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How to check scan rate of routine?

Created by: MickMars at: 12/24/2010 9:53 AM (1 Replies)

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12/24/2010 9:53 AM	Rate (0)
MickMars Posts: 8 Rating: (0)	Hi All, I'm fairly new to programming and I would like to know the way of checking the scan rate of a routine. Currently I'm doing a conversion from Siemens S5 (115H CPU 942) and facing difficulty with the portion of flow totalizer because I need to get the scan rate value so that I can formulate a formula. Where do I look up the scan rate value? Thanks in advance.
MickMars Posts: 8 Rating: (0)
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12/25/2010 9:13 PM	Rate (0)
jklm Platinum Member Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (309)	Hello, in the Header of each OB (as of byte 12 of the first 20 local data bytes) you can read the time the OB was started. You can also read the system time using SFC1 This is explainde here (http://support.automation.siemens.com/WW/view/en/21222026). If you read the time before each call, you can compute the difference between calls and know the exact rate. In the standrd libary you will find the FC34 SB_DT_DT The function FC34 subtracts two time values (format DT) and provides a duration (format TIME) as the result. Where the Format TIME is a 32 bit interger in msec.
	Best regards jklm Suggestion was helpful? Feel free to rate it.
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