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S7 Graph timer

6/21/2010 1:27 PM	Rate (0)
Hike Posts: 138 Rating: (0)	Dear guys i have an application where i have to check certain condition if it is true for more than 15 sec then i need to go for the next step. In case this condition is true while entering the step and goes false before 15sec it should remain to the same step until the condition is true again and 15sec has expired. This operation is basically same as s7 on delay timer that we have in step 7. But how can i implement it in s7 graph where i think there is a different type of timer. Regards, Hike
Hike Posts: 138 Rating: (0)
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6/21/2010 2:57 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 9/17/2025 Posts: 1561 Rating: (540)	If I have understood your requirements correctly, the following code will do the trick for you. Remember though, you must compile the CFC with the update sampling time option ticked and the block must be in a cyclic OB (not OB1). [code] FUNCTION_BLOCK FB1010 VAR_INPUT IN : BOOL; SAMPLE_T {S7_sampletime := 'true'} : REAL; END_VAR VAR_OUTPUT OUT : BOOL := FALSE; END_VAR VAR CountVal : REAL := 0.0; END_VAR BEGIN IF IN = TRUE THEN IF CountVal < 15 THEN CountVal := CountVal + SAMPLE_T; ELSE OUT := TRUE; END_IF; ELSE CountVal := 0; OUT := FALSE; END_IF; END_FUNCTION_BLOCK [/code] Hope this meets your needs.
	Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
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6/21/2010 4:02 PM	Rate (0)
Hike Posts: 138 Rating: (0)	Dear i asked it in s7 graph not in SCl
Hike Posts: 138 Rating: (0)
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6/21/2010 4:05 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 9/17/2025 Posts: 1561 Rating: (540)	Sorry Hike, I assumed SCL . I am no expert in graph, so over to someone else.
	Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
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6/21/2010 4:08 PM	Rate (0)
AMAZINGAHMED Gold Member Joined: 8/27/2006 Last visit: 10/22/2024 Posts: 719 Rating: (88)	Is this what you mean?? (see attachement) Attachment CPU 315-2 D.pdf (477 Downloads)
	The more you know, The more you know that you don't know
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6/21/2010 4:34 PM	Rate (0)
AMAZINGAHMED Gold Member Joined: 8/27/2006 Last visit: 10/22/2024 Posts: 719 Rating: (88)	Sorry, this version (see attachement) is working better. I hope this helps. Attachment CPU 315-2 D R1.pdf (600 Downloads)
	The more you know, The more you know that you don't know
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