Hi all

V13SP1

I use udt and faceplate
I try differents thing and it seems that i have better result when I use word, instead of bool things in my udt

udt type 1
- word

udt type 2
- bool0
- bool1
- bool 2
...
- bool15

In the PLC, with type1, i use slice like  word.%x1.
But of course it's convenient to use the type2

But now, when I visualise with a tp1200 for example, with faceplate that use this udt, "it seems to me" displaying type1 is quicker than type2
That's illogical. Am I dreaming ?

Thanks !

sixthomas

Hi all

V13SP1

I use udt and faceplate
I try differents thing and it seems that i have better result when I use word, instead of bool things in my udt

udt type 1
- word

udt type 2
- bool0
- bool1
- bool 2
...
- bool15

In the PLC, with type1, i use slice like  word.%x1.
But of course it's convenient to use the type2

But now, when I visualise with a tp1200 for example, with faceplate that use this udt, "it seems to me" displaying type1 is quicker than type2
That's illogical. Am I dreaming ?

Thanks !

The HMIs have been designed to handle bits-in-a-word natively. The WORD is one tag and communicates as such.

The group of booleans is however several tags - the update of those done as individual tags (handled as a WORD for each).The consumption of tags to the HMI for engineering purposes is small but the communication data involved has a bigger footprint.

The most effective is to keep with BYTE / WORD / DWORD and let the HMI decompose to bits with its native functions.

ok.
Is it the same thing with PLC ? when use udt interface with FB/FC ? (I think it's negligible, but when you want optimize your program...)

Is there a way to use the command AT with a word come from an UDT ?
Or directly when create the word in an udt ?

If I don't want to use slice :
- I can copy/paste the words from my UDT to local words, and then use AT command
- I can create all plc program with "normal udt" (with DB_REAL) and then, copy what I need to a DB_HMI ; but I have to manage the reading/writing within DB_HMI and DB_REAL
but at every change, I have to modify my udt, my plc program, my other udt"hmi" and my faceplate....

This solutions are not "pretty"

sixthomas

ok.
Is it the same thing with PLC ? when use udt interface with FB/FC ? (I think it's negligible, but when you want optimize your program...)

Is there a way to use the command AT with a word come from an UDT ?
Or directly when create the word in an udt ?

If I don't want to use slice :
- I can copy/paste the words from my UDT to local words, and then use AT command
- I can create all plc program with "normal udt" (with DB_REAL) and then, copy what I need to a DB_HMI ; but I have to manage the reading/writing within DB_HMI and DB_REAL
but at every change, I have to modify my udt, my plc program, my other udt"hmi" and my faceplate....

This solutions are not "pretty"

Hello.

There is no choice but working with WORD variables, when working with native HMI alarms. Using a structure of bits that is (AT) overlay with a WORD works well. Later TIA versions offer other options for the later versions of S7-1x00 - not in Step7 V13 SP1.

Not all exchanges are for alarms. There engineering choices come in.

The decision is yours to make: (choose one)
1. Optimal communications; using WORDs.
2. Comfortable self-documenting structures.
3. Combine (1) and (2) where FB/FC convert from structures to WORDs.
4. Use absolute addressing to link HMI to PLC.

It would be interesting to hear what engineers working for Siemens have in mind on this topic.

Regards. 

#dP

  Later TIA versions offer other options for the later versions of S7-1x00 - not in Step7 V13 SP1.

It would be interesting to hear what engineers working for Siemens have in mind on this topic.

https://support.industry.siemens.com/cs/de/en/view/109740340

I don't find ,do you have a link ? (except "serialize", only available for 1500)

sixthomas

 https://support.industry.siemens.com/cs/document/109740340/delivery-release-for-simatic-step-7-professional-basic-v14?dti=0&lc=en-DE

I don't find ,do you have a link ? (except "serialize", only available for 1500)

Step7 V13 SP1 Update 9  (and later)
S7-1200 FW4.1  (and later)

Step7 V14 SP1 Update Update 6
S7-1200 FW4.2
(notice the changes: gather / scatter)