Directives can be used to make the compiler to skip some program code. For example, it is possible to write different code for different PV models.
The code between #IF and #ENDIF is not compiled if the condition is false.

Example:

! directives #if #pvmodel=1 pv$="PV-x50X" #endif #if #pvmodel=2 pv$="PV-S750(+)" #endif #if #pvmodel=3 pv$="PV-Sx50" #endif #if #pvmodel=4 pv$="PV-Sx60" #endif #if #pvmodel=5 pv$="PV-S1600" #endif CONST MAX=12 #if not vardef(MAX) CONST MAX=13 #endif #if not procfuncdef!(myproc) proc myproc a,b print a,b,a*b endp #endif #if 5*7=35 print "ich kann kopfrechnen" #endif