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5-20-4 BCD Subtraction: –B(414)/ –BL(415)/–BC(416)/–BCL(417)
BCD SUBTRACT WITHOUT CARRY: –B(414)
Variations
j
–B(414)
(414)
–B
Mi
Su
R
Operand Data Areas
Ladder Symbol
Mi: Minuend word
CIO, G, A, T, C, #, DM, DR, IR
R: Result word
CIO, G, A, DM, DR, IR
Su: Subtrahend word
CIO, G, A, T, C, #, DM, DR, IR
DOUBLE BCD SUBTRACT WITHOUT CARRY: –BL(415)
Variations
j
–BL(415)
(415)
–BL
Mi
Su
R
Operand Data Areas
Ladder Symbol
Mi: 1
st
minuend word
CIO, G, A, T, C, #, DM
R: 1
st
result word
CIO, G, A, DM
Su: 1
st
subtrahend wordCIO, G, A, T, C, #, DM
BCD SUBTRACT WITH CARRY: –BC(416)
Variations
j
–BC(416)
(416)
–BC
Mi
Su
R
Operand Data Areas
Ladder Symbol
Mi: Minuend word
CIO, G, A, T, C, #, DM, DR, IR
R: Result word
CIO, G, A, DM, DR, IR
Su: Subtrahend word
CIO, G, A, T, C, #, DM, DR, IR
DOUBLE BCD SUBTRACT WITH CARRY: –BCL(417)
Variations
j
–BCL(417)
(417)
–BCL
Mi
Su
R
Operand Data Areas
Ladder Symbol
Mi: 1
st
minuend word
CIO, G, A, T, C, #, DM
R: 1
st
result word
CIO, G, A, DM
Su: 1
st
subtrahend wordCIO, G, A, T, C, #, DM
BCD SUBTRACT WITHOUT CARRY
When the execution condition is OFF, –B(414) is not executed. When the execu-
tion condition is ON, –B(414) subtracts the BCD contents of Su from Mi, and
places the result in R. If the result is negative, CY is set and the 10’s complement
of the actual result is placed in R. To convert the 10’s complement to the true
result, subtract the content of R from 0000.
Mi
–
Su
CY
R
Description
Symbol Math Instructions
Section 5-20
Summary of Contents for CVM1D
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