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Time of motor runnibg

8/8/2012 12:58 PM	Rate (0)
Milosh Gold Member Joined: 8/16/2010 Last visit: 12/18/2025 Posts: 640 Rating: (12)	Not minute...Every hour I check times, but i must to compare times in minutes to know which motor I need to start. I check set value(SP) and process value(PV), If SP<PV I need to turn on motor with min.working time. When SP=PV I need to turn off moto with max. working time. Problem is if I have motors with same working time.

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8/8/2012 6:14 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/15/2026 Posts: 16371 Rating: (2522)	Milosh Not minute...Every hour I check times, but i must to compare times in minutes to know which motor I need to start. I check set value(SP) and process value(PV), If SP<PV I need to turn on motor with min.working time. When SP=PV I need to turn off moto with max. working time. Problem is if I have motors with same working time. Pick the motor with the lowest #, or the first one in your list once they are queued up in order of runtime. Since PLC logic is solved one network at a time, once you find a motor with runtime <= runtime of the rest of the motors, set a bit that a motor has been selected. Then your search routine would stop searching, return the found motor, and all would be good in the runtime selection world.
	science guy
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8/8/2012 8:07 PM	Rate (0)
Milosh Gold Member Joined: 8/16/2010 Last visit: 12/18/2025 Posts: 640 Rating: (12)	huggy_d1 Pick the motor with the lowest #, or the first one in your list once they are queued up in order of runtime. Since PLC logic is solved one network at a time, once you find a motor with runtime <= runtime of the rest of the motors, set a bit that a motor has been selected. Then your search routine would stop searching, return the found motor, and all would be good in the runtime selection world. Sorry, but I dont understand what you try to say. First I need to check which motors are turned off, and then compare working time of that motors. Can you show example of your logic in LAD...please.
	Last edited by: Milosh at: 8/8/2012 8:09 PM
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8/8/2012 11:57 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/15/2026 Posts: 16371 Rating: (2522)	Milosh huggy_d1 Pick the motor with the lowest #, or the first one in your list once they are queued up in order of runtime. Since PLC logic is solved one network at a time, once you find a motor with runtime <= runtime of the rest of the motors, set a bit that a motor has been selected. Then your search routine would stop searching, return the found motor, and all would be good in the runtime selection world. Sorry, but I dont understand what you try to say. First I need to check which motors are turned off, and then compare working time of that motors. Can you show example of your logic in LAD...please. Attached are some FCs, DB, and plc data type that work together to make it somewhat easy to do. This is by no means optimized or easy to maintain. However, it may be easy to troubleshoot compared to some methods of looping through motor indexes. This is an ideal situation to use SCL If this is what you were looking for, great. If not, perhaps someone else has better ideas. Attachment Motor_RunTime_Equalize.zip (645 Downloads)
	science guy
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