Ecostruxure Operator Terminal Expert 3.2 How to access one bit of a Symbol linked memory word (i.e %MW10) to use for a switch variable?

[Steve_P]

Hi all, 

I know there is probably a simple solution, but I have searched everywhere for it and can't find the answer.

I have an existing M221 PLC running a STP,  which has a failing HMI that is in need of replacement (operator accident, damaged the screen) We have decided to replace it with a HMIST6500 screen and I'm in the process of changing over the code from the old Vijeo designer to the new EOTE code.

I have successfully set up the symbol link and have a list of all the tags with names etc - all good. However I have discovered that the M221 code has been written with a large proportion of the bool variables (eg, start, stop, manual, auto, forward, reverse etc) stored in words, with the idea that each word relates to a particular motor or pump.

However I have not been able to find out how to access these individual bits within the EOTE software, so far I have tried:

STPM221.Memory_Words.MW_10..3.Value

STPM221.Memory_Words.MW_10:3.Value

%MW10:X3

%MW10.3

All which do not work. I'm thinking that I will need to use a converter to isolate the required bit? Can someone please point me into the correct direction.

Also there were some rumours on one of the forums I was reading where it said that there is a Vigeo -> EOTE convertor in the pipeline - any news on this?

[Bastian_Schmitz · Accepted solution]

Hello,

The acces to a bit of a word is possible via Modbus FC Holding Registers through the Syntax

word.X0 = Bit0 of Word

...

word.X15 = Bit15 of Word

best regards

[ismailozinan]

Hello,

You can find sample programme and video for %MW10:X1 at link.

this is Bit Toggle control via EOTE.

Best Regards,

[Steve_P]

Thanks for your reply,

Yes, this will work, I knew there would be a simple approach. Just needed the right minds in the same room, Haha

Cheers

[Steve_P]

Hi Ismailozinan,

Thanks for the reply, especially the effort you have put into the video. 

Appreciate your help

Both answers work well, just a matter of figuring out which suits my application best.

Great to get fast response from the Schneider Team. Cheers.

[MrM580]

Hi Bastian_Schmitz,

I am trying to access the bit of an internal variable (i.e. one that does not have %MW address) to turn on and off a lamp. I tried "Word.X0" but it returns error. 

What is the syntax to access the individual bits of an internal variable?

See screenshot below for reference.

Thanks.

 

[Bastian_Schmitz]

A direct access to bit of a word like you show is not directly possible. You could define a specific bit position in a word as seperate variabel. In your case the best way would be to add converter. I attach a sample project from a colleague which shows how it could work. 

[MrM580]

Thank you for your prompt solution. I have used your converter method for this case. 

If I could define the bit as a separate variable as you mentioned, that would be much easier

How do I extract a specific bit position in a word as separate variable? Would it be via scripting?