452
Symbol Math Instructions Section 3-11
Description –B(414) subtracts the BCD values in Su from Mi and outputs the result to R. If
the result of the subtraction is negative, the result is output as a 10’s comple-
ment.
Flags
Precautions If Mi and/or Su are not BCD, an error is generated and the Error Flag will turn
ON.
If as a result of the subtraction, the content of R is 0000 hex, the Equals Flag
will turn ON.
If an addition results in a borrow, the Carry Flag will turn ON.
Examples When CIO 000000 is ON in the following example, D00110 is subtracted from
D00100 as 4-digit BCD values, and the result will be output to D00120.
3-11-14DOUBLE BCD SUBTRACT WITHOUT CARRY: –BL(415)
Purpose Subtracts 8-digit (double-word) BCD data and/or constants.
Ladder Symbol
Variations
RCY
–
(BCD)
(BCD)
(BCD)
Mi
Su
CY will turn
ON when there
is a borrow.
Name Label Operation
Error Flag ER ON when Mi is not BCD.
ON when Su is not BCD.
OFF in all other cases.
Equals Flag = ON when the result is 0.
OFF in all other cases.
Carry Flag CY ON when the subtraction results in a borrow.
OFF in all other cases.
–BL(415)
R
Mi
Su
Mi: 1st minuend word
Su: 1st subtrahend word
R: 1st result word
Variations Executed Each Cycle for ON Condition –BL(415)
Executed Once for Upward Differentiation @–BL(415)
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification Not supported.
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