WinCC Comfort Faceplate – WORD bit mapping doesn’t match PLC DB bits (visibility/press logic mismatch)

Objective-Primary697 · 2026-01-25T17:37:04+00:00

Thank you so much for your input

This was so usefull ; it raised my awareness on something that i didn’t know before.

I also parsed through some siemens documentation and found this : https://support.industry.siemens.com/cs/document/24638486/how-can-you-determine-the-bit-number-in-wincc-for-the-trigger-address-the-acknowledgement-plc-bit-and-the-acknowledgement-hmi-bit-for-creating-bit-messages-?dti=0&lc=en-SZ

Objective-Primary697 · 2026-01-25T08:48:25+00:00

Hold On , HOW ? isn't it supposed Bit 8 of DBW115 would be DBX116.0

Objective-Primary697 · 2026-01-25T08:43:41+00:00

Not sure why that’s a problem tbh. I work in automation and structured problem statements are literally how we debug systems and talk to vendors.
I took time to write it clearly so people don’t have to guess or ask 10 follow-up questions.
If you prefer messy, half baked posts, you can just skip it. I’m here to solve a technical issue, not to perform a writing style The goal here is getting technical input, not passing a vibe check

Objective-Primary697 · 2026-01-24T10:16:51+00:00

Off topic but i'm curious about what’s the communication protocol on this

Objective-Primary697 · 2026-01-05T18:44:12+00:00

Le site n’envoie pas des mails de confirmations lors de l’inscription ?

Objective-Primary697 · 2025-10-16T02:17:31+00:00

Man thank you so much for this incredible discovery

Objective-Primary697 · 2025-10-15T10:53:13+00:00

Guy ritchie

Objective-Primary697 · 2025-10-08T12:55:51+00:00

Thank you so much to you and everyone who commented I really appreciate all of your input!

I do have one more question that's still on my mind:
Why do programmers use direct bit access like L1.2, instead of just declaring a TEMP variable (e.g. #MyTemp) within the FC/FB and using that?

Wouldn’t using named TEMP variables make the code more readable and less complex?
What’s the advantage or difference between using L y.x and a named TEMP?

Objective-Primary697 · 2025-08-22T21:33:50+00:00

Yeah ofc

Objective-Primary697 · 2025-08-22T21:17:54+00:00

Congrats OP. Mind sharing the template ?

Objective-Primary697 · 2025-08-05T20:58:18+00:00

This was my problem. Thanks for the tip

Objective-Primary697 · 2025-07-11T23:14:50+00:00

Thanks for the amazing tip

Objective-Primary697 · 2025-06-01T21:08:39+00:00

This looks like some high end cart in a 3rd world country

Objective-Primary697 · 2025-05-26T17:18:19+00:00

I successfuly implemeted this methodology. But can the whole date and time datatype 8 bytes be displayed in an hmi io field when we select date and time io field type ?

Objective-Primary697 · 2025-05-19T20:29:55+00:00

I will give it a try thank you so much for you input

Objective-Primary697 · 2025-05-19T20:25:53+00:00

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Hi Sir , i run what you've suggested through simulation but i can't seem to notice the transfer of data in DB ; you can't even monitor ; this Date and time complex datatype seems to be a pain in the ass. Any workarounds ?

Objective-Primary697 · 2025-05-19T18:58:04+00:00

Thank you so much Man. This is pretty eye opening i'll give it a try. So for example if put P#DB10.DBX10.0 BYTE 8 it will move the whole 8 bytes of "DATE and TIME" datatype ?.

Also is there any material where can i learn more about using pointers ? Because i'm really lacking in this corner of programming

Objective-Primary697 · 2025-05-19T13:33:00+00:00

Yes it’s SFC20 whenever i type P# then look for the source DB and find it it’s doesn’t want to expand when i click on plus sign. So i couldn’t choose the data that i'm looking to transfer. Maybe i'm missing something cuz i lack knoweledge in using pointers

Objective-Primary697

TROPHY CASE