SmartAXIS Touch User’s Manual A-15
7 FBD Program
Appendix
7.5 FBD Program Limitation
FBD programs have a limitations on the program size and the number of FBs. Even when the FBD program is less
than the maximum size, FBs cannot be added to the FBD program if the number of used FBs is at the maximum.
The size of the FBD program is the total of the size of all FBs used in the FBD program.
The number of Block (B) is the number of FBs that use blocks (B) in the program. The number of Timer (T) and
Counter (C) is the total of devices used in the timer FB and counter FB. These are not the number of timer FBs and
counter FBs.
Maximum size of FBD program 38,000 bytes
Maximum number of blocks, timers,
and counters that can be used in the
FBD program
Block (B) 1,000
Timer (T) 200
Counter (C) 200
The timer FB, counter FB, and depending on the FB, multiple devices may be used. For details about each
FB, refer to the description in the "SmartAXIS FBD Programming Manual".
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