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Running Time Calculation of Motor in plc from display on HMI

Created by: KVS at: 6/4/2014 12:49 PM (16 Replies)

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6/4/2014 12:49 PM	Rate (0)
KVS Regular Member Joined: 5/11/2013 Last visit: 10/12/2024 Posts: 31 Rating: (0)	I Have to make a time accumulator to store running ours of spindle motor. I tried to do it with a TP timer but not get success. PT is set to 12Hrs, as the spindle max continuous running hours is 8hrs. ET is in millisecond, saved in a DInt type variable. then added to other DInt type variable and stored in same variable. In this either value remains 0 or goes to 1623245. Not Getting correct time. PLC is S7-1200 1214C PLC. HMI is KTP 600 BAsic PN.

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6/4/2014 1:01 PM	Rate (0)
William_B Posts: 5225 Rating: (1194)	KVS I Have to make a time accumulator to store running ours of spindle motor. I tried to do it with a TP timer but not get success. PT is set to 12Hrs, as the spindle max continuous running hours is 8hrs. ET is in millisecond, saved in a DInt type variable. then added to other DInt type variable and stored in same variable. In this either value remains 0 or goes to 1623245. Not Getting correct time. PLC is S7-1200 1214C PLC. HMI is KTP 600 BAsic PN. Hi. Maybe look at the RTM command. Otherwise consider using a retentive timer (TONR) with a limit like 1hour. When the timer expires you can add to a retentive DINT variable. This is the short-and-sweet version. If you need more.. please ask. Greetings. w
William_B Posts: 5225 Rating: (1194)	Last edited by: William B. at: 6/4/2014 1:08 PM RTM link: /tf/WW/en/Posts/107268 Coded link: /tf/WW/en/Posts/104017
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6/4/2014 5:21 PM	Rate (0)
KVS Regular Member Joined: 5/11/2013 Last visit: 10/12/2024 Posts: 31 Rating: (0)	In Normal running spindle motor runns for a max 30minuites. I was TONR block. but not able to get correct value. I'm not clear about TONR application. kindly help.

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6/4/2014 8:09 PM	Rate (0)
William_B Posts: 5225 Rating: (1194)	KVS In Normal running spindle motor runns for a max 30minuites. I was TONR block. but not able to get correct value. I'm not clear about TONR application. kindly help. Hi. See the TONR block as a time counter. The counter runs while the "IN" has a true value. The time counter keeps its value if "IN" goes false. To make the time counter zero, the "R" needs to receive a true signal. "PT" is the preset time. It is the TIME data type. It is written in the format (example from TIA help) T#10d20h30m20s630ms. Beware: The counter will not go higher than this value! "ET" is the elampsed time. You can also read it in DB format <TimerDB>.ET. The "ET" value will not go higher than "PT". If this time counter reaches its preset value: "ET" >= "PT" Then the "Q" will go true. This can also be read as the boolean <TimerDB>.Q --- If you have "PT" set to T#1M; the "Q" can trigger a variable (DINT) to count the minutes. Please show us in code what you have in mind. This way we can direct you better in what you can do further. C-ya. w
William_B Posts: 5225 Rating: (1194)
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6/5/2014 11:41 AM	Rate (0)
KVS Regular Member Joined: 5/11/2013 Last visit: 10/12/2024 Posts: 31 Rating: (0)	Please find attached screen shot. MD1402 & MD1406 is dint type variable for calculation. totaltime is DInt type variable of DB time_cal. PT is 1 Day. ET is in millisecond and MD1402 is divided by 3600000 for conversion in hour. Attachment hour meter.JPG (2723 Downloads)

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6/5/2014 11:38 PM	Rate (1)
William_B Posts: 5225 Rating: (1194)	KVS Please find attached screen shot. MD1402 & MD1406 is dint type variable for calculation. totaltime is DInt type variable of DB time_cal. PT is 1 Day. ET is in millisecond and MD1402 is divided by 3600000 for conversion in hour. Hi. Thank you for sharing the code segment. Note.. MD1402 is actually TIME data type but you can use DINT as you did. The problem is that you take the DINT result and divide it with another DINT. The result would want to be a DINT value. MD1402 never will go over T#1D. Dividing with 3600,000 (ms) will result in a hour number without a decimal. If you are okay with that, then it is all good. Careful.. MD1402 (Tag_25) overlaps with M1402.0 (Tag_29). Changes is either number or bit contaminate the other. I also do not understand why you are adding Tag_28 to get totaltime. Tag_25 is already totaltime.. for as long as the timer is running. The timer is running if it is not reset by Tag_29 and Tag_25 does not reach 1DAY time. Maybe if you reach 1DAY or Tag_29 goes true, you may want to record Tag_25 with an add function. Please see if you understand what I try to tell you above. Go ahead and redesign your code with the general idea you have. There is nothing wrong with your idea.. it just needs work. I am not sarcastic when saying that. I would like to see you publish YOUR code idea again. [PLEASE] ----------- Attached I am giving you a piece of code. Look at it in detail. There is a lot of little secrets hidden in it. Notice that the timer does not loose its value when IN goes false. The timer does not loose its value when power goes off. The timer goes to zero when the timer's reset (R) is triggered. Look at it and come back with detail questions if you have any. PS: On which PLCs have you worked on previously? I have experience in several brands; it will give me (us) something to compare with for explanations. Good luck. w Attachment Ladder code segment_TONR demo for running time measure.jpg (2386 Downloads)
William_B Posts: 5225 Rating: (1194)
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6/6/2014 8:26 AM	Rate (0)
KVS Regular Member Joined: 5/11/2013 Last visit: 10/12/2024 Posts: 31 Rating: (0)	Thanks for the code. I too like to design my own codes just need help. I'll check for MD1402 & M1402.0. I keept all tags in DInt type because on KTP600 Basic HMI Time data type is displayed in Dint type and when i change the I/O field for Time it shows error in Tag field and I/O field display changed to HH:MM:SS AM/PM. I divided the MD1402 by 3600000 for keep it in hours. TONR is reseted when spindle motor reches zero speed to get time of a certain run, it may varry from 2sec to 2hrs. MD1406 is added to totaltime to get accumulated value. I'll try it again.

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6/6/2014 10:08 AM	Rate (0)
William_B Posts: 5225 Rating: (1194)	KVS Thanks for the code. I too like to design my own codes just need help. I'll check for MD1402 & M1402.0. I keept all tags in DInt type because on KTP600 Basic HMI Time data type is displayed in Dint type and when i change the I/O field for Time it shows error in Tag field and I/O field display changed to HH:MM:SS AM/PM. I divided the MD1402 by 3600000 for keep it in hours. TONR is reseted when spindle motor reches zero speed to get time of a certain run, it may varry from 2sec to 2hrs. MD1406 is added to totaltime to get accumulated value. I'll try it again. Hi. The TONR has the function of "totaltime" already. I suggest to trigger the add to "totaltime" before you reset the TONR. If you only wish to measure the continious run time, you can use a TON. Then you can add MD1406 to "totaltime" at the moment the spindle switch off (edge trigger). The add function should be before the TON. Helpful? w
William_B Posts: 5225 Rating: (1194)
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6/6/2014 11:33 AM	Rate (0)
KVS Regular Member Joined: 5/11/2013 Last visit: 10/12/2024 Posts: 31 Rating: (0)	Hi this is something interesting. add befor reseting. let me try. Thanks

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6/8/2014 8:31 PM	Rate (0)
William_B Posts: 5225 Rating: (1194)	KVS Hi this is something interesting. add befor reseting. let me try. Thanks Any update?
William_B Posts: 5225 Rating: (1194)
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