R_Trig (Up) And F_Trig (Down) - Omron NJ501-1500 Reference Manual

2 Instruction Descriptions

R_TRIG (Up) and F_TRIG (Down)

R_TRIG (Up):
F_TRIG (Down):
Instruction Name
R_TRIG
Up Trigger
Up
F_TRIG
Down Trigger
Down
Variables
Name Meaning
Clk, In Input signal
Q, Out Output signal
Bit strings
Clk, In OK
Q, Out OK
Function
R_TRIG
R_TRIG assigns TRUE to output signal Q for one task period only when input signal Clk changes to
TRUE. Otherwise, the value of Q is FALSE. In the first task period in which this instruction is executed,
the value of Q is FALSE regardless of the value of Clk. If the value of Clk is TRUE when the power sup-
ply is turned ON, the value of Q remains FALSE until the value of Clk changes to FALSE and then back
to TRUE.
Up
The functions of the R_TRIG instruction and the Up instruction are exactly the same. The Clk variable
of the R_TRIG instruction corresponds to the In variable of the Up instruction. The Q variable corre-
sponds to the Out variable.
2-40
Outputs TRUE for one task period only when the input signal changes to TRUE.
Outputs TRUE for one task period only when the input signal changes to FALSE.
FB/FUN
FB
FUN
FB
FUN
I/O Description
Input Input signal
Output Output signal
Integers
Graphic expression
R_TRIG_instance
R_TRIG
Clk Q
Up
In Out
F_TRIG_instance
F_TRIG
Clk Q
Down
In Out
Valid range
Depends on data type.
Depends on data type.
NJ-series Instructions Reference Manual (W502)
ST expression
R_TRIG_instance(Clk, Q);
None
F_TRIG_instance(Clk, Q);
None
Unit Default
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Times, durations,
dates, and text strings