I can easily grab SNP-Chip data from NCBI's GEO database for a given Illumina SNP-Chip array, e.g. from here: https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE52147
GEO provides data as SOFT formatted family file(s), MINiML formatted family file(s) or Series Matrix File(s).
I'm looking for a way to convert these into PED and MAP files for use in PLINK...
Or does PLINK read these formats natively?