Copy byte to UDT of same Length Siemens

[JDCROCKETT724]

How do I move one byte of data in an array to a UDT that is one byte in length. AB would be a slam dunk on this with a simple Copy instruction, but this is a head scratcher. Everything I have tried has not worked or is an error at compiling. How do I do this? You can see from my attached screen shot everything I have done.

I have accomplished what I am looking for by moving my byte to another byte in my static variables. Then I create a tag with my UDT below it with the AT datatype, but I feel this is hokey. I should be able to do this with a simple instruction.

Thoughts?????

1500 PLC with V16 of portal

 

[L D[AR2P#0.0]]

Use blkmov, e.g.


https://screenrec.com/share/MZoy4Hulbr

 

[L D[AR2P#0.0]]

Pic instead:

 

[JDCROCKETT724]

Thanks for the reply. I didn't think to look into the Legacy instructions. However, this is inside of an FB that we plan to use throughout our line. When I put it into the FB then both my UDT variable and the Byte that is in the array are red. Also shown is me trying to get the move block variant to work without success.

 

[L D[AR2P#0.0]]

Thanks for the reply. I didn't think to look into the Legacy instructions. However, this is inside of an FB that we plan to use throughout our line. When I put it into the FB then both my UDT variable and the Byte that is in the array are red. Also shown is me trying to get the move block variant to work without success.

Can you explain what the variables are in the FB?
i.e. input/output/inout/stat/temp


(Previous post deleted as I realised your UDT is not just 8 bools )

 

[L D[AR2P#0.0]]

Use your own block to copy the bools from the byte to the individual elements of the UDT e.g.

 

[JDCROCKETT724]

The "Status" variable is a Static variable and the "RawInputs.RawInputs[1]" is an input variable. I have an array of bytes from my device that I need to break down to what they mean. I tried to use a UDT for the PLC tag, but thank to the vendor and them breaking up the bytes in uneven numbers it throws the mapping off. So I thought if I just brought them into the FB as an array of bytes that I could easily copy them to a static variable.

 

[JDCROCKETT724]

That is certainly another way to do it, but I was looking for a nice clean way to do it. In the AB world a simple copy instruction would handle this with no problem. Copy byte to UDT with a length of 1. I was just hoping there was a clean way to do it in Siemens. I might just stick with my other way of doing it by using the AT function in the tags. Although that is not very intuitive to others who are not familiar with some of the higher functions of Siemens like maintenance personel.

 

[mk42]

Do you actually NEED the data as an array of bits anywhere? How does it get into that form in the first place?



If the data comes in as PLC inputs, you can assign the whole structure to a UDT. Obviously, you'd need to make sure you include reserve/spare/blanks whereever things are uneven.

Also, on a related question, the commands Serialize and Deserialize can be used to move an array of bytes to a UDT or vice versa. Doesn't help for array of bits though.


Technically, you can also declare your data as unoptimized and do things with absolute addressing, but that usually complicates things.



If you can't map the data type directly at the input, I'd recommend LDs strategy of making an FC to do the mapping for you.

 

[Lare]

From Siemens website:
https://support.industry.siemens.co...d-data-in-step-7-(tia-portal)-?dti=0&lc=en-WW

 

[kalabdel]

Would this work?

 

[L D[AR2P#0.0]]

No, The OP's UDT contains other data types as well as bools.

 

[kalabdel]

Are you sure? InstantValue is outside the tag Status which is the UDT.

 

[L D[AR2P#0.0]]

Well spotted......tested and yes, this will work with my data blocks. Will have to check using STATs in FB.

 

[L D[AR2P#0.0]]

All three methods posted work from inside an FB. Not sure what's different in the OP's system.