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"SIMATIC Timers" versus "IEC Timers"

Created by: hdhosseini at: 7/7/2013 10:19 AM (31 Replies)

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7/7/2013 10:19 AM	Rate (3)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/24/2025 Posts: 6885 Rating: (1368)	Hello friends, I suggest talking about cases we have encountered in practice and even in forum.I think in some issues we need to discuss."SIMATIC Timers" or "IEC Timers".What do you think about Limitation we have in SIMATIC Timer (e.g number) Easy in programming Difficulty for data type handling for each cases and limitations for "SIMATIC Timer Data Type" (desmul24) Execution Load on CPU in case of using several number of each cases Memory consideration for IEC Timer when number increases What characteristics of SIMATIC Timers are missed by IEC Timers "William B." Inadvertent CPU stopping because of invalid Hex time value for SIMATIC timers from HMI Difference Dynamic behavior of IEC and SIMATIC Timers (IBN-Service) Working on your own timer in case of new features required and not included in both IEC and SIMATIC Timers (AMAZINGAHMED and viralpatel ) Please, feel free to expand the list and write what you think based on your experience.All feedbacks are welcome.List will be updated by me or by your suggestions. Thank in advance Hamid Hosseini
	Last edited by: hdhosseini at: 7/16/2013 12:34 AM 5) case in row #6 changed from "Limit range of type selection in IEC Timers" to "What charateristics of SIMATIC Timers are missed by IEC Timers" due to suggestion from "William B." Last edited by: hdhosseini at: 7/16/2013 12:25 AM 4) Topic in row #3 modified due to impressive work of "desmul24" Last edited by: hdhosseini at: 7/10/2013 4:22 PM 3) Thanks to "AMAZINGAHMED "and "viralpatel", new issue about "Writing Your Own Timers "added Last edited by: hdhosseini at: 7/8/2013 2:03 PM 2) Make REVISIONS to transfer the question to the "STEP 7/ STEP 7 Lite" conference Last edited by: hdhosseini at: 7/7/2013 6:39 PM 1) add first suggestion from IBN Service for dynamic behavior of both timers. Last edited by: hdhosseini at: 7/7/2013 10:56 AM Last edited by: hdhosseini at: 7/7/2013 10:48 AM Last edited by: hdhosseini at: 7/7/2013 10:24 AM Demo Channel on Youtube
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This contribution was helpful to 7 thankful Users SolutionFinder Lucky123 crazyCow desmul24 metwally mustafa VVago Barekati

7/7/2013 11:07 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	puh, this little yellow minions make me addicted.... Attachment E:\Logo_Minions.jpg (1213 Downloads)
IBN-Service Posts: 8946 Rating: (1000)	Last edited by: IBN-Service at: 7/8/2013 7:12 PM
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7/7/2013 11:17 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/24/2025 Posts: 6885 Rating: (1368)	Beside those "little yellow minions" , I am sure, we can get result of this discussion here.
	Last edited by: hdhosseini at: 7/8/2013 8:49 PM Demo Channel on Youtube
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7/7/2013 11:23 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	OK. IEC Timers "waste" a datablock. If you need a lot, you must organize them in a multiinstance call. That IEC Timer needs memory is OK, but why we stillhave todeclare a datablock???
IBN-Service Posts: 8946 Rating: (1000)
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7/7/2013 11:26 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	Anoher thing that I dont like when using IEC Timer: If I set reference time to 0, the timer will NOT start. But a S5-Time will start without problem. What I like at IEC Timer: The reference Time is formated as "Time" in ms, so it is very easy to calculate the time and display the value at HMI.
IBN-Service Posts: 8946 Rating: (1000)
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7/7/2013 11:28 AM	Rate (1)
IBN-Service Posts: 8946 Rating: (1000)	Every time I need a Timer in a FB, I will always use IEC-Time, called as multiinstance. But I take care, that I compare the setpoint (un)equal to zero in my code. Mostly, if setpoint parameter is "Time = 0ms" I will disable the timerfunction in my function block.
IBN-Service Posts: 8946 Rating: (1000)
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7/7/2013 6:52 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/24/2025 Posts: 6885 Rating: (1368)	Hello again, I just re-phrase again the points mentioned by Jürgen : If there is limitation of number of SIMATIC Timers, Time to use IEC timers.They cost memory.The can be called with ordinary call of an FB and DB or in a more Multi-instance reusable structure. For re-starting an IEC Timer, it is not possible to make the set point (Pre set Time) zero.This is common problem. and I just add a memory in parallel of input to make the re-start possible HERE. Comparing "PT" in logic for being "zero" is necessary to gurantee troube free operation. The output of IEC timers are in data type "TIME" and easy to process. The missing point is "I tried to restart a SIMATIC On delay timer by making the time value zero", But no success.What type of SIMATIC timer you have tested for re-start? Best regards Hamid Hosseini
	Last edited by: hdhosseini at: 7/18/2013 9:49 PM Demo Channel on Youtube
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7/9/2013 10:30 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/24/2025 Posts: 6885 Rating: (1368)	Hello friends, This is not an ordinary question.It is a discussion coming from Expert conference for new idea here.Please, only check the topics selected in the first post and write about that.Please do not write OFF-Topic.I will check all suggestions, provide feedback to moderators and also may add your experience as it valuable in 1st post.You can suggest new topics if you think, really relevant. Best regards Hamid Hosseini
	Last edited by: hdhosseini at: 7/9/2013 10:36 AM Demo Channel on Youtube
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This contribution was helpful to 3 thankful Users MRG Lucky123 viralpatel

7/9/2013 11:45 AM	Rate (2)
AMAZINGAHMED Posts: 719 Rating: (88)	When I'm annoyed with the limitation of SIMATIC timers, I use another technique. I use the cyclic OBs (e.g. OB32) and use its timebase to increment word or double word to achieve accurate timing. I don't remember using IEC timer before.
AMAZINGAHMED Posts: 719 Rating: (88)
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7/9/2013 3:21 PM	Rate (2)
viralpatel Posts: 523 Rating: (32)	Hi, I want to add further opinion for above posts, I mostly use CPU Clock memory as a time base then use it as per requirement as it support upto 100ms, and for more accuracy using OB 30-38 series blocks regards, Viral patel
viralpatel Posts: 523 Rating: (32)
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