Yaskawa YASNAC PC NC PLC Programming Manual - Manual (Page 71)

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YASNAC PCNC PLC Programming Manual Chapter 6: PLC Instructions
(c) Explanation
• A ST contact must be entered before the ADDW instruction.
• The ADDW instruction is executed in intervals of “4 × n” msec while the ST contact is
ON.
• There is no function to detect overflow. Make sure that the result will not exceed
FFFFH.
(d) Example
(27)SUBW (SUB Word Register) RR after operation: RR-
(a) Function
The instruction executes subtraction between the contents of double-length register
(WR2) and double-length register (WR1) when the ST contact is ON (RR = 1) and
stores the result to register (WR2).
If the ST contact is OFF (RR = 0), the ADDW instruction is not executed.
(b) Format
(c) Explanation
• A ST contact must be entered before the SUBW instruction.
• The SUBW instruction is executed in intervals of “4 × n” msec while the ST contact
is ON.
• There is no function to detect underflow. Make sure that the following is always
satisfied WR1
≤
WR2.
A B Paradym31 Variable Name