OPC structure conversion to tag

Ignition
1

Hello,

I am using the method described in this topic: OPC UA struct data type?

My structure in the controller is highly developed. All devices connected to the PLC are represented as a structure. Of course, it is possible to read them as a JSON document and separate them with the described method, however, I have a question whether such passing of a large JSON format for separation will not negatively affect the performance?

The OPC structure from the PLC is about 2000 tags to be separated and there will be dozens of such controllers - OPC servers - connected to Ignition.

Greetings

2

What server is this? Are the structure members also exposed as their own nodes in the address space?

There is of course some performance overhead to this approach, but in some cases you have no alternative.

3

This is a WAGO PLC with the ability to activate OPC UA as a server. Another approach would require changing the PLC program to issue data not in a structure but serially in the form of variables.

Here an example: WAGO PLC's Onboard OPC UA Server Tutorial with Ignition SCADA - YouTube

4 
My JSON sample: 

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5

Hmm. Well, it's an array of decent sized structures, but at least they aren't deeply nested.

I'm not really sure what advice to offer you. Yes there's overhead. No, I don't know how much. If you're going to be writing to these values from Ignition on a regular basis it's probably better if they're not structures. Same if they'll update frequently.

Does this server expose the array elements and structure members as their own nodes, or just one big top level node with a single struct array value?

6

tip: You can wrap walls of text in <details> tags
It's written like this:

<details>
<summary>Click here for wall of text !</summary>
# wall of text
</details>

Which ends up looking like this:

Click here for wall of text ! # wall of text

Then, when you're posting code, use code formatting. You can either use this button:
image
or wrap your code with triple backticks, like this:

```language
code here
```

which you can put in a details block:

click here for json 
[
  {
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    "Internal_Temperature":36.7,
    "Total_Apparent_Power":8525,
    "Total_DC_Power":8.655001,
    "AB_Line_Voltage":606.2,
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    "Phase_A_Voltage":606.2,
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    "Grid_frequency_01":50.0,
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    "CA_Line_Voltage":605.8,
    "Phase_A_Voltage":608.0,
    "Phase_B_Voltage":608.60004,
    "Phase_C_Voltage":605.8,
    "Phase_A_Current":9.3,
    "Phase_B_Current":9.3,
    "Phase_C_Current":9.400001,
    "Total_Active_Power":9.0060005,
    "Total_Reactive_Power":234,
    "Power_Factor":100.0,
    "Grid_frequency_01":50.0,
    "Work_State_AP1":0,
    "Alarm_Year":0,
    "Alarm_Month":0,
    "Alarm_Day":0,
    "Alarm_Hour":0,
    "Alarm_Minute":0,
    "Alarm_Second":0,
    "Alarm_Code":0,
    "Nominal_Reactive":75.0,
    "Insulation_Resistance":227,
    "Active_Power_Setpoint":125000,
    "Reactive_Power_Setpoint":0,
    "Work_State_AP2":131073,
    "Meter_Power":-1,
    "Meter_A_Phase_Power":-1,
    "Meter_B_Phase_Power":-1,
    "Meter_C_Phase_power":-1,
    "Load_Power":-1,
    "Daily_Export_Energy":4.294967295E8,
    "Total_Export_Energy":4.294967295E8,
    "Daily_Import_Energy":4.294967295E8,
    "Total_Import_Energy":4.294967295E8,
    "Daily_Energy_Consumption":4.294967295E8,
    "Total_Energy_Consumption":4.294967295E8,
    "Daily_Running_Time":301,
    "Preset_Country":16,
    "MPPT_1_Voltage":1022.10004,
    "MPPT_1_Current":8.900001,
    "MPPT_2_Voltage":6553.5,
    "MPPT_2_Current":6553.5,
    "MPPT_3_Voltage":6553.5,
    "MPPT_3_Current":6553.5,
    "MPPT_4_Voltage":6553.5,
    "MPPT_4_Current":6553.5,
    "MPPT_5_Voltage":6553.5,
    "MPPT_5_Current":6553.5,
    "MPPT_6_Voltage":6553.5,
    "MPPT_6_Current":6553.5,
    "MPPT_7_Voltage":6553.5,
    "MPPT_7_Current":6553.5,
    "MPPT_8_Voltage":6553.5,
    "MPPT_8_Current":6553.5,
    "MPPT_9_Voltage":6553.5,
    "MPPT_9_Current":6553.5,
    "MPPT_10_Voltage":6553.5,
    "MPPT_10_Current":6553.5,
    "MPPT_11_Voltage":6553.5,
    "MPPT_11_Current":6553.5,
    "MPPT_12_Voltage":6553.5,
    "MPPT_12_Current":6553.5,
    "Monthly_Power_Yields":2241.4,
    "Total_Power_Yields":3.769892944E9,
    "Negative_Voltage_Ground":-5104.0,
    "Bus_Voltage":10221.0,
    "Grid_Frequency_001":5000.0,
    "PID_work_state":0,
    "PID_alarm_code":0,
    "String_1_Current":655.35,
    "String_2_Current":655.35,
    "String_3_Current":655.35,
    "String_4_Current":655.35,
    "String_5_Current":655.35,
    "String_6_Current":655.35,
    "String_7_Current":655.35,
    "String_8_Current":655.35,
    "String_9_Current":655.35,
    "String_10_Current":655.35,
    "String_11_Current":655.35,
    "String_12_Current":655.35,
    "String_13_Current":655.35,
    "String_14_Current":655.35,
    "String_15_Current":655.35,
    "String_16_Current":0.01,
    "String_17_Current":0.01,
    "String_18_Current":655.35,
    "String_19_Current":655.35,
    "String_20_Current":575.24,
    "String_21_Current":0.79999995,
    "String_22_Current":604.32,
    "String_23_Current":102.21,
    "String_24_Current":50.0,
    "Year":2022,
    "Month":11,
    "Day":14,
    "Hour":12,
    "Minute":29,
    "Second":23,
    "Start":true,
    "Stop":false,
    "Power_limitations_On":true,
    "Power_limitations_Off":false,
    "Power_limitations_value":100.0,
    "Export_power_On":false,
    "Export_power_Off":false,
    "Export_power_value":65535,
    "C_Transformer_output":0,
    "C_Transformer_range":0,
    "Current_Transformer":0,
    "Export_power_percentage":0.0,
    "Installed_PV_Power":0.0,
    "Power_Factor_Set":0.0,
    "Scheduling_to_AAO":0,
    "Night_SVG_Switch":0,
    "Reactive_Adjustment_Mode":0,
    "Reactive_Adjust_Off":false,
    "Reactive_Adjust_Valid":false,
    "Reactive_Adjust_Perc":false,
    "Reactive_Power_Percentage":0.0,
    "Power_Limit_Adjust":0.0,
    "Reactive_Power_Adjust":0.0,
    "PID_Recovery":0,
    "Anti_PID":0,
    "Full_Day_PID":0,
    "Set_Start":false,
    "Set_Stop":false,
    "Work_RUN":true
  },
  {
    "SN":[
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0,
      0
    ],
    "Device_Type":315,
    "Nominal_Active_Power":125.0,
    "Output_Type":2,
    "Daily_Power_Yield":19.800001,
    "Total_Power_Yield":554038,
    "Total_Running_Time":16240,
    "Internal_Temperature":35.600002,
    "Total_Apparent_Power":8889,
    "Total_DC_Power":9.024,
    "AB_Line_Voltage":608.10004,
    "BC_Line_Voltage":608.7,
    "CA_Line_Voltage":605.7,
    "Phase_A_Voltage":608.10004,
    "Phase_B_Voltage":608.7,
    "Phase_C_Voltage":605.7,
    "Phase_A_Current":9.400001,
    "Phase_B_Current":9.400001,
    "Phase_C_Current":9.400001,
    "Total_Active_Power":8.889001,
    "Total_Reactive_Power":200,
    "Power_Factor":100.0,
    "Grid_frequency_01":49.9,
    "Work_State_AP1":0,
    "Alarm_Year":0,
    "Alarm_Month":0,
    "Alarm_Day":0,
    "Alarm_Hour":0,
    "Alarm_Minute":0,
    "Alarm_Second":0,
    "Alarm_Code":0,
    "Nominal_Reactive":75.0,
    "Insulation_Resistance":169,
    "Active_Power_Setpoint":125000,
    "Reactive_Power_Setpoint":0,
    "Work_State_AP2":131073,
    "Meter_Power":-1,
    "Meter_A_Phase_Power":-1,
    "Meter_B_Phase_Power":-1,
    "Meter_C_Phase_power":-1,
    "Load_Power":-1,
    "Daily_Export_Energy":4.294967295E8,
    "Total_Export_Energy":4.294967295E8,
    "Daily_Import_Energy":4.294967295E8,
    "Total_Import_Energy":4.294967295E8,
    "Daily_Energy_Consumption":4.294967295E8,
    "Total_Energy_Consumption":4.294967295E8,
    "Daily_Running_Time":301,
    "Preset_Country":16,
    "MPPT_1_Voltage":1008.10004,
    "MPPT_1_Current":9.0,
    "MPPT_2_Voltage":6553.5,
    "MPPT_2_Current":6553.5,
    "MPPT_3_Voltage":6553.5,
    "MPPT_3_Current":6553.5,
    "MPPT_4_Voltage":6553.5,
    "MPPT_4_Current":6553.5,
    "MPPT_5_Voltage":6553.5,
    "MPPT_5_Current":6553.5,
    "MPPT_6_Voltage":6553.5,
    "MPPT_6_Current":6553.5,
    "MPPT_7_Voltage":6553.5,
    "MPPT_7_Current":6553.5,
    "MPPT_8_Voltage":6553.5,
    "MPPT_8_Current":6553.5,
    "MPPT_9_Voltage":6553.5,
    "MPPT_9_Current":6553.5,
    "MPPT_10_Voltage":6553.5,
    "MPPT_10_Current":6553.5,
    "MPPT_11_Voltage":6553.5,
    "MPPT_11_Current":6553.5,
    "MPPT_12_Voltage":6553.5,
    "MPPT_12_Current":6553.5,
    "Monthly_Power_Yields":2195.3,
    "Total_Power_Yields":2.31741858E9,
    "Negative_Voltage_Ground":-5043.0,
    "Bus_Voltage":10081.0,
    "Grid_Frequency_001":4999.0,
    "PID_work_state":0,
    "PID_alarm_code":0,
    "String_1_Current":655.35,
    "String_2_Current":655.35,
    "String_3_Current":655.35,
    "String_4_Current":655.35,
    "String_5_Current":655.35,
    "String_6_Current":655.35,
    "String_7_Current":655.35,
    "String_8_Current":655.35,
    "String_9_Current":655.35,
    "String_10_Current":655.35,
    "String_11_Current":655.35,
    "String_12_Current":655.35,
    "String_13_Current":655.35,
    "String_14_Current":655.35,
    "String_15_Current":655.35,
    "String_16_Current":0.01,
    "String_17_Current":0.01,
    "String_18_Current":655.35,
    "String_19_Current":655.35,
    "String_20_Current":353.61,
    "String_21_Current":0.84,
    "String_22_Current":604.93,
    "String_23_Current":100.81,
    "String_24_Current":49.989998,
    "Year":2022,
    "Month":11,
    "Day":14,
    "Hour":12,
    "Minute":25,
    "Second":46,
    "Start":true,
    "Stop":false,
    "Power_limitations_On":true,
    "Power_limitations_Off":false,
    "Power_limitations_value":100.0,
    "Export_power_On":false,
    "Export_power_Off":false,
    "Export_power_value":65535,
    "C_Transformer_output":0,
    "C_Transformer_range":0,
    "Current_Transformer":0,
    "Export_power_percentage":0.0,
    "Installed_PV_Power":0.0,
    "Power_Factor_Set":0.0,
    "Scheduling_to_AAO":0,
    "Night_SVG_Switch":0,
    "Reactive_Adjustment_Mode":0,
    "Reactive_Adjust_Off":false,
    "Reactive_Adjust_Valid":false,
    "Reactive_Adjust_Perc":false,
    "Reactive_Power_Percentage":0.0,
    "Power_Limit_Adjust":0.0,
    "Reactive_Power_Adjust":0.0,
    "PID_Recovery":0,
    "Anti_PID":0,
    "Full_Day_PID":0,
    "Set_Start":false,
    "Set_Stop":false,
    "Work_RUN":true
  }
]
7

If you have full control over the modeling, I'd considering something like this.

I think this is too much unrelated data to stuff into one structured value. The problem is going to be that when any of those values changes the entire new structure value change has to be reported to the client.

I think the proper way to model this would be to represent your connected devices as an ObjectType (e.g. "MyDeviceType"), and add all that data as individual VariableNodes that an instance of that device object would have.

At the top level you wouldn't have an array of these, but rather just some number of instances, "MyDevice1", "MyDevice2", etc...

8

I will consider, such an option however, the downside is the need to modify the PLC codes on many devices. Also, I think it is safer. The array is sizable, it changes every second and a whole of JSON circulates in functions. Thank you for your feedback.

9

What about using Ignition UDTs and perform a direct variable addressing? I'm not familiar with WAGO but even with Siemens you can expose UDTs but is then always possible to address each single element as a separate nodeid.
Perhaps using the UDT json structure to automatically create this 1:1 mapping. This would avoid you to chance PLC code.

10

The structure in WAGO is transmitted as a JSON with the variables listed. Perhaps it is a matter of OPC implementation. In another SCADA managed to break it up while in still other OPC software also sent collectively as one JSON. In servers such as Ignition and Kepserver, of course, there are also references to a single node.