2-63
2 Instruction Descriptions
NJ-series Instructions Reference Manual (W502)
Sequence Control Instructions
2
MC and MCR
If the value of In is TRUE, then master control is not reset. The POUs in the master control region oper-
ate normally.
The operation of the POUs when master control is reset depends on the POU as described in the fol-
lowing table.
POU Operation during a Master Control Reset
POU Operation
Out and OutABit instructions FALSE is output to the specified variable.
OutNot instruction FALSE is output to the specified variable.
Set and Reset instructions The output from before the master control reset is retained.
TON instruction The instruction operates with a FALSE value for timer input In. That
means that the timer is reset. The value of elapsed time ET changes to 0
and the value of timer output Q changes to FALSE.
TOF instruction The instruction operates with a TRUE value for timer input In. That means
that the timer is reset. The value of elapsed time ET changes to 0 and the
value of timer output Q changes to TRUE. However, if an Out instruction
is connected to Q, the execution condition to the Out instruction is
FALSE.
TP instruction The instruction operates with a FALSE value for timer input In. That
means that the timer is reset.
Timing active: The value of elapsed time ET is incremented to the
end and then returns to 0. The value of timer output
Q is TRUE until the end of timing, and then it
changes to FALSE.
Timing not active: The value of ET changes to 0 and the value of Q
changes to FALSE.
However, if an Out instruction is connected to Q, the execution condition
to the Out instruction is FALSE even while timing is active.
AccumulationTimer instruction The instruction operates with a FALSE value for timer input In. That
means that the timer stops. The values of elapsed time ET and timer out-
put Q are retained. However, if an Out instruction is connected to Q, the
execution condition to the Out instruction is FALSE even if the value of Q
is TRUE. However, reset Reset is enabled.
Timer instructions The instruction operates with a FALSE value for timer input In. That
means that the timer is reset. Remaining time ET is set to the value of set
time PT, and the value of timer output Q changes to FALSE.
CTU, CTD, and CTUD instructions These instructions are not executed. If one of these instructions was
operating before the master control reset, the count value from before the
reset will be held and the Counter Completion Flag Q will be FALSE.
JMP instruction This instruction is not executed.
FOR and NEXT instructions These instructions are not executed.
Master control region
UINT#1
UINT#1
A
MC
In ENO
MCNo
MCR
EN ENO
MCNo
The value that is output from the LD instruction changes
to FALSE regardless of the value of variable A.
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