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Encoder Data Compare at Machine High Speed

Created by: MS1981 at: 10/20/2011 3:28 PM (3 Replies)

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10/20/2011 3:28 PM	Rate (0)
MS1981 Silver Member Joined: 4/14/2010 Last visit: 8/6/2024 Posts: 525 Rating: (11)	Greeting, Can you please help us we have develop the logic for FRABA encoder in PLC but when machine goes on high speed there are some missing occur in Compare Command the output bit is not set due to reason of high speed see attached FC10 bits M80.1,M80.2>>>> Is this scanning time problem or something wrong with logic please advise..???? Thanks Regarded Attachment 1.jpg (114 Downloads)
	MS
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10/20/2011 4:02 PM	Rate (1)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715)	Hello, Don't know your application, in case off high speed i use in a few applications a "window" to not miss the moment position is reached. See attached fc to explain a bit more. Hope that works for your application. Regards, Marcjan Attachment FC8.pdf (147 Downloads)
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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10/20/2011 5:38 PM	Rate (0)
Marciano Bronze Member Joined: 4/30/2007 Last visit: 3/9/2023 Posts: 231 Rating: (23)	Yes it can be the scan time, and it is easy to calculate, let say you have a 1 KHz input pulse and the CPU scan time is 50ms, you would be able to see only increments of 50. For high speed counting maybe you should consider using a FM350 module. I hope this helps Marciano

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10/25/2011 9:45 AM	Rate (0)
MS1981 Silver Member Joined: 4/14/2010 Last visit: 8/6/2024 Posts: 525 Rating: (11)	Thanks for reply Problem is that when machine goes on high speed the CPU not responding for Scaning to proccess the encoder data on Machine high speed because the encoder data (PIW) compared 25 time in a block (OB35) thats why some missing occure in high speed we have configure the exucution time 10ms in OB35 cyclic intrrupt tab but problem is still.. Thanks, Regarded.
	MS
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