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Section 7-21
BCD Calculation Instructions
7-21 BCD Calculation Instructions
7-21-1 SET CARRY – STC(40)
Ladder Symbols
STC(40)
@STC(40)
When the execution condition is OFF, STC(40) is not executed. When the
execution condition is ON, STC(40) turns ON CY (SR 25504).
Note Refer to Appendix B Error and Arithmetic Flag Operation for a table listing the
instructions that affect CY.
7-21-2 CLEAR CARRY – CLC(41)
Ladder Symbols
CLC(41)
@CLC(41)
When the execution condition is OFF, CLC(41) is not executed. When the
execution condition is ON, CLC(41) turns OFF CY (SR 25504).
CLEAR CARRY is used to reset (turn OFF) CY (SR 25504) to “0.”
Note Refer to Appendix B Error and Arithmetic Flag Operation for a table listing the
instructions that affect CY.
7-21-3 BCD ADD – ADD(30)
Operand Data Areas
Au: Augend word (BCD)
Ladder Symbols
IR, SR, AR, DM, HR, TC, LR, #
ADD(30)
@ADD(30)
Au
Au
Ad
Ad
R
R
Ad: Addend word (BCD)
IR, SR, AR, DM, HR, TC, LR, #
R: Result word
IR, SR, AR, DM, HR, LR
Limitations
DM 6144 to DM 6655 cannot be used for R.
Description
When the execution condition is OFF, ADD(30) is not executed. When the
execution condition is ON, ADD(30) adds the contents of Au, Ad, and CY, and
places the result in R. CY will be set if the result is greater than 9999.
Au + Ad + CY
Flags
ER:
CY
R
Au and/or Ad is not BCD.
Indirectly addressed DM word is non-existent. (Content of *DM word is
not BCD, or the DM area boundary has been exceeded.)
CY:
ON when there is a carry in the result.
EQ:
ON when the result is 0.
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