Reading multiple items with node-red-contrib-opcua

Industrial
1

I am including several production lines into my data-gathering program. They use OPC-UA to offer me the information. Single parameter readings are not a problem anymore: I send the nodeid for the parameter I want to read, and I get a message with that single parameter. This is fine.

However, we have 3 production lines (times 3) and we're talking about reading hundreds of parameters. Having a full message for each one will be an incredible overhead, so I want to use the read multiple function.

This is the flow picture:

image
image1085×594 81 KB

And this is that part of the flow:

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My OPC-UA node is configured like this:
image

After start, I inject the topic "clearitems" in the node, to make sure I don't double add parameters.

Then I add the multiple parameters for the test, at 0.5s intervals, just to make sure the node can get them all (I was hoping to reduce the time maybe to 0,1s later). To do that, I inject a message with an empty payload and empty topic, and use the item-opcua for each parameter, configured as follows:
image

The resulting message goes into the OPC-UA Client node, and the parameters are added.

Then, when I inject a message with the topic "readmultiple" in the OPC-UA node, I get the expected result, something like this:

image

And this looks promising, but when I try to read again all the inserted parameters, and inject "readmultiple" to the OPC-UA client for a second time, then I get the following:

image
image772×557 29.3 KB

I asked a question on the github page for the project, but they do not seem to understand the issue and they state I must be doing something wrong. I can't guess what that would be. Any thoughts?

1 Like
2

I am currently in the same situation, where I have to read a lot of values.In this case, it is recommended to use "Subscribe"-Mode in the OPC-UA-Client Node.
Since we are pretty much in the same situation:
Are you running nodered on a raspberry pi/pc?
What are your experiences so far with number of OPC-UA-Clients you can use at the same time?

3

The machines I'm getting the data from are chemical processes that run quite slow. Therefore, the update frequency is not critical, and I'm multiple-reading the parameters just once every 5 seconds, more than enough to detect any variations.

In fairness, I'd probably read once every 8 or 10 seconds and have approximately the same accuracy, but I want to make sure that I detect when a new part is entering the line, and with 5 seconds the sensor will detect it at least for 2 readings, so it's more than enough for me.

I'm running node-red on a dedicated VM with PM2 installed, so I was able to get logs and monitor resources more easily.
The physical CPU is actually a Xeon CPU, but I have a single core and about 8 GB of RAM assigned for the VM. In any case, my flows are not hogging too much resources anyway.
image

At the moment I'm controlling about 35 machines using the S7 node, 6 mobile robots (using a REST API and the http nodes), and 6 production lines using OPC-UA nodes (200+ parameters each). I also get data tracking info from 3 MSSQL databases and log my own info (data tracking + event logging) to a MySQL database.

In the near future I plan on adding 2 more OPC-UA lines, as well as getting data from more DBs and several machines running with OMRON PLCs (it's a work in progress).

The CPU usage is often between 3 and 8%, and when OPC-UA polls from all the machines simultaneously it goes to about 12%, then down again. I could alternate the polling times (maybe give about 0.5~1s of delay between lines to avoid the usage peaks and get a more consistent usage, but at the moment I think I can afford it. It's not like a 4~5% usage jump in a single core is a big deal, specially when I'm always under 15% usage.

4

Hi @OriolFM ,

I tried to debug the flow using an S71500 (OPC UA) and here is what I found:

  1. The subscription as @nico25 suggested works. Each time the process change there is an update in the client and there are no errors coming. When using "multiple inputs" I got this message after the "join topic" node: Client node error on: SCHMID Preclean 1 error: [{}]

    image
    image1459×498 58.3 KB

  2. I did not use "opc_ua_item". Instead, directly inject the topic in the client using "inject". (payload:timestamp, topic=string["ns=3;s="CFC_1/reg_c_2"."HMI"."iAut";datatype:Boolean]). Everytime I update the values of the items the formating works perfect.

    image
    image905×882 31.8 KB

So I am not an expert, just a couple of months experimenting with NR.
I found the case really close to what I am trying to accomplish at work.

Here is a flow I used to subscribe to the OPC and retrieve multiple data in a dashboard.

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5

I'm not using join anymore. I'm using readmultiple passing "ALL" on the payload so I get an array with all the values in a single message. I have to do some normalization of the objecto to trim the values and put them all together in an object with human-readable key/value pairs, but it's definitely doable.

I already suggested the node creator that instead of using many item nodes to add the list of variables, it could be done in a variable list (which is essentially a CSV file, like the S7 node does with Siemens PLCs, allowing it to import/export CSVs or edit the variables directly on the endpoint).

We'll see how it goes, but for now, I'm fine.

As I said, I'm polling instead of subscribing because I prefer getting the whole object in a go. Performance is not an issue at this point, and the polling frequency is low (once every 5 seconds), so the VM can take it perfectly (never goes over 15% CPU usage on a single thread).

1 Like
6

Guys for some reason OPC-Communication between my RaspPi and my S7 only works for around 1-2min and then it stops working. As mentioned before I am using subscription-mode for reading the values.
I´ll give you a snippet of my flow:

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        "type": "inject",
        "z": "6a150d561d4e6972",
        "name": "Tool ID 0",
        "props": [
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                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
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        ],
        "repeat": "2",
        "crontab": "",
        "once": true,
        "onceDelay": "0.2",
        "topic": "ns=3;s=\"Online_RFIDs\".\"THIS\"[0].\"CurrentToolID\";datatype=Number",
        "payloadType": "date",
        "x": 230,
        "y": 360,
        "wires": [
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    },
    {
        "id": "82e86f9e7f8bc1d4",
        "type": "inject",
        "z": "6a150d561d4e6972",
        "name": "Tool ID1",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "2",
        "crontab": "",
        "once": true,
        "onceDelay": "0.2",
        "topic": "ns=3;s=\"Online_RFIDs\".\"THIS\"[1].\"CurrentToolID\";datatype=Number",
        "payloadType": "date",
        "x": 220,
        "y": 395.714285714286,
        "wires": [
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    },
    {
        "id": "5b8d61396a7ff47f",
        "type": "inject",
        "z": "6a150d561d4e6972",
        "name": "Tool ID2",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
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        ],
        "repeat": "2",
        "crontab": "",
        "once": true,
        "onceDelay": "0.2",
        "topic": "ns=3;s=\"Online_RFIDs\".\"THIS\"[2].\"CurrentToolID\";datatype=Number",
        "payloadType": "date",
        "x": 220,
        "y": 441.8367346938778,
        "wires": [
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                "c6f8120301d4870c"
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    {
        "id": "a263a110c21bdc23",
        "type": "inject",
        "z": "6a150d561d4e6972",
        "name": "Tool ID3",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "2",
        "crontab": "",
        "once": true,
        "onceDelay": "0.2",
        "topic": "ns=3;s=\"Online_RFIDs\".\"THIS\"[3].\"CurrentToolID\";datatype=Number",
        "payloadType": "date",
        "x": 220,
        "y": 487.9591836734696,
        "wires": [
            [
                "c6f8120301d4870c"
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        ]
    },
    {
        "id": "b0f55e0b7b7f7354",
        "type": "inject",
        "z": "6a150d561d4e6972",
        "name": "Tool ID 0 CycleCount",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
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        ],
        "repeat": "2",
        "crontab": "",
        "once": true,
        "onceDelay": "0.5",
        "topic": "ns=3;s=\"Online_RFIDs\".\"THIS\"[0].\"CycleCountfromSQL\";datatype=Number",
        "payloadType": "date",
        "x": 260,
        "y": 534.0816326530614,
        "wires": [
            [
                "c6f8120301d4870c"
            ]
        ]
    },
    {
        "id": "2eec11d460917830",
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                "e28ab18f17c1264d"
            ],
            [
                "cafc5482ef5a16b9"
            ],
            [
                "3395d569053361fd"
            ],
            [
                "80494224f14f6a8c"
            ],
            [
                "232fcbf2cac15bb7"
            ],
            [
                "3e620741ea9ceced"
            ],
            [
                "494e19f7b29f94f4"
            ],
            [
                "123cdb5bc4e2894f"
            ],
            [
                "c99880c64f53e0d3"
            ],
            [
                "395e9ef8f3f42b57"
            ],
            [
                "224ab59e13b7c941"
            ],
            [
                "ee6d7daa663f6d45"
            ],
            [
                "27bc30e7fe463c8e"
            ],
            [
                "98a52dfae5b3efe4"
            ],
            [
                "d5c8ad7f409b16a6"
            ],
            [
                "b3afd205e2082d6f"
            ],
            [
                "6285c8be622a8db2"
            ],
            [
                "3d352024d68d07ba"
            ],
            [
                "c132ff3ebe63b90d"
            ],
            [
                "3346b8b2f56a66c1"
            ],
            [
                "f8306190925e7b1e"
            ],
            [
                "fb9bd7801a99874a"
            ],
            [
                "845219d3b7664480"
            ],
            [
                "bad2a391de3049a7"
            ],
            [
                "78b415e6c0e40792"
            ],
            [
                "4b4fbc471bf97658"
            ],
            [
                "5243f1efb801c45e"
            ],
            [
                "10998ab0fb65724c"
            ],
            [
                "5ec50f561b189e66"
            ],
            [
                "91cec7947aa20840"
            ],
            [
                "213bc82ac144d46f"
            ],
            [
                "b9d40884a342caa6"
            ],
            [
                "27d59bb6db6fd57c"
            ],
            [
                "27c705b30ac1e9e1"
            ],
            [
                "8b7dff89709b5ca8"
            ],
            [
                "8f96734a7e1f75e4"
            ]
        ]
    },
    {
        "id": "e00e2f355739f286",
        "type": "OpcUa-Endpoint",
        "endpoint": "opc.tcp://172.16.200.170:4840",
        "secpol": "None",
        "secmode": "None",
        "login": false
    }
]

In total i need to read around 350 values from my S7.
I do the reading in 6 different subflows, do you think this might cause the issue?

Thoughts?

EDIT: Could figure it out. Needed to rasie Intervaltime for OPC-Communication on S7 side.

7

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