S7-1200, change Timers in HMI

Hello
Just started to work with the KTP400 HMI and s71200, and basicly I'm a beginner to the whole PLC world.
All I want to do is be able to change the time of my timers in my HMI.

I want a field where I can write the new time and a button to send the new time to my timer. How do I do?

Regards

Create the timer in the PLC program. Instead of entering a constant for the timer value enter a M word (with correct data type). Then open your HMI screen in a split window with your program and drag the timer tag onto the screen.

Thank you! I thought it was something like that!

The problem I have is that I know plc programming but on this job I have to do some more advances calculations and use the memory more. Is there any good guides for that? For example, how do I know what data type I should have?

Regards

Memyself would use FLOATING POINT values (REAL datatype) that way I dont have to worry about doing the multiplications first and the divides last and such to get the best accuracy when doing calculations with integers...

But true this varies from case to case.. What calculations is needed to do in your project?

It's mostly add or sub.

I want the time of the timers to be editable.
I want to edit them by pressing buttons. So if i activate input 0.0 I should add for example 1second to the timer.

Regards

Ok if its timers then you should use DINTs why?

The timers use the TIME format wich really is a DINT where a value of 1 means 1ms..

So if you add 1000 to the TIME variable you have added 1s..

So what should I write on my preset value? If i write 1000 there I get T#1000ms.

I guess I can't modify that value ? Because It's the same text on all of my timers.

So I should write a memory value instead? I wonder, what should I write here?

If you type 1000 without any sort of unit it will default to ms. You can write 10h30s400ms instead if you want. Give it a go. Easy enough? As with the memory timer thing you can see there how you simply put in a "Marker double word" (of data type DINT)(supposed grammar of Siemens) to the timers preset input.

Thank you! It was the Memory Assigning I had problem with since I haven't been working with it. And I just can't seem to find anywhere to read about it. I really want to learn but there isn't any classes right now. That's why I came here, you guys are great! Thank you

I've noticed that my value I give my timer from the HMI doesn't stay after powerbreak. Is there a way to make it so? Another memory that isn't temporary maybe?

I've read about retentive memory and I guess it should be a retentive memory? When I Select properties for my "MD1" memory I see a box "retained" but I can't check it.

Create a global data block and make sure you select "symbolic access only". In the new data block create your time preset tag and there you can check the box that allows you to retain the value after shutdown.

Tip: To keep your program tree a little neater and easier to work with, create a "global data block" and store ALL of your program data there. Also inside that data block you can also create your timer and counter data types so that avoids having to create a new instance data block everytime you insert a new IEC_Timer or IEC_Counter

Tip: Be aware with the 1200's that everytime you download to the CPU all values will revert back to their initial values. This is a nasty property and a real pain in the *** to work with. There is a work around using a job mailbox pointer with your HMI.

Tip: Go to the Siemens website. There's a heap of FAQ's and some really good blocks available written by the Siemens guys. You'll learn alot from 20 hours trying out every FAQ.

Theres a lot thats a pain withe the 1200 and the software



Although i do like it

504bloke said:

Theres a lot thats a pain withe the 1200 and the software



Although i do like it

Click to expand...

haha! Lets hope V11 saves it.