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PLC Timer Programming for Beginners
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- čas přidán 16. 08. 2024
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⌚Timestamps:
00:00 - Intro
00:40 - Types of PLC timers
00:49 - PLC timer values
02:30 - PLC timer examples
02:53 - On-delay timer
05:24 - Off-delay timer
07:15 - Retentive on-delay timer
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In this video, we will be talking about PLC timers. We will explain what PLC timers are, how they work, the different types of timers, and give some examples of how they are used.
PLC timers are internal PLC instructions that can be used to delay input and output signals in the PLC program.
These timers operate like relay timers but you cannot hold a PLC timer in your hand and they do not need to be connected to wires to operate.
There are three main types of PLC timers:
- the on-delay timer,
- the off-delay timer,
- the retentive on-delay timer.
All of these PLC timers have a timer file name, a preset value, an accumulated value, a timer enabled bit, a timer timing bit, and a timer done bit.
- The timer file name is a PLC tag. This tag is where you can find the timer’s preset and accumulated values and the timer enabled, timing, and done bits.
Some PLCs create the timer file name for you and other PLCs have you create the timer file name.
For all of my timer examples, I will use the timer file name Timer1. I will also use a selector switch to enable and disable the timers.
- The timer preset value is the number that shows the delay length of the timer. This number can be changed by just typing it in or you can have the PLC write a number into this value. This number does not change during the timer’s normal operation.
- The timer accumulated value is the number that shows how long the timer has been timing. The timer accumulated value does not function the same on all of these timers.
- The timer enabled bit will be on when the timer is enabled.
- The timer timing bit will be on when the timer is timing.
- The timer done bit does not function the same on all of these timers.
I will be using Studio 5000, which is the PLC programming software for Allen-Bradley ControlLogix PLCs.
But the things you will learn here in these examples can be applied to any other PLC software. Because the overall timer functions are pretty much the same for any other PLC brand.
Let’s start by placing a new on-delay timer instruction on a PLC rung with a selector switch input.
Type the timer file name Timer1.
Next, enter the timer preset so that it equals ten seconds.
Not all PLC timers use the same time base, some have time bases that cannot be changed while others will give you multiple time base options.
I will discuss what happens to the PLC on-delay timer, off-delay timer, and retentive on-delay timer when the selector switch gets turned on and off.
Setting up an off-delay timer is the same as an on-delay timer.
Retentive on-delay timers are a lot like on-delay timers. The only major difference with retentive on-delay timers is how the timer accumulated value acts when you turn the selector switch on and off and that it needs a reset bit.
Timer applications:
1) On-delay timer
On-delay timers are used a lot in PLC programs and in many different ways. For example, an on-delay timer can be used on a conveyor’s start button.
The timer could be set up so that the start button would need to be pushed and held for five seconds before the conveyor would start.
Another on-delay timer could also be set up to sound a conveyor start-up warning horn and light.
2) Off-delay timer
Off-delay timers are used when you need something to stay running longer than everything else. For example, cooling fans and pumps might continue to run after a machine pauses from doing work.
3) Retentive on-delay timer
Retentive on-delay timers can be used to track the runtime of equipment.
They can be set up to trigger an indicator light to let someone know the equipment has run long enough and requires maintenance to inspect and clean it.
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I seriously can’t thank you enough for this video, I’ve really been struggling to understand the timers and counters and your videos break them down so freaking well!!
You're very welcome! That's great to hear, if anything is unclear, please do not hesitate to contact us at any time.
Best tutorial for such a simple function. By the way, if you have a video for every ladder logic function, there's no need to lose time with courses, you're explaining way better.
Great suggestion! Thanks for your kind support and feedback!
Thank you RealPars team!
Please consider making videos explaining automation in electrical substations.
Hi Hamza!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
One good simple example of using retentive timer would be automatic lubrication interval for ie. conveyor that starts and stops frequently. I used retentive timer just while ago to accomplish even lubrication times based on actual conveyor runtime. This wouldn't work with timer on/off functions, because counting would likely reset at wrong times resulting possibly in no lubrication at all.
Thanks realpar for choosing separate topic of timers thanks a lot,,
You are most welcome, Kiran!
I did a paid internship in which they taught us using RX logix 500 to manipulate timer and delays.
Awesome video, more example about three types of timer so that we can understand fully the function of timers
Glad to hear that, Amin! I will go ahead and pass that on to our course developers, thanks for your feedback!
Great.
To build an open & close gate automation with pushbutton.
Kindly advise the ladder diagram for limits timers.
Hey sir Anish here a beginner in automation field...big thank for your helpful videos....keep making videos in Allen Bradley plc software.
Thanks for your support, Anish!
Great video. Clear and understandable explanation with a good applications.
Much appreciated
Glad you enjoyed it!
Wow this looks so easy thanks
Glad to hear that, Roberto!
sir ,lot of thanks for concept of plc timer programing.
You are most welcome!
Thank you so much. Please do more of these videos to help us. I'm taking plc classes and I realized that the teacher is not giving more details. Please Please post and post
I WOULD LIKE TO KNOW HOW TO CREATE TAGS
Thanks for your feedback! I will happily go ahead and pass this on to our course developers. Happy learning!
sir ,lot of thanks for conceot of plc timer programing.
You are most welcome!
Thank you ,i have aquestion .what if the switch is turned off before the end of preset time is the retentive timer accumulate go to zero
No, the accumulated time will remain at its last value. If the switch is turned back on, the timer simply starts where it left off.
Sir, can you explain timer with other instructions with example so we can understand how can I used timer in different application.
Thanks for the feedback, Yuvraj! I will happily pass this on to our course developers.
Hi RealPars - great channel! A request, how about motor and feeder protection relays and differential protection relays explained?
Thanks a lot, Matthew!
Great topic suggestion, I will happily pass this on to our course developers.
Thanks again and happy learning!
Thanks Realpars!!!
You're very welcome, Wilberth
Best tutorial ever!
Thank you very much!
Well explanation❤❤❤❤❤
Thank you!
Can you add more examples so that everybody understand well
Hi Shaik,
Thanks for your comment and feedback!
I will make sure to pass that on to our course developers, for future video courses.
Happy learning!
@@realpars thanks lad
Good suggestion. We need more examples. Thank you Realpars for the videos.
Thank you very much!
You're very welcome, Kevin! Happy learning
@@realpars Yes 🥰
❣️well explained... Need more related videos
Thank you! Clear and easy to understand as usual. You are the best on CZcams
Thanks a million, Mark! We are very happy to hear that.
awesome video thank you, definitely subscribing
Awesome, thank you!
This is fascinating!
Glad to hear that! Thank you very much!
Excelente video, muy clara la explicación
Gracias, Jesus!
Very helpful ..
Thankyou sir 🙏
You're very welcome!
Thank you guys
Great job👍👍👍
Our pleasure!
It would be better to show time charts for comparison.
Question. can i add a timer that is 12 hour long or more?
i'll use to control a street light system. thank you in advance
Depending on the PLC manufacturer, the maximum setpoint of an IEC timer is 10000 seconds (2h 46m 40s) as shown in the video. To go longer, set up a 3600-second timer, and when it times out, add 1 to an integer variable that counts hours, and then reset/restart the timer again.
What IDE are you using?
Thank you for your question. This video discussed using the hardware and software related to AB RS Logic Micro Starter Lite.
I hope this answers your question; if not, please let us know.
Happy learning!
Awesome , Consider about Doing a video on analog programming
Hey!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
What happen,when RTO is counting time and timer reset command triggered ?
The RTO timer resets. A reset command will always reset the timer when activated. If the input logic to the RTO is still true, the timer will keep timing, but from zero.
I always get confused when the reverse operation logic gets involved like with the second timer.
I struggled a bit too in the beginning. Then I realized that NOT operand is very handy in many timer applications to switch output(s) into different state. Some logics such as even Siemens logo have handy combined on/off timers. Also Logo's programming style was spot on for me to visualize how things affect each other. It helped tremendously to understand what happens with each style of timers. It's documentation is also very good imo.
Thanks Realpars
You're very welcome!
thanks for sharing ,
Our pleasure, Steven!
great video!
Glad you enjoyed it!
Super!
Good 👍
Do you have any courses/resources on motion control programming?
We have a few CZcams videos on motion control (czcams.com/play/PLln3BHg93SQ9CxFxL9L1ZLorPhFjFuvFN.html).
Do you have a course about Allen Bradley's
Hi Abdullah,
Thanks for your comment!
Sure, although we mostly focus our course videos on Siemens, we do have a couple of course videos on Allen Bradley. We are planning to add more courses to our Allen Bradley section in our course library, but we do not have any of those courses scheduled yet. Feel free to have a browse through our course library to see which topics we cover at the moment. bit.ly/30ZrxWq
I want to learn Plc and DCS system like siemens PCS 7 software if anybody kmow this pls teach me
Hi there,
Thanks for your comment, and great to hear your enthusiasm!
In that case, our course library would be a great option for you. Our course library is filled with over 500+ courses, covering a variety of topics for automation engineers. Including a start-to-finish course on PLC Programming.
Feel free to have a look around learn.realpars.com/collections
Additionally, you will have access to our Technical Team - consisting of high-ranking engineers with a lifetime of experience - who are here to help you out with any questions you might have along the way!
Hope this helps!
Sir make video on S7 Timer
Hey!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
PREPARE LESSONS FOR A HIGHER LEVEL
PLEASE
Thanks for your suggestion, Yahya! Happy learning.
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