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2 Instruction Descriptions
NJ-series Instructions Reference Manual (W502)
Sequence Output Instructions
2
RS
The following figure shows a programming example and timing chart.
• The RS instruction behaves like the following self-holding rung.
• However, if the RS instruction is in a master control region and the master control region is reset,
the behavior will not be the same as the above self-holding rung.
• Never use an NC bit directly from an external device for the Reset1 input. The internal power supply
in the Controller will not turn OFF immediately when the AC power is interrupted (even for momentary
interruptions), and the input from the Input Unit may change to ON first. This could cause the Reset1
input to change to TRUE.
• If this instruction is used in a ladder diagram, the value of Q1 is retained if an error occurs in the pre-
vious instruction on the rung.
• If this instruction is not executed due to the execution of a jump instruction (e.g., the JMP instruction),
Q1 retains the value from the last execution.
• If this instruction is in a master control region and the master control region is reset, the operation is
as follows:
• If the value of Reset1 is TRUE, the value of Q1 is retained. If the value of Reset1 is FALSE, the
value of Q1 changes to FALSE.
• FALSE is input to the instruction that is connected to Q1 even if the value of Q1 is TRUE.
Additional Information
Instruction/rung Value of B Value of abc
RS instruction TRUE Not changed.
FALSE FALSE
Self-holding rung TRUE FALSE
FALSE
Precautions for Correct Use
RS_instance(A, B, abc);
LD ST
B
A
abc
RS
Set Q1
Reset1
RS_instance
Set=A
Reset1=B
TRUE
FALSE
TRUE
FALSE
Q1=abc
TRUE
FALSE
A
B
abc
abc
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