TIA Portal: Optimized Block Access / Optimized vs Standard Data Blocks 

One of my favourite videos. You always manage to explain rather complex concepts in a very easy and clear way. Thank you PLC god! :)

Only like us (programmer man)understand ur hard work to explain.well done, mat ur true legend.big respect 🙏

Nice and easy conceptual understanding, I follow your channel time to time when some question arise and got the easy explanation. Thanks a lot Hegamurl for making hard thing easy .❤

when Hegamurl opens that PPt there is no way you get left behind on a concept...Your illustrations are a lot helpful.

You have a very nice and to-the-point way of explaining things! Thank you. Subscribed!

As usual very informative and practical information, delivered in pleasant manner. Keep doing.

Amazing videos. Exceptional quality. Thank you so much

I love what you do! THX for this videos!

Thank you for fun and easy to understand explaination😊. Newbie PLC programer here from Philippines.

Thank you! My favorite teacher !💪

This was very helpful. Much appreciated.

Great video

Very nice video in easy way...thanks a lot..

Very good. Fantastic

Great video sir.... ❤️

Thanks for another great video! How about creating for example a shift register, i'm doing the shift registers by writing into the single bits of a W or DW. To be able to do that the DB has to be standard, i guess. Is there a better way to do that kind of things? Thanks again from Sweden

Excellent

That was a very good lecture

Thank you for the video Hegamurl! I'm having a little bit of trouble fully comprehending how the data types in the DB's connect to a physical piece of equipment. Whether this is a standard block or DB. Do you by chance have any videos regarding this that Im overlooking?

I have always been working with your examples in conjunction with mine and have been noticing positive results are display your explanation is better and my request is that if you can be able to show us the video of wiring the two Plc in real way thanks

I have an s7-1500 running a bottle transport program divided into 3 units, the data block used is data block optmizer. I read your article on both topics, I would like to know how I can read these data Block optmizer by nodered? Would you help me? Thank you very much.

Hi, When we insert a boolean variable in DB, why it blocks 2 bytes? For example if I plcae variable 1 as word, variable 2 as boolean and variable 3 as word. Why 2nd variable blocks whole 2 bytes, instead it can block 1 byte in which it is placed and variable 3 can start from 5.0.

Your explanation is superb, could you please make a video of how do all data types work in TIA, thanks.

I'd like to move contents arrResult(30) up to arrResult(37) of an optimised DB, to unoptimised DB. What would be the correct instruction?

I can't uncheck the optimized bloc access in TIA Portal V15.1 for an already created instance DB. May I know what may be the reason?

If you use standard block with bool values at the end, you optimize memory it to the word and have speed advantage and absolute adressing of standard blocks? Cpu does not have to use extra “optimize” instructions for optimized allocations.

Nice topic! I checked how the optimized access works on real hardware in terms of memory usage and noticed strange things. By checking memory occupation in Resources, noticed that optimized DB occupied more memory than standard DB. Have you maybe checked this?

Holy cow . Siemens. .. I'm coming from Rockwell background.

Sir, very useful training modules thankyou for the initiative in normalising Int value min 0 max 27648 we set and input to analogue modules is 0-10V However if open circuit analogue wire maximum values changes to 32762 resulting to malfunction Please assist how to over come this issue

Hegamurl hi, Is there a way to read optimized data blocks datas from kepware ?

Very nice sir. I pray to God to give more resources to you to do such work.

I had an FB that was put on non-optimized by accedint. made the cycle time of that block go up by 30ms!. And here i was thinking why is this 1200 so god damn slow. So thats also something to remember.

when I start new projects I always try to use optimized blocks. it's the future and it's way better at manipulating data. the problem is when we are working with legacy programs, or doing some kind of Upgrade. in these cases the work to migrate to optimized data becomes very big and difficult

Hi ..you can use serialize and deserialze ...it will more easy

Keep up the good work man. by the way i am following your videos daily and still i don't know your name? please tell us more about yourself. any LinkedIn or social media or you want to go all private???

Ches man 😍

Optimized blooks are advantages of Tia than simatic manager

Stander data block is old way of data block like in Simatic manager

How about priority: absolute and symbolic, or for TIA it's not relevant?

I am from Rockwell PLC background. In Rockwell's Studio 5000 Software If I made any Integer Tag then I can use every singel bit of that integer in my program Like I made Tag name: Tag_1 then I can use every bit Tag_1.0 to Tag_1.15 as bool datatype in my program. But as in TIA if I use optimized DB Integer tag Like Tag_1 then I can't able to use every bit of that program. If I want to use every bit of integer in the program how can I use it? Via Standard DB integer address or I just need to make a Bool array for that? Thanks for your contain I almost watch your 60 videos till date One Video request for SIMATIC Log on Explanation and Usermanagment from that dump data into SQL for Audit Reporting from TIA Wincc Advance or Professional

Hi, I just wanted to comment on the size of bools for optimized and non-optimized DBs, as I think it might actually be the other way around. If we check the official TIA documentation here: support.industry.siemens.com/cs/mdm/109773506?c=77368317195&lc=en-WW, it clearly states the the length of a bool in optimized mode is one byte and not one bit, which makes me believe that in a non-optimized block a bool is actually just one bit long. I believe this is the result of how computers work: if you want to read the value of one bit at some address, the computer actually reads a whole word of data, which also contains the bit you want to know the value of. This is so, because the length of data the processor can read from memory is not arbitrary (it is word length), and the start address of a memory read is not arbitrary either (must be a multiple of word length bytes, which in case of a PLC is 2 bytes, hence the shift after a bool for the next variable in non-optimized DB (this is also called padding)). After you get this word, the processor generates a mask (also word length, having a 1 at the bit you want to find the value for) and then performs a bitwise AND operation on these two word length data. The result will tell if you had a true of false in that particular bit address. This whole thing is needed, because the vast majority of processors out there do not have bit level addressing (which would be required to be able to read values from individual bits in memory), instead they need to use the above mentioned trick to read and write (again generate mask, then bitwise XOR) data on a bit level. This is obviously sub-optimal and quite a CPU intensive task for reading a single value out, and as such if you put your bool into a whole byte instead, you don't need to perform any of those above mentioned operations, which makes the whole thing considerably cheaper. This is clearly an optimization, but it is for performance reasons and not to save memory space. All computers nowadays use this same optimization, and it is especially important for PLCs, as a considerable portion of a PLC program actually works on bools. PS.: I you want to play with how memory is read in the PLC, check the default tag table (where you can assign various types wherever you want), then look at the right side of the table. There will be a vertical bar for each variable, which will not only tell you how long a variable is (vertical size of bar), but will also show you (at least this is what I could figure out for it) how optimized the access of that variable is: the bar shifts in horizontal direction depending on the address you assigned the variable to: for an int at address MW0 the bar will be on the left, but for an int assigned to MW1 the bar will shift to the right (or might be the other way around, but you get the picture). This is a clear case for sub-optimal memory read, as the CPU will now read both MB0-1 and MB2-3 (these are word sized reads with valid read start addresses), then assemble the int from the MB1 and MB2 portions of those two read data words. The bar will be able to shift horizontally more if you play with double words (like real).

how to know the memory of the DB?................Thank you For your Wonderfull Explanation.

😄😄😄