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Time Delay Interrupt

Created by: Hike at: 8/16/2009 6:23 AM (7 Replies)

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8/16/2009 6:23 AM	Rate (0)
Hike Posts: 138 Rating: (0)	Hey i am having some problem while working with Time delay interrupt. It's working fine when the delay time is around 10ms. However for greater time delay it doesn't work. Plz tell me what is the delay time limitation for it. Also i want to generate square wave of 50% duty cycle of variable frequency. How can i do it. Frequency range from 0Hz to 5KHz max.
Hike Posts: 138 Rating: (0)
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8/16/2009 11:36 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (995)	Waqas Hey i am having some problem while working with Time delay interrupt. It's working fine when the delay time is around 10ms. However for greater time delay it doesn't work. Plz tell me what is the delay time limitation for it. Also i want to generate square wave of 50% duty cycle of variable frequency. How can i do it. Frequency range from 0Hz to 5KHz max. What you are talking about? Which function, which FM? May be, FB43 / SFB43?
IBN-Service Posts: 8946 Rating: (995)
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8/16/2009 2:40 PM	Rate (0)
yy1 Gold Member Joined: 3/24/2009 Last visit: 1/5/2023 Posts: 535 Rating: (110)	Dear Waqas, can you tell us something about your program, especially in which OB you call the SRT_DINT-block and the execution-time of the OB . My idea is, that the SRT-DINT-block is called again, before the time-delay-interrupt starts (a second call to the SFC will restart the time). To prevent this, you can ask the state of the time-delay-interrupt with the SFC34 (QRY_DINT) if there is an active time-delay-request. In this case you shouldn't call the SRT_DINT again. [code] CALL "QRY_DINT" OB_NR :=20 RET_VAL:=MW12 STATUS :=MW20 A M 21.2 JC end1 CALL "SRT_DINT" OB_NR :=20 DTIME :=T#1S SIGN :=W#16#AFFE RET_VAL:=MW10 end1:NOP 0 [/code] Regards, yy1
	Last edited by: yy1 at: 8/17/2009 8:09 AM
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8/17/2009 10:12 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (995)	I am afraid, that even with the advice from yy1 it will not be possible to generate a frequency from 5 kHz!
IBN-Service Posts: 8946 Rating: (995)
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8/17/2009 10:46 AM	Rate (0)
yy1 Gold Member Joined: 3/24/2009 Last visit: 1/5/2023 Posts: 535 Rating: (110)	IBN-Service I am afraid, that even with the advice from yy1 it will not be possible to generate a frequency from 5 kHz! Correct, my answer only refers to the first part of the posting. I also don't think, that it's possible to generate a frequency of 5 kHz.

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8/17/2009 4:50 PM	Rate (0)
Hike Posts: 138 Rating: (0)	Thanks dude. I did it at last although STL is a mystry for me. But the finally able to put it in ladder. And i think with resulution of 1ms only frequencies of 1khz is possible only. Next question is "Is it possible to achieve freq upto 5khz without using function module. I really doubt it. But want experts to confirm it.
Hike Posts: 138 Rating: (0)
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8/17/2009 8:16 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (995)	Waqas ... And i think with resulution of 1ms only frequencies of 1khz is possible only. ... No. 1 ms high + 1ms low = 2ms periodtime = 500 Hz. For higher output frequency, you can use the FB PULSE (SFB 49) together with a C - CPU.
IBN-Service Posts: 8946 Rating: (995)
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11/4/2014 8:50 AM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4812 Rating: (123)	New question published bygiselinha is split to a separate thread with the subject S7-1200 programing time delay interrupt, Cyclic interrup, Hadware interrupt. Best regards Min_Moderator

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