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Change the frequency of a output

Created by: TheMax at: 11/26/2012 9:24 AM (3 Replies)

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11/26/2012 9:24 AM	Rate (0)
TheMax Posts: 15 Rating: (0)	Hi, I would like to know if it's possible to create a signal digital, with a frequency variable between 0 to 500 Hz, and keep the CPU RUN. Regards
TheMax Posts: 15 Rating: (0)
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11/26/2012 3:08 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 10/4/2024 Posts: 15264 Rating: (2422)	TheMax Hi, I would like to know if it's possible to create a signal digital, with a frequency variable between 0 to 500 Hz, and keep the CPU RUN. Regards If you create a 1ms interrupt OB, you can toggle at the500 Hz rate. That is the fastest rate you can achieve. You can set the rate, have the interrupt OB add 1 to a count, compare to frequency tagHz * 2 and if count > Hz * 2, change state, thenreset count - or something like that.
	science guy
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11/26/2012 3:41 PM	Rate (0)
TheMax Posts: 15 Rating: (0)	Thx for this solution but I have a problem With my signal I have T_on = T_off - 500Hz 1 ms T_on + 1 ms T_off - 250 Hz 2 ms T_on + 2 ms T_off but I can't create a signal with a frequency between 499 to 251 Hz
TheMax Posts: 15 Rating: (0)
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11/26/2012 4:14 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 10/4/2024 Posts: 15264 Rating: (2422)	TheMax Thx for this solution but I have a problem With my signal I have T_on = T_off - 500Hz 1 ms T_on + 1 ms T_off - 250 Hz 2 ms T_on + 2 ms T_off but I can't create a signal with a frequency between 499 to 251 Hz You can try the PTO pulse train output and control a fake axis. It appears it will create the pulse train with a simple axis enable, and axis set velocity command and can use a tag to adjust velocity. It may take a little adjusting and tuning to set the rate limits and commission, but it should allow much finer control over the output pulses. If you get this working the way you like, perhaps you will post screen shots of the configuration, and block setup so others can benefit?
	science guy
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