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Local interface data is overwritten?

Created by: @Nick at: 11/4/2011 4:38 PM (3 Replies)

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11/4/2011 4:38 PM	Rate (0)
@Nick Advanced Member Joined: 11/17/2010 Last visit: 11/25/2020 Posts: 81 Rating: (2)	Hi Guys, Question about a problem that i havediscoverd last week during testing. We are using a lot of functionblocks with multiple instances inside. So 3 or 4 FB's (as multiple instances)in a FB is normal in our program. In the main FB i have a for example 3 input booleans( as interface IN). The FB is called in OB1, and the 3 inputs arecoupled with a global adress. In OB 1 the signals are high, and in the FB the signals are zero. (I'm sure i monitor the right FB because i also tried withcall enviroment) The solution that i haven found is to add a spare word or int before the interface input in the FB. It seems like somethingis overwritting my inputs signals? Does any body recognize this problem? I Have no idea where to search, because the PLC is running a have non fault messages. Thanks in advance!

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11/4/2011 6:34 PM	Rate (0)
Marciano Bronze Member Joined: 4/30/2007 Last visit: 6/17/2025 Posts: 231 Rating: (23)	Hello Nick, First make sure that your Instance DB's are updated, the Block Check Conscistencyoption in the Manager. Monitoring multiple instances FB's can be an impossible mission, one alternative for you is open and check online the Intance DB's, there you would see for sure the state of your inputs and any other STAT. I hope this helps! Marciano

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11/4/2011 7:24 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating: (1368)	Dear @Nick, These links would be helpful: How do you create and update multiple instances? How do you update invalid block calls (time stamp conflicts) in calling blocks? How do you perform a block-consistency check following changes in the STEP 7 program? Best regards
	Demo Channel on Youtube
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11/4/2011 8:06 PM	Rate (0)
@Nick Advanced Member Joined: 11/17/2010 Last visit: 11/25/2020 Posts: 81 Rating: (2)	Thanks Marciano and Hdhosseini for your reply, Monday i'm going back to customer and try some things that are in the links. I have to tell you that i'm sure that there are no time stamp conflicts and I always use the "check block consistency" and there were no errors detected. If the problem still occurs next week, i will post some new information next weekend! If someone have any other ideas, please inform me! Thanks! @Nick

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