Mitsubishi Electric FX5 User Manual page 310

Current value and measurement range of timer
■Timer
The current value range is 0 to 32767.
Timer processing method
The timer's coil is turned ON/OFF, the current value is updated and the contact is turned ON/OFF when timer's coil (OUT T
instruction) is executed.
Details on timer operation and timer accuracy
A timer (T/ST) starts counting when a coil is driven, and its output contact turns on when the first coil instruction is executed
after the timer has reached timeout.
X10
K12
T0
T0
Y10
As shown in the above operation diagram, the accuracy of operation of the timer contact after the coil is driven until the
contact turns on is shown in the following outline:
T
 :0.001 sec (timer for 1 ms), 0.01 sec (timer for 10 ms) or 0.1 sec (timer for 100 ms)
+T
0
- T :Timer set value (sec )
T :Operation cycle (sec)
0
If the contact is programmed before the timer coil, "+2T0" is obtained in the worst case.
When the timer set value is "0", the output contact turns on when a coil instruction is executed in the next cycle.
The difference between a timer and a routine timer
Described below is the difference between a timer and a routine timer.
Item
Resolution
The timing of counting (count up)
The timing of time up (the operation at
the output contact)
Device
26 DEVICES
308
26.2 User Devices
Counting operation (If the operation cycle is long,
it automatically counts two or more clocks.)
X10 OFF→ON
Timer starts counting
1st cycle 2nd cycle
Timer
100 ms/10 ms /1 ms
When the OUT T instruction or the ANS instruction is
executed
When the OUT T instruction or the ANS instruction is
executed
T, ST
Contact is not
activated at this point
T0
Contact is
1.2 sec
activated
time-
out
Y10
ON
"n"th cycle "n+1"th cycle
Routine timer
100 ms
• When the OUT T instruction or the ANS instruction is
executed
• If the OUT T instruction or the ANS instruction is not
executed, the counting starts when the END instruction
is executed.
• When the OUT T instruction or the ANS instruction is
executed
• When the END instruction is executed
T