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Reading Analog Tag Values

Created by: Jimmy at: 5/30/2006 9:40 PM (5 Replies)

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5/30/2006 9:40 PM	Rate (0)
Jimmy Posts: 9 Rating: (0)	Hi, I have a screen with about 80 IO fields on it. When I run the Wincc program, the IO Fields keep on blinking on and off (every second ) indicating that there is no connection. I am connected to the PLC through TCP/IP. The connection was created by the Tag Server automatically. Help is greatly appreciated, thanks. What could the problem be? Regards Jim
Jimmy Posts: 9 Rating: (0)	Last edited by: Jimmy at: 5/30/2006 9:42 PM
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5/30/2006 10:59 PM	Rate (0)
Dec Gold Expert Joined: 5/19/2006 Last visit: 8/5/2023 Posts: 547 Rating: (107)	Hi Jimmy, Can you check with Channel Diagnosis? Dec

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5/30/2006 11:25 PM	Rate (0)
Jimmy Posts: 9 Rating: (0)	I just checked Channel Diagnostics, it shows the connection blinking on and off as well.
Jimmy Posts: 9 Rating: (0)
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5/31/2006 7:21 AM	Rate (0)
Dec Gold Expert Joined: 5/19/2006 Last visit: 8/5/2023 Posts: 547 Rating: (107)	Next step I will check if all my tags are valide PLC memory areas. If youhave 1 bit/byte tag ona DB (usually at the end of DB)that only exists in the offline project but was never downloaded into the PLC,WinCC will abort the entire DB packettags because of the optimisation(block read). So make sure thatALL tags are valide (Use Monitor/Modify Variablein STEP7) Dec

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5/31/2006 9:54 AM	Rate (0)
Salma Gold Member Joined: 9/27/2005 Last visit: 11/27/2007 Posts: 1398 Rating: (149)	Also check the log files for any errors - C:\Program Files\Siemens\WinCC\Diagnose

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5/31/2006 8:31 PM	Rate (0)
Danielle Posts: 1275 Rating: (123)	I agree with Dec! Check the DB sizes on your PLC, cause WinCC might be accessing a non-declared area of the memory! I think that's most likely the problem. If not, it might show on the diagnose! Best regards! Danielle
Danielle Posts: 1275 Rating: (123)
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