This system constant is a unique value for this PLC type. It allows programs to be compiled only for the PLC type currently selected.
#if((SYS_CURRENT_PLC AND SYS_FP_XH_M8N16T_32k )<>0) #then
(* only code for the PLC type FP-XH M8N16T 32k is executed*)
#end_if;