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Error 2156935121 when writing to text file in WinCC Unified V20

Created by: MindFlayer at: 2/24/2025 2:19 PM (6 Replies)

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2/24/2025 2:19 PM	Rate (0)
MindFlayer Regular Member Joined: 11/13/2018 Last visit: 12/15/2025 Posts: 91 Rating: (13)	Hi everyone, I’m encountering an issue while trying to write to a text file using a script in WinCC Unified V20. I keep getting error code 2156935121 (write permission). I have administrator rights on my PC, and the same error occurs on other PCs as well. Additionally, the code snippet I’m using to browse a folder doesn’t seem to work either. Has anyone experienced this issue or know how to resolve it? Any help would be greatly appreciated! Below is the code I’m using: HMIRuntime.FileSystem.WriteFile("C:\\Test.csv", "test text", "utf8").then( function() { HMIRuntime.Trace("Write file finished successfully"); }).catch(function(errCode) { HMIRuntime.Trace("Write failed, Error: " + errCode); });
	Last edited by: MindFlayer at: 02/24/2025 14:19:49 Like it? Rate it!
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2/24/2025 2:39 PM	Rate (1)
Pau97 Joined: 7/27/2023 Last visit: 10/28/2025 Posts: 131 Rating: (9)	Hi! I recommend you try this path: "C:\\Users\\Public" - SIMATIC WinCC Unified - Tips and Tricks for Scripting (JavaScript): https://support.industry.siemens.com/cs/ww/en/view/109758536
	Last edited by: Pau97 at: 02/24/2025 14:39:30
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This contribution was helpful to 1 thankful Users MindFlayer

2/24/2025 3:05 PM	Rate (0)
rdoliveira Platinum Expert Joined: 4/26/2012 Last visit: 12/19/2025 Posts: 1653 Rating: (191)	Hello, take a look at this link LINK Try putting it in a folder. It may be the folder permissions that are missing. Good luck.
	Last edited by: rdoliveira at: 02/24/2025 15:07:14 edit "Always make a backup before performing any tests and check the best time to do so. Obrigado.
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This contribution was helpful to 1 thankful Users MindFlayer

2/24/2025 3:08 PM	Rate (0)
MindFlayer Regular Member Joined: 11/13/2018 Last visit: 12/15/2025 Posts: 91 Rating: (13)	Hello Pau97 and rdoliveira, Thank you for your quick response. I can confirm that I'm able to write to the public folder without any issues. However, I’m curious about writing to other folders. Could someone clarify how I can achieve this or explain me the limitations of WinCC Unified in this regard? Any insights or guidance would be greatly appreciated!
	Last edited by: MindFlayer at: 02/24/2025 15:10:08 Like it? Rate it!
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2/24/2025 3:19 PM	Rate (0)
rdoliveira Platinum Expert Joined: 4/26/2012 Last visit: 12/19/2025 Posts: 1653 Rating: (191)	Hi, try using / C:/test/Test.csv I used it with await await HMIRuntime.FileSystem.WriteFile........ good luck.
	Last edited by: rdoliveira at: 02/24/2025 15:20:59 edit "Always make a backup before performing any tests and check the best time to do so. Obrigado.
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This contribution was helpful to 1 thankful Users MindFlayer

2/24/2025 3:27 PM	Rate (1)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 12/24/2025 Posts: 4365 Rating: (650)	Hi MindFlayer, It does not matter whether you are allowed to write to a certain path or not. This is because the WinCC Unified Runtime is executed as the service user "WCCILScsService". Please refer to the manual for details: It must be ensured that the "WCCILScsService" service user under which Runtime is running has read and write rights to the directory in which the logs are stored. Kind regards Stefan

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This contribution was helpful to 1 thankful Users MindFlayer

2/25/2025 10:21 AM	Rate (0)
MindFlayer Regular Member Joined: 11/13/2018 Last visit: 12/15/2025 Posts: 91 Rating: (13)	Hi Stefan Arcularius, Thank you for your response. Now it's clear!
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