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Simotion “Error occurred while reading a system or I/O variable”

Created by: Ziemens at: 8/17/2009 12:52 PM (3 Replies)

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8/17/2009 12:52 PM	Rate (0)
Ziemens Silver Member Joined: 3/2/2007 Last visit: 9/9/2025 Posts: 990 Rating: (5)	Hy, I have a D445 which goes to stop after run reached at power up. The following message is displayed in the diagnostic buffer: “Error occurred while reading a system or I/O variable” Appreciate your help.
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8/17/2009 1:05 PM	Rate (0)
ChristophD Grandmaster-Expert Joined: 5/12/2006 Last visit: 9/17/2025 Posts: 22710 Rating: (3071)	Hello, in the details of the message you can see from which program the access was occured. Normaly the Error occurrs when you read/write IO's from not connected Peripherie or inactiv TO's. Regards Christoph

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8/17/2009 1:31 PM	Rate (0)
Ziemens Silver Member Joined: 3/2/2007 Last visit: 9/9/2025 Posts: 990 Rating: (5)	Hy, can I bypass this error (like we do with “SystemInterruptTasks”)?
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8/17/2009 2:48 PM	Rate (0)
ChristophD Grandmaster-Expert Joined: 5/12/2006 Last visit: 9/17/2025 Posts: 22710 Rating: (3071)	Hello, bypass is not so easy. There are two ways: 1.) access the variables not directly use the functions _set-/_getsafevalue to access io-variables and/or systemvariables 2.) when the error occurrs by accessing a io-variable then you can configure a IO strategy in the IO Browser (CPU-STOP; Last value; Substitute value) set the strategy to Last Value or Substitute value Regards Christoph

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