Yaskawa YASNAC PC NC PLC Programming Manual - Manual (Page 55)

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YASNAC PCNC PLC Programming Manual Chapter 6: PLC Instructions
(c) Explanation
• An ST contact must be entered before the DCR instruction.
• The DCR instruction is executed in intervals of “4 × n” msec while the ST contact is
ON.
• There is no function to detect overflow. If a timer counts to 0H, it returns to FFH.
(d) Example
(3) CLR (Clear) RR after operation: RR-
(a) Function
The instruction clears the content of the register “0” when the ST contact is ON (RR = 1).
If the ST contact is OFF (RR = 0), the content of the register is not cleared.
The RR content remains unchanged before and after the execution of the CLR instruction.
(b) Format
(c) Explanation
• An ST contact must be entered before the CLR instruction.
• The CLR instruction is executed in intervals of “4 × n” msec while the ST contact is
ON.
(d) Example
D Paradym31 Variable Name