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is it possible to use two fast counters from one input?

Created by: MaciejP at: 8/16/2012 7:54 AM (7 Replies)

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8/16/2012 7:54 AM	Rate (0)
MaciejP Posts: 8 Rating: (0)	Is it possible to use two fast counters from one input? So that one can be used for moving to one side and other counter to second side? Or it is needed to connect only one fast input with one counter to have fast counter? To put in another way: are fast counters binded to input or also to logic in PLC so only three can be used? I'm using 0BA7.
MaciejP Posts: 8 Rating: (0)	Last edited by: MaciejP at: 8/16/2012 7:54 AM
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8/16/2012 12:54 PM	Rate (0)
Toeternietoe Platinum Member Joined: 12/27/2006 Last visit: 11/17/2025 Posts: 1200 Rating: (116)	Yes. You can use many counters on 1 input. On the LOGO! 0BA6 about 100, ore even more

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This contribution was helpful to 1 thankful Users MaciejP

8/16/2012 1:04 PM	Rate (0)
MaciejP Posts: 8 Rating: (0)	Toeternietoe Yes. You can use many counters on 1 input. On the LOGO! 0BA6 about 100, ore even more I know that I can use, but my question is: every counter connected to one fast input will be counted with max 5khz no matter how many of them will be connected? Or maybe only first one can be fast counter and rest will be slow counters (counted by logic)?
MaciejP Posts: 8 Rating: (0)	Last edited by: MaciejP at: 8/16/2012 1:04 PM
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8/16/2012 4:02 PM	Rate (1)
Toeternietoe Platinum Member Joined: 12/27/2006 Last visit: 11/17/2025 Posts: 1200 Rating: (116)	Yes, every counter connected to a fast input kan count fast ( max. 5 kHz)

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This contribution was helpful to 1 thankful Users MaciejP

8/16/2012 4:22 PM	Rate (0)
MaciejP Posts: 8 Rating: (0)	GREAT! Thanks for Your answer. This means I can control this big (8 meters) three axis saw for granite using encoders with Logo! Thanks again!
MaciejP Posts: 8 Rating: (0)
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8/16/2012 8:49 PM	Rate (0)
Toeternietoe Platinum Member Joined: 12/27/2006 Last visit: 11/17/2025 Posts: 1200 Rating: (116)	Note that de Low Voltage LOGO! serie 0BA6 has 4 high speed inputs. Ist enough for counting 3 axis.

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8/17/2012 1:06 PM	Rate (0)
MaciejP Posts: 8 Rating: (0)	I'm using 0BA7 24V and it also has 4 fast inputs. I'm using three of them, one for every axis.
MaciejP Posts: 8 Rating: (0)
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8/27/2012 8:44 PM	Rate (0)
Betel Posts: 1690 Rating: (584)	Hi MaciejP, please remember the following facts about the high speed puls inputs: a) The "cnt" pin of the (or a) counter must be direct connected with an input pin - If not, then the maximum rate is only 0.5 * fz (with fz = LOGO! cyclic frequency) b) The output pin to the counter gets only new states at one time every LOGO!- cycle c) A pointer to the counter actual value (inside an analog block) gets only a new value at one time every LOGO!- cycle That means, that the using of high speed input pulses is verry difficult and for the most applications not good usable - because the LOGO!-cycle frequency is to low, sorry! Best regards Betel
Betel Posts: 1690 Rating: (584)
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