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Increment/Decrement Instructions Section 3-9
Operation of @– –B(596)
The up-differentiated variation is used in the following example, so the BCD
content of D1000 will be decremented by 1 only when CIO 0.00 has gone
from OFF to ON.
3-9-8 DOUBLE DECREMENT BCD: – –BL(597)
Purpose Decrements the 8-digit BCD content of the specified words by 1.
Ladder Symbol
Variations
Applicable Program Areas
Operand Specifications
@− −B
D1000 D1000
−1
0.00
D1000
CIO 0.00
Decrement Decrement
Wd: Wd:
Decremented only
for up-differentiation.
: Execution of @− −B(596)
− −
BL(597)
Wd
Wd: First word
Variations Executed Each Cycle for ON Condition ––BL(597)
Executed Once for Upward Differentiation @– –BL(597)
Executed Once for Downward Differentiation Not supported
Immediate Refreshing Specification Not supported
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
Area Wd
CIO Area CIO 0 to CIO 6142
Work Area W0 to W510
Holding Bit Area H0 to H510
Auxiliary Bit Area A448 to A958
Timer Area T0000 to T4094
Counter Area C0000 to C4094
DM Area D0 to D32766
Indirect DM addresses
in BCD
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants ---
Data Registers ---
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