You mention PQW, and then you must be aware that it is a peripherial output word, not a 'normal' output word. Special conditions apply.
Read this regarding peripherial inputs and outputs:
The "P" in PQW does not relate to if the outputs are addressed via Profibus or not.
The "P" relates to that the address is outside the process image.
If outside the Process image, the output(s) must be set by a Peripherial access, like this:
L "SomeStatusWord".
T PQW256
Individual bits outside the process image cannot be read or written.
The smallest size of peripherial data that can be read or written is a byte.
It is possible to use an intermediary address, for example a merkerword if you want to access individual bits.
For example:
L PIW256
T MW20
A M20.0 // using one bit from the peripherial input word
= "somestatusbit"
A M20.1 // using another bit from the peripherial input word
= "otherstatusbit"
etc.
But the typical way to avoid this hassle is to assign bits within the process image. Words (for example analog i/o) are typically assigned to addresses outside the process image.