First ,you need an OPC UA Item node in front of the OPC UA Client node.Check in the picture below for detail.
Additionally , you may use another software such as UaExpert to verify you opc server is working well.
An example for your reference.
[
{
"id": "b508aa4f81d0d6ea",
"type": "tab",
"label": "娴佺▼ 1",
"disabled": false,
"info": "",
"env": []
},
{
"id": "ce47e8b78311a345",
"type": "OpcUa-Endpoint",
"endpoint": "opc.tcp://localhost:54840",
"secpol": "None",
"secmode": "None",
"none": true,
"login": false,
"usercert": false,
"usercertificate": "",
"userprivatekey": ""
},
{
"id": "9fbb37bba5b5057d",
"type": "modbus-client",
"name": "",
"clienttype": "simpleser",
"bufferCommands": true,
"stateLogEnabled": false,
"queueLogEnabled": false,
"failureLogEnabled": true,
"tcpHost": "127.0.0.1",
"tcpPort": "502",
"tcpType": "DEFAULT",
"serialPort": "/dev/ttyS4",
"serialType": "RTU",
"serialBaudrate": "9600",
"serialDatabits": "8",
"serialStopbits": "1",
"serialParity": "none",
"serialConnectionDelay": "100",
"serialAsciiResponseStartDelimiter": "0x3A",
"unit_id": 1,
"commandDelay": 1,
"clientTimeout": 1000,
"reconnectOnTimeout": true,
"reconnectTimeout": 2000,
"parallelUnitIdsAllowed": true,
"showWarnings": true,
"showLogs": true
},
{
"id": "e950412533eed178",
"type": "debug",
"z": "b508aa4f81d0d6ea",
"name": "debug 1",
"active": false,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "false",
"statusVal": "",
"statusType": "auto",
"x": 620,
"y": 140,
"wires": []
},
{
"id": "f0c0776d21bf79f7",
"type": "OpcUa-Client",
"z": "b508aa4f81d0d6ea",
"endpoint": "ce47e8b78311a345",
"action": "write",
"deadbandtype": "a",
"deadbandvalue": 1,
"time": 10,
"timeUnit": "s",
"certificate": "n",
"localfile": "",
"localkeyfile": "",
"securitymode": "None",
"securitypolicy": "None",
"folderName4PKI": "",
"name": "鍐欏叆鏈嶅姟鍣?,
"x": 410,
"y": 140,
"wires": [
[
"e950412533eed178"
]
]
},
{
"id": "9c741f3ac1bfd2a9",
"type": "OpcUa-Item",
"z": "b508aa4f81d0d6ea",
"item": "ns=1;s=pressure",
"datatype": "Double",
"value": "",
"name": "",
"x": 420,
"y": 60,
"wires": [
[
"f0c0776d21bf79f7"
]
]
},
{
"id": "4f42326772323433",
"type": "OpcUa-Item",
"z": "b508aa4f81d0d6ea",
"item": "ns=1;s=pressure",
"datatype": "Double",
"value": "",
"name": "",
"x": 240,
"y": 380,
"wires": [
[
"dce8b173b8cf3390"
]
]
},
{
"id": "dce8b173b8cf3390",
"type": "OpcUa-Client",
"z": "b508aa4f81d0d6ea",
"endpoint": "ce47e8b78311a345",
"action": "read",
"deadbandtype": "a",
"deadbandvalue": 1,
"time": 10,
"timeUnit": "s",
"certificate": "n",
"localfile": "",
"localkeyfile": "",
"securitymode": "None",
"securitypolicy": "None",
"folderName4PKI": "",
"name": "浠庢湇鍔″櫒璇?,
"x": 450,
"y": 340,
"wires": [
[
"6d2b8f5608e9db13"
]
]
},
{
"id": "903b5b2dfdc6bb06",
"type": "inject",
"z": "b508aa4f81d0d6ea",
"name": "",
"props": [
{
"p": "payload"
},
{
"p": "topic",
"vt": "str"
}
],
"repeat": "2",
"crontab": "",
"once": false,
"onceDelay": 0.1,
"topic": "",
"payload": "",
"payloadType": "date",
"x": 180,
"y": 280,
"wires": [
[
"4f42326772323433"
]
]
},
{
"id": "6d2b8f5608e9db13",
"type": "debug",
"z": "b508aa4f81d0d6ea",
"name": "debug 2",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "false",
"statusVal": "",
"statusType": "auto",
"x": 620,
"y": 240,
"wires": []
},
{
"id": "bb1c6ccd1a959c23",
"type": "opcua-compact-server",
"z": "b508aa4f81d0d6ea",
"port": 54840,
"endpoint": "",
"productUri": "",
"acceptExternalCommands": true,
"maxAllowedSessionNumber": 10,
"maxConnectionsPerEndpoint": 10,
"maxAllowedSubscriptionNumber": 100,
"alternateHostname": "",
"name": "",
"showStatusActivities": false,
"showErrors": false,
"allowAnonymous": true,
"individualCerts": false,
"isAuditing": false,
"serverDiscovery": true,
"users": [],
"xmlsetsOPCUA": [],
"publicCertificateFile": "",
"privateCertificateFile": "",
"registerServerMethod": 1,
"discoveryServerEndpointUrl": "",
"capabilitiesForMDNS": "",
"maxNodesPerRead": 1000,
"maxNodesPerWrite": 1000,
"maxNodesPerHistoryReadData": 100,
"maxNodesPerBrowse": 3000,
"maxBrowseContinuationPoints": 10,
"maxHistoryContinuationPoints": 10,
"delayToInit": 1000,
"delayToClose": 200,
"serverShutdownTimeout": 100,
"addressSpaceScript": "function constructAlarmAddressSpace(server, addressSpace, eventObjects, done) {\n // server = the created node-opcua server\n // addressSpace = address space of the node-opcua server\n // eventObjects = add event variables here to hold them in memory from this script\n\n // internal sandbox objects are:\n // node = the compact server node,\n // coreServer = core compact server object for debug and access to NodeOPCUA\n // this.sandboxNodeContext = node context node-red\n // this.sandboxFlowContext = flow context node-red\n // this.sandboxGlobalContext = global context node-red\n // this.sandboxEnv = env variables\n // timeout and interval functions as expected from nodejs\n\n const opcua = coreServer.choreCompact.opcua;\n const LocalizedText = opcua.LocalizedText;\n const namespace = addressSpace.getOwnNamespace();\n\n const Variant = opcua.Variant;\n const DataType = opcua.DataType;\n const DataValue = opcua.DataValue;\n\n var flexServerInternals = this;\n\n this.sandboxFlowContext.set(\"pressure\", 0);\n\n coreServer.debugLog(\"init dynamic address space\");\n const rootFolder = addressSpace.findNode(\"RootFolder\");\n\n const myDevice = namespace.addFolder(rootFolder.objects, {\n \"browseName\": \"PN6400\"\n });\n const gpioFolder = namespace.addFolder(myDevice, { \"browseName\": \"parameters inputs\" });\n const isoInputs = namespace.addFolder(gpioFolder, {\n \"browseName\": \"Inputs\"\n });\n\n const paraInput = namespace.addVariable({\n \"organizedBy\": isoInputs,\n \"browseName\": \"pressure\",\n \"nodeId\": \"ns=1;s=pressure\",\n \"dataType\": \"Double\",\n \"value\": {\n \"get\": function () {\n return new Variant({\n \"dataType\": DataType.Double,\n \"value\": flexServerInternals.sandboxFlowContext.get(\"pressure\")\n });\n },\n \"set\": function (variant) {\n flexServerInternals.sandboxFlowContext.set(\n \"pressure\",\n parseFloat(variant.value)\n );\n return opcua.StatusCodes.Good;\n }\n }\n });\n\n //------------------------------------------------------------------------------\n // Add a view\n //------------------------------------------------------------------------------\n const viewDI = namespace.addView({\n \"organizedBy\": rootFolder.views,\n \"browseName\": \"PN6400-In\"\n });\n viewDI.addReference({\n \"referenceType\": \"Organizes\",\n \"nodeId\": paraInput.nodeId\n });\n done();\n}\n",
"x": 420,
"y": 240,
"wires": []
},
{
"id": "078da5faf0d4c676",
"type": "modbus-read",
"z": "b508aa4f81d0d6ea",
"name": "",
"topic": "",
"showStatusActivities": false,
"logIOActivities": false,
"showErrors": false,
"showWarnings": true,
"unitid": "6",
"dataType": "HoldingRegister",
"adr": "0",
"quantity": "1",
"rate": "2",
"rateUnit": "s",
"delayOnStart": false,
"startDelayTime": "",
"server": "9fbb37bba5b5057d",
"useIOFile": false,
"ioFile": "",
"useIOForPayload": false,
"emptyMsgOnFail": false,
"x": 110,
"y": 200,
"wires": [
[
"77b09260f0d695a7"
],
[
"b8be7f31e27c5ca2"
]
]
},
{
"id": "77b09260f0d695a7",
"type": "modbus-response",
"z": "b508aa4f81d0d6ea",
"name": "鐩戝惉",
"registerShowMax": 20,
"x": 270,
"y": 180,
"wires": []
},
{
"id": "b8be7f31e27c5ca2",
"type": "function",
"z": "b508aa4f81d0d6ea",
"name": "瑙ｆ瀽鍘嬪姏鍊?,
"func": "msg.payload = msg.payload.data[0];\nreturn msg;",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 230,
"y": 60,
"wires": [
[
"9c741f3ac1bfd2a9"
]
]
}
]
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