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Using Timer in some FBs to make delay

Created by: saleh at: 10/18/2014 8:42 AM (7 Replies)

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10/18/2014 8:42 AM	Rate (0)
saleh Posts: 124 Rating: (4)	I have three FBs with parallel connection in main OB (attached in below), and they must control three Fans (Motors), I want to delay between these. for example when Fan1 started, then Fan2 is starting after 30 seconds and then Fan3 will start after 60 seconds. can I use Ton Timer? Attachment img.jpg (90 Downloads)
saleh Posts: 124 Rating: (4)
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10/18/2014 8:56 AM	Rate (0)
Kahl Platinum Member Joined: 12/16/2012 Last visit: 2/1/2023 Posts: 634 Rating: (123)	Hi You can use TON for delaying your 2nd and 3rd fan. You can use the output of the first FB ("Fan1 ") to start a TON and use the output (.Q) of the TON in front of the second DB, and so on ...
	ALPHR Technology Europe
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10/18/2014 9:25 AM	Rate (0)
saleh Posts: 124 Rating: (4)	Kahl Hi You can use TON for delaying your 2nd and 3rd fan. You can use the output of the first FB ("Fan1 ") to start a TON and use the output (.Q) of the TON in front of the second DB, and so on ... this is not good, because every Fan must independent and started automatically.
saleh Posts: 124 Rating: (4)
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10/18/2014 9:34 AM	Rate (0)
Kahl Platinum Member Joined: 12/16/2012 Last visit: 2/1/2023 Posts: 634 Rating: (123)	Sorry! In this case your description was not very clear to me. Try to give more details about the functioning.
	ALPHR Technology Europe
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10/18/2014 3:04 PM	Rate (0)
William_B Posts: 5225 Rating: (1160)	saleh I have three FBs with parallel connection in main OB (attached in below), and they must control three Fans (Motors), I want to delay between these. for example when Fan1 started, then Fan2 is starting after 30 seconds and then Fan3 will start after 60 seconds. can I use Ton Timer? Hi there. From your picture and conversation, I am going to make some asumptions. If not correct.. please try again to explain your idea. My best guess what you want.. You are wishing to create a generical FB that can be used for any of the fans. The control system should however include some concept that allows the physical switch on from one fan to the next to be delayed. I see two options.. 1. a timing source external to the generic FB 2. a timing source internal to the generic FB 1. EXTERNAL (variations does exist) -------------------------------------------------------- The signal that triggers an ON state triggers a TON timer with the limit exceeding the longest delay. You can feedback the running time of the timer (example: "GlobalDB".TIMER1.ET) back into the FB. I think that is what you had in mind originally with "currentT"?. Also as an input parameter to the FB you give the value to compare to. The compare value will be.. Fan 1 >> 0ms Fan 2 >> 30sec Fan 3 >> 60sec 2. INTERNAL (variations does exist) -------------------------------------------------------- Include inside the generic FB a single delay timer (TON). The TON is linked to the running of the fan. In turn the output of this timer feeds back to a bit output parameter of the FB (#delay_out). Also create an extra #permition_to_run input signal for the FB. This permition is needed to start the fan. The control for Fan 1 gets the original "fan can start" onto the #permition_to_run. Fan 2 receives DB7.delay_output onto its own #permition_to_run. Fan 3 is as Fan 2 with DB8.delay_output feeding into on #permition_to_run. LATE NOTE: Do not use EN to start/stop the fan. If EN = FALSE then the coding inside the FB has no control over the fan. The fan will remain in the switched ON state. I hope it is helpful to push the topic along. Greetings. w
William_B Posts: 5225 Rating: (1160)
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10/18/2014 7:25 PM	Rate (0)
saleh Posts: 124 Rating: (4)	Thank you william, it's work. i used External source to delay FBs. but one question remain, when EN is false? do you mean power fail? what do should i do?
saleh Posts: 124 Rating: (4)
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10/19/2014 6:41 AM	Rate (0)
William_B Posts: 5225 Rating: (1160)	saleh Thank you william, it's work. i used External source to delay FBs. but one question remain, when EN is false? do you mean power fail? what do should i do? Thank you for the feedback. From the image in your original post - it is not clear what is giving the EN "power". If it is directly connected to the "power" line on the left - then you are okay. However.. when you have a condition between "power" and your EN >> trouble. Let us take this example.. [code]if #EN then #Fan := #Switch; end_if;[/code] #EN represents all the conditions that you put in front of the FB. Only if #EN is true will the #Fan be switched OFF/ON by #Switch. If #EN would go false then the state #Fan will not be able to change anymore. I hope this helps. w
William_B Posts: 5225 Rating: (1160)
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10/19/2014 2:19 PM	Rate (0)
saleh Posts: 124 Rating: (4)	Thank you for complete answer. I used condition in front of FBs and this condition connected to power line. when one Fan is started in one FB, that will be stopped in same FB. so each fan should work correctly. nevertheless you have experience and expert, i must change my plan. sincerely!
saleh Posts: 124 Rating: (4)
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This contribution was helpful to 1 thankful Users William_B

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