Invalid property specifiers are lines of PPCL that contain a number or name that either does not exist in a target object instance or is not accessible in PPCL programs. Lines that include invalid property specifiers are indicated by the line status F.

In the example below, line 20 references a property that does not exist in analog input objects.

10  ET  LOCAL(MYPOINT)
20  E F GETVAL(MYPOINT, ROOMTEMP, PrioArr, 8)