When CX-Programmer compiles a program with AT assignments, it treats these memory locations as hardware-bound. If the variable is an Input ( %I ) or Output ( %Q ), the PLC operating system "locks" these addresses because they are refreshed by the I/O bus scan. Attempting to force a value into a "Fixed" memory address that is being actively updated by hardware creates a race condition.
A single wrong character in a URL can lead to a failed page load. It's always worth double-checking: waaa087 fixed
