S7 Convert Word to Signed Integer

I may be being a bit slow here but is there any way in Step 7 that you can convert a Word value to a signed integer value?

Am sure its possible just not sure how?

I am receiving an Hex Number that can be either signed or unsigned so want to configure a block that allows toggling between types!

What would you use that block for? I see potential misunderstanding of what "hex numbers" are.

Basically the values are monitored values from and external system. I just want to take the 16 bit values, decode and change to real numbers for feedback to the site wide system.

I am guessing that the value enters your system via Profibus or Profinet as IO. And in the symbol table the word address(es) that contains the value(s) are formatted as WORDs.
WORDs will display as HEX values when you monitor them online.
Simply change these symbols to INTs and you are done. Maybe you have to save the blocks that use the word addresses and download again.
This doesnt actually do anything except from telling the program that the bit pattern is to be interpreted as INT values.

In case you mean that the dataword(s) are actually formatted as BCD, then you can convert to INT by the STL instruction BTI.

NB. INTs and REALs are different things.

For signed integer use


For unsigned "integer" use

I haven't tried it but believe if you just move the word into an integer you will have access to addresses where you can use the data as a word or an integer.