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5-19-3 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 C Error and Arithmetic Flag Operation for a table listing the
instructions that affect CY.
5-19-4 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.”
CY is automatically reset to “0” when END(01) is executed at the end of each
cycle.
Note Refer to Appendix C Error and Arithmetic Flag Operation for a table listing the
instructions that affect CY.
5-19-5 BCD ADD – ADD(30)
Au: Augend word (BCD)
IR, SR, AR, DM, HR, TC, LR, #
Ad: Addend word (BCD)
IR, SR, AR, DM, HR, TC, LR, #
Ladder Symbols
Operand Data Areas
R: Result word
IR, SR, AR, DM, HR, LR
ADD(30)
Au
Ad
R
@ADD(30)
Au
Ad
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 CY R
Flags ER: 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.
BCD Calculations Section 5-19