Thanks for the correction.
There isn't a built-in instruction with a selectable radix and/or bit order that will do this conversion for you.
Fortunately it's easy just with EQU and OTE to examine each character of that fixed-length string and set a bit sub-element inside a DINT tag, as long as you are certain which characters of the string represent your encoded value.
Just compare GetStringIDtmp.Data[0] to 49 (ASCII = "1") and set Bit 0, and so on for .Data[0] through .Data[7], to set Bits 0-7.