Omron NJ501-1500

2 Instruction Descriptions
2-120
NJ-series Instructions Reference Manual (W502)
TOF
The TOF instruction outputs FALSE when the set time elapses after the timer starts.
* T#0ms to T#106751d_23h_47m_16s_854.775807ms
The TOF instruction outputs FALSE when the set time elapses after the timer starts. Set the time in
nanoseconds (ns). The timing accuracy is 100 ns. The timer starts when timer input In changes to
FALSE. Elapsed time ET is incremented as time elapses. When ET reaches set time PT, timer output Q
changes to FALSE. ET is not incremented after that. The timer is reset when In changes to TRUE. ET
changes to 0 and Q changes to TRUE.
If the timer is started and then In changes to FALSE before ET reaches PT, the timer is reset.
Instruction Name FB/FUN Graphic expression ST expression
TOF Off-Delay Timer FB TOF_instance (In, PT, Q,
ET);
Variables
Name Meaning I/O Description Valid range Unit Default
In Timer input
Input
TRUE: Timer reset signal
FALSE: Timer start signal
Depends on data type. --- FALSE
PT Set time Time from when timer starts
until Q changes to FALSE
*ms0
QTimer
output
Output
TRUE: Timer output ON
FALSE: Timer output OFF
Depends on data type. ---
---
ET Elapsed
time
Elapsed time since timer
started
*ms
Boolean
Bit strings Integers
Real
numbers
Times, durations,
dates, and text strings
BOOL
BYTE
WORD
DWORD
LWORD
USINT
UINT
UDINT
ULINT
SINT
INT
DINT
LINT
REAL
LREAL
TIME
DATE
TOD
DT
STRING
In OK
PT OK
QOK
ET OK
Function
TOF
In Q
PT ET
TOF_instance