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How to access array of UDT element inside VbScript SmartTags

Created by: AutoGen_8232727 at: 8/25/2025 4:01 AM (3 Replies)

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8/25/2025 4:01 AM	Rate (0)
AutoGen_8232727 Joined: 3/19/2025 Last visit: 8/30/2025 Posts: 2 Rating: (0)	Hello I have been struggling to access UDT element under SmartTags in VbScript for loop as I have no tag system event at first loop. see the attached for the array, tag structure screenshots. when i tried to access like this it work SmartTags("HMI_INTERFACE_Alarms{0}_AlarmStruct_ID") but in a loop when trying to access like SmartTags("HMI_INTERFACE_Alarms{" & CStr(i) &"}_AlarmStruct_ID") or SmartTags("HMI_INTERFACE_Alarms{" & i & "}_AlarmStruct_ID") I get no tag system event at this line. can someone help please. Thanks. Attachment Screenshots.png (9 Downloads)

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8/26/2025 2:24 PM	Rate (0)
Prof. Frink Platinum Expert Joined: 7/5/2013 Last visit: 9/1/2025 Posts: 3235 Rating: (526)	Hi, check the posts under the following entry please: VBScript FOR loop with array index as tag not working I guess, the same was discussed there, but currently I have no time to get into it. Regards, Frink
	Pi is exactly three! All you have to do is think of things which people need but which don’t exist yet.
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8/29/2025 11:32 AM	Rate (0)
Murof Platinum Expert Joined: 8/3/2009 Last visit: 9/1/2025 Posts: 16284 Rating: (1930)	Hello if you use WinCC Comfort/Advanced there is a limitation in accessing tags from user defined datatypes (UDTs): https://docs.tia.siemens.cloud/r/en-us/v20/vbs-object-model-panels-comfort-panels-rt-advanced-rt-professional/objects-panels-comfort-panels-rt-advanced/smarttags-panels-comfort-panels-rt-advanced -> "Current system behavior for dynamic access to elements of a user data type" Bye Murof
	If this Information really helps, you could use the Rate function
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8/30/2025 1:47 AM	Rate (0)
AutoGen_8232727 Joined: 3/19/2025 Last visit: 8/30/2025 Posts: 2 Rating: (0)	Hello, Finally it worked after several trials , Prof. Frink Suggested forum was helpful. I needed to create list of dummy tags for every access of my UDT arrays then all elements in the loop will be accusable. But it would be tiresome if we have 1000+ array to list them as dummy in the script, if someone have better idea than this please share. see below solution Sub inittest() Dim Initialized Dim j, dummy If Initialized <> True Then dummy = SmartTags("HMI_INTERFACE_Alarms.AlarmsDB[0].AlarmStruct.ID") dummy = SmartTags("HMI_INTERFACE_Alarms.AlarmsDB[1].AlarmStruct.ID") dummy = SmartTags("HMI_INTERFACE_Alarms.AlarmsDB[2].AlarmStruct.ID") ..... Initialized = True End If End Sub 'Below script can access the UDT array elements by the loop Sub test() Dim i inittest() For i = 0 To 9 SmartTags("HMI_INTERFACE_Alarm_ID_Copy")(i) = SmartTags("HMI_INTERFACE_Alarms.AlarmsDB[" & CStr(i) & "].AlarmStruct.ID") Next End Sub Thank you everyone.

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This contribution was helpful to 1 thankful Users Prof. Frink

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