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Comparitor

Created by: alanled100 at: 7/13/2018 7:12 AM (6 Replies)

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7/13/2018 7:12 AM	Rate (0)
alanled100 Posts: 28 Rating: (2)	Hi, this is my first time using a Logo. Is there a way I can read an Up down counter current count value and compare it with a fixed value to operate a bit., similar to the way a Comparitor function does it in TIA. I want to control a simple ladder step sequencer based on count value. So depending what the current count value was this would determine what ladder step to run Thanks.
alanled100 Posts: 28 Rating: (2)
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7/13/2018 7:36 AM	Rate (1)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/11/2023 Posts: 31595 Rating: (3928)	The possibility exists. However, she is not quite as easy as in TIA. The LOGO! can compare analog values only as an integer, since the LOGO! only for fixed-point numbers (16 bits, -32768 to 32767). The counter value of a counter is however is a DInt (32 bit) and can be max. reach a value of 999,999. If the counter value does not exceed 32,767, it can be easily compared using an analogue comparator. Please tell us, how is the maximum of the Counter value.

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This contribution was helpful to 1 thankful Users RKBIS

7/13/2018 7:38 AM	Rate (0)
alanled100 Posts: 28 Rating: (2)	Thanks for your replay, there are only six steps in the sequence
alanled100 Posts: 28 Rating: (2)
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7/13/2018 7:52 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/11/2023 Posts: 31595 Rating: (3928)	Do the six values go from 0 to 5 or from 1 to 6?

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7/13/2018 7:59 AM	Rate (1)
Helmut_13 Posts: 2930 Rating: (432)	Hi, you can use one UP/DPWN counter for each compare, or for sequence control the shift register. Hope this helps
Helmut_13 Posts: 2930 Rating: (432)
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This contribution was helpful to 1 thankful Users RKBIS

7/13/2018 8:16 AM	Rate (1)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/11/2023 Posts: 31595 Rating: (3928)	Here's an example of how to compare 6 values with a counter. There are other options as well. If you knew what exactly you want to do, you could help you more purposefully. Attachment Compare.zip (50 Downloads)

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7/13/2018 10:03 PM	Rate (0)
alanled100 Posts: 28 Rating: (2)	Many thanks Guys, I managed a work around.
alanled100 Posts: 28 Rating: (2)
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