IAI America S-SEL-E - Manual (Page 113)

Page 108
3. Flags
The function of flags is to set and reset data within "Memory." This is analagous to "internal relays" or "coils" in a PLC.
In general, there are two (2) types of flags: Global flags 600 ~ 887 which can be used in all programs and local flags 900 ~ 999
which can be used only in individual programs.
Global flags can be saved when the power is turned OFF (battery backup). Local flags are erased when the power is turned
OFF.
Program 1 Program n
WTON 600
Communicates signals
by using global flags which
are visible in all programs.
Turn Flag 600 ON
Waiting for Flag 600 to turn ON
Even though these are the same
command, these local flags exist
individually in each program.
BTON 900 BTON 900
BTON 600
Chapter 4. Programming
Flag Number 600~887 Global flag: Can be used in all programs
Flag Number 900~999 Local flag: Can be used only within an individual program