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IEC Timer doesn't work in FB and works in FC. Difference?

Created by: Msorich at: 7/3/2018 4:01 PM (8 Replies)

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7/3/2018 4:01 PM	Rate (0)
Msorich Gold Member Joined: 6/28/2017 Last visit: 12/20/2022 Posts: 661 Rating: (40)	Hello everyone, just have faced with such stuff like: made some code in FC, this code has IEC Timers. Everything was working as it should be. However, owing to issues with retentiveness (see my todays topic) I had to put entire code in FB. I got next issue in FB... IEC Timers had stopped to start. Perhaps someone faced already with such stuff... Msorich
	Last edited by: Msorich at: 7/3/2018 4:02:58 PM
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7/3/2018 4:39 PM	Rate (1)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 9/23/2025 Posts: 16136 Rating: (2516)	FYI, putting a timer in an FC feels strange (back when I first started with S7-1200's, I did it all the time....) because you can call an FC more than once in your project. Having the same timer called multiple times in your project is a problem. Is that what happened? If you have timers, put them in FBs and use instance DBs for the timers. If you have timers in FBs using global DBs, that can be a problem very much like it's a problem with FCs. FBs are typically single purpose reusable pieces of logic. If you need retentive options, set up a separate DB for all the tags used by an OB (you can have multiple cyclic OBs if you like grouping your normal scan logic to a single sub-system). With the optimized DB of tags, you can selectively set the retentive nature. However, if you are not allowed that luxury and have to hide the optimization in an instance DB ("Set in iDB"), that's all good too. Just be aware you have to call the FBs and FCs from an OB for them to run. Have I guessed anywhere close? Msorich Hello everyone, just have faced with such stuff like: made some code in FC, this code has IEC Timers. Everything was working as it should be. However, owing to issues with retentiveness (see my todays topic) I had to put entire code in FB. I got next issue in FB... IEC Timers had stopped to start. Perhaps someone faced already with such stuff... Msorich
	science guy
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This contribution was helpful to 2 thankful Users Msorich Md Gouse

7/3/2018 5:45 PM	Rate (0)
Msorich Gold Member Joined: 6/28/2017 Last visit: 12/20/2022 Posts: 661 Rating: (40)	huggy_d1 huggy_d1 Have I guessed anywhere close? What a visionary? Msorich

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7/4/2018 5:44 AM	Rate (0)
Ashok Naphade Bronze Member Joined: 6/8/2013 Last visit: 6/24/2025 Posts: 159 Rating: (9)	Dear Msorich, i also faced same problem. i found mistake in my code i used IO of IEC Timer, So check you done the same mistake

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This contribution was helpful to 1 thankful Users Msorich

7/4/2018 8:03 AM	Rate (0)
Msorich Gold Member Joined: 6/28/2017 Last visit: 12/20/2022 Posts: 661 Rating: (40)	Ashok Naphade I also faced same problem. i found mistake in my code i used IO of IEC Timer, So check you done the same mistake IO of IEC Timer is... What did you meant? Can't get that. Owing to was used timer this way as shown in attachment? Please give an example also. Msorich Attachment T_block_contact.png (138 Downloads)

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7/4/2018 3:24 PM	Rate (0)
O.Omar Silver Member Joined: 12/9/2016 Last visit: 1/13/2022 Posts: 243 Rating: (129)	You should not use the instance data block of the IEC timer. use a seperate coil to read the output of an IEC timer. like in the attachment. Attachment Unbenannt.PNG (308 Downloads)
	If you find my contribution helpful please RATE it :)) Best regards
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This contribution was helpful to 1 thankful Users Msorich

7/4/2018 5:27 PM	Rate (0)
Msorich Gold Member Joined: 6/28/2017 Last visit: 12/20/2022 Posts: 661 Rating: (40)	OpisOm You should not use the instance data block of the IEC timer. use a seperate coil to read the output of an IEC timer. like in the attachment. Hello OpisOm, I heard about that limitation and it might be one more drawback of programming in TIA. However, I didn't like that and had tried to use, as it shown at the pic attached. It's working flawlessly so far. An issue was at another place. So. if you will, look at this thread. Anyway thanks for your inputting. Msorich Attachment timer_in_FB.png (269 Downloads)

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7/5/2018 6:53 AM	Rate (0)
Hati Platinum Member Joined: 9/21/2012 Last visit: 9/24/2025 Posts: 4715 Rating: (510)	OpisOm You should not use the instance data block of the IEC timer. use a seperate coil to read the output of an IEC timer. like in the attachment. Isn't that why the instance has the .Q, so that you can use it where ever you need? I have never had any issues using it.

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7/5/2018 8:49 AM	Rate (1)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 9/24/2025 Posts: 5121 Rating: (768)	Hati OpisOm You should not use the instance data block of the IEC timer. use a seperate coil to read the output of an IEC timer. like in the attachment. Isn't that why the instance has the .Q, so that you can use it where ever you need? I have never had any issues using it. Yes and no, i.e. as long as you really know what you are doing. This discussion shoud shed some light on the topic.
	Last edited by: jacek d at: 7/5/2018 10:21:26 AM @#dP: Tnx for pointing this out Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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This contribution was helpful to 4 thankful Users #dP crazyCow Msorich 0_Einstein

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