Chapter 6 FBD Block Diagram Programming 135
※ Logic Block include: AND, AND EDGE, NAND, NAND EDGE, OR, NOR, XOR, NOT, RS, PULSE,
BOOLEAN. Each logic block occupied a BLOCK; the available number is limited by the number of B and system
memory space. Logic function blocks source show as blow table:
Logic Block number System memory (byte)
AND 1 8
AND(EDGE) 1 8
NAND 1 8
NAND(EDGE) 1 8
OR 1 8
NOR 1 8
XOR 1 6
RS 1 6
NOT 1 4
PULSE 1 4
BOOLEAN 1 12
Example: calculating resources
Number Function / Logic Memory bytes Function number
B001 AND 8
B002 Timer mode 7 12 T01, T02
B003 Counter mode 1 14 C01
B004 NOT 4
B005 MD 11 MD01
B006 DR register 6 DR01
B number Memory bytes
Memory space limits in SG2 260 2600
Resource used by program 6 55
Still available in SG2 254 2545
Input coils: I01, X01, M01, I02;
Output coils: H01, N01;
Normal ON: Hi001;
Analog input: A01;
Analog output: AQ01;
Logic and function block: B001~B006.
Coil input/output and analog input/output
don’t occupied B number and memory
space.
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