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schedule a daily program from HMI

Created by: miltos at: 12/15/2010 10:33 AM (4 Replies)

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12/15/2010 10:33 AM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	Hi. I am beginner with step7 basic. I am trying to schedule a daily program from HMI. I want the user to be able to set in HMI the start and stop time for a pump operation. I imagine that i can be done like this: In 4 I/O fields the user sets, for example: Start_1: 08:00 Stop_1: 13:00 Start_2: 18:15 Stop_2: 21:15 if he wants the pump to run every day, from 08:00 to 13:00 and from 18:15 to 21:15. I am not able to configure the I/O fields for the start and stop times. If i get over this, i thing it will be easy to program the plc switching the output, using DTL. Can anybody give an advice? Splitted from Scheduling time clock.
	Last edited by: O_Moderator at: 12/16/2010 11:30 AM new subject after splitting Last edited by: miltos at: 12/15/2010 10:34 AM
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12/16/2010 7:26 AM	Rate (0)
4x4 Posts: 4 Rating: (0)	Hi, I have S71214 CPU and KTP600PN. I have done 4 channel weekly timer in it. I have hmi screen where i can change these four channel (start/stop) times. I use plc system clock and i have also synchronize hmi time to plc time. Everything is working very well. See attached file. I hope you get some ideas from it... Attachment Weekly timer hmi screen.jpg (876 Downloads)
4x4 Posts: 4 Rating: (0)
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12/16/2010 11:07 AM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	Thanks for the reply. If i understand well, you can only set the time for start stop in format: 8, 13 ect. I would like something like 8:00, 18:15 ect. I think i can implement something like this. In another project, using other plc, i did something like this: In plc, i could read local time in bcd format. For example, if time was 18:15, i had a MW equal to 1815. In HMI i had programmed I/O fields, where i could set on-off times without ":". If i wanted the pump to start at 14:20, i had to set 1420. After this, with a compare instruction, i could set the output on or off. I would like something more elegant than setting time in HMI in this format.
	Last edited by: miltos at: 12/16/2010 11:12 AM
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12/17/2010 5:41 AM	Rate (0)
4x4 Posts: 4 Rating: (0)	I have only needed "hour" i/o-fields in my projects. But it is very easy to use also "minute" and"second" -fields if yuo need that. See attached file. There is only used "hour" values, but you can easily do "minute" ans "second" values too in same way... Attachment Weekly timer plc code.jpg (937 Downloads)
4x4 Posts: 4 Rating: (0)
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12/17/2010 9:52 AM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	I agree with you. It is easy to program minute fields. But it is not the best for the user. My project is a building application. Also, this way, it is a little bit problem to handle daily programs with recipes.

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