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)