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2 subroutine

Created by: niila at: 6/8/2011 1:32 PM (17 Replies)

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6/8/2011 4:46 PM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/3/2025 Posts: 4522 Rating: (843)	niila i have a flowmeter and cpu 224 it generates for ex. in 1 second 10 pulse(so in 1 hours 3600 pulse 100m3 represents, 0 hours 0 m3) that pulse will be sent as an digital input(in my opinion) then i would like to see its range on operator panel Hello nilla, So your flow meter is sending a pulse and you have to connect it to a digital input. It is preferrable to use high speed inputs to avoid missing some pulses. When your HSC (High Speed Counter) count 3600 pulses, it means that 100 m3 of liguid have been flowed through out the flow meter. Your CPU224 have 6 different HSC. Please see the quick refence to know which inputs you should use with which HSC. SIMATIC S7-200 Quick Reference Card CPU22x For programming the HSC in MicroWin, Please read "High Speed Counter Instructions" in chapter 6 of this manual: S7-200 System Manual Hope this helps.
	Ayman Elotaify
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6/8/2011 5:52 PM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 3/30/2025 Posts: 10239 Rating: (1183)	You already received the ideas how to proceed there. Just for future. Download the S7200 programming tips, there are some examples about HSC and another "things" also. http://support.automation.siemens.com/WW/view/en/1232912 best regards, Hristo Mihalev

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This contribution was helpful to 1 thankful Users Ayman Elotaify

6/14/2011 10:07 AM	Rate (0)
niila Posts: 40 Rating: (0)	hi again everyone i would like to do clear my last question i have a flowmeter and with its pulse or frequency we wanna use in s7-200 to get measure the flow i just need a sample example or code to improve it
niila Posts: 40 Rating: (0)
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6/14/2011 10:40 AM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 3/30/2025 Posts: 10239 Rating: (1183)	Do you use some of our suggestions there? I think all the necessary info you have. Let's build the logic together. What did you did until now? Do you have some errors...in this way. Best regards, Hristo Mihalev

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6/14/2011 10:44 AM	Rate (0)
niila Posts: 40 Rating: (0)	hey umencho which suggestion are you talking about? if you have a idea for that question on your mind pls write to it thanx in advance
niila Posts: 40 Rating: (0)
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6/14/2011 11:32 AM	Rate (0)
KayBee Posts: 241 Rating: (7)	Subroutine in S7 200 is similar to FC in S7 300/400. You can use it in S7 200 like FC in S7 300/400.
KayBee Posts: 241 Rating: (7)
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6/14/2011 11:41 AM	Rate (0)
KayBee Posts: 241 Rating: (7)	niila i have a flowmeter and cpu 224 it generates for ex. in 1 second 10 pulse(so in 1 hours 3600 pulse 100m3 represents, 0 hours 0 m3) that pulse will be sent as an digital input(in my opinion) then i would like to see its range on operator panel 10pulse/1sec=6 pulse/min=360 pulse/hr; 1pulse=100/360 m3 if you counting per min. you can scan only 6 pulse per minute if you don't need too much accuracy. I don't know what exact application in your case. So in that way you don't high frquency counter, you can use normal DI.
KayBee Posts: 241 Rating: (7)
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This contribution was helpful to 1 thankful Users niila

6/14/2011 3:30 PM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/3/2025 Posts: 4522 Rating: (843)	niila hi again everyone i would like to do clear my last question i have a flowmeter and with its pulse or frequency we wanna use in s7-200 to get measure the flow i just need a sample example or code to improve it Hello nilla, If the pulse output frequency is not too high, then you can use normal counter. Thus because, in this case we won't have missed pulses. If the pulse output frequency is high, then you have to use HSC to avoid missing some pulses. You should know how much cubic meter per hour of the liquid represented by one pulse output. i.e.1 pulse = x m3/hr Output of Counter / HSC muliplied by the constant "x" will give usthe actual flow. You should program a bit to reset the counter or S/W gate to reset the HSC in order to reset the displayed value of the flow rate. Hope this helps.
	Ayman Elotaify
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