果我想设置新项目进行监控，只需添加许多变量MonitorItem1，..2，..3等。

如何以agile/dynamic方式进行更多操作？如果我有nodeIds的数组（字符串），我希望在订阅中监控其中的每一个。代码是async.series（[code]）

的一部分

Answer 1

使用async.each方法解决

async.each(nodeIdArr, function(nodeid, callback) {

     var monitoredItem  = the_subscription.monitor({
           nodeId: opcua.resolveNodeId(nodeid),
           attributeId: 13
       },
       {
           samplingInterval: 100,
           discardOldest: true,
           queueSize: 10
       },
       opcua.read_service.TimestampsToReturn.Both
       );
       console.log("-------------------------------------");


       monitoredItem.on("changed",function(dataValue){
          //console.log(" value = ",dataValue.value.value);
          //console.log(" sourceTimestamp = ",dataValue.sourceTimestamp.toISOString());
          //console.log(JSON.stringify(dataValue));
          var Node = {nodeId: nodeid, nodeName: "111" , nodeValue: dataValue.value.value , nodeTimestamp: dataValue.sourceTimestamp.toISOString()};
          var arrayNode = Object.keys(Node).map(function(k) { return Node[k] });
          //console.log(JSON.stringify(Node));
          nodes.push(arrayNode);

        //  console.log(nodes);
      });

Answer 2

现在您可以使用方法the_subscription。monitorItems()

node.js opc ua许多受监控的项目

2 个答案: