962
Other Instructions Section 3-29
Variations
Applicable Program Areas
Description When the execution condition is ON, CLC(040) turns OFF the Carry Flag
(CY). Although CLC(040) turns the Carry Flag OFF, the flag will be turned ON/
OFF by the execution of subsequent instructions which affect the Carry Flag.
Flags
Precautions +C(402), +CL(403), +BC(406), and +BCL(407) make use of the Carry Flag in
their addition operations. Use CLC(041) just before any of these instructions
to prevent any influence from other preceding instructions.
–C(412), –CL(413), –BC(416), and –BCL(417) make use of the Carry Flag in
their subtraction operations. Use CLC(041) just before any of these instruc-
tions to prevent any influence from other preceding instructions.
ROL(027), ROLL(572), ROR(028), and RORL(573) make use of the Carry
Flag in their rotation shift operations. When using any of these instructions,
use STC(040) and CLC(041) to set and clear the Carry Flag.
Note The +(400), +L(401), +B(404), +BL(405), –(410), –L(411), –B(414), and
–BL(415) instructions do no include the Carry Flag in their addition and sub-
traction operations. In general, use these instructions when performing addi-
tion or subtraction.
3-29-3 EXTEND MAXIMUM CYCLE TIME: WDT(094)
Purpose Extends the maximum cycle time, but only for the cycle in which the instruc-
tion is executed. WDT(094) can be used to prevent errors for long cycle times
when a longer cycle time is temporarily required for special processing.
Ladder Symbol
Variations
Variations Executed Each Cycle for ON Condition CLC(041)
Executed Once for Upward Differentiation @CLC(041)
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
Name Label Operation
Error Flag ER ---
Equals Flag = ---
Carry Flag CY OFF
Negative Flag N ---
WDT(094)
T
T: Timer setting
Variations Executed Each Cycle for ON Condition WDT(094)
Executed Once for Upward Differentiation @WDT(094)
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification Not supported.
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