Mitsubishi Electric MELSEC iQ-F FX5 - Page 63

4 DEVICES
4.2 User Devices
61
4
Precautions when using timers
Precautions when using timers are as follows.
• Do not specify the same timer coil (OUT T instruction) more than once per scan. If you do, the current value of the timer
is updated when each respective timer coil is executed, so measurement cannot be performed normally.
• When timer is not used for data collection for each scan: While the coil on a timer (e.g. T1) is turned on, the timer coil (the
OUT T instruction) cannot be skipped by the instructions such as the CJ. If a timer's coil is skipped, the timer's current
value is not updated, so measurement cannot be performed normally. In addition, when the timer exists in a subroutine
program, be sure to execute a subroutine call including T1 coil only once for each scanning operation while the coil of the
timer (e.g. T1) is turned on. If not executed, measurement cannot be performed normally.
• The timer cannot be used in the initial execution type program, fixed scan execution type program, or event execution type
program. The timer can be used in standby type programs if the coil of timer (OUT T instruction) is executed one time for
one scan using a subroutine program.
• The timer cannot be used in interrupt programs. The timer can be used in subroutine programs or FB programs if the coil of
timer (OUT T instruction) is executed one time for one scan.
• If setting value is "0": The output contact operates when the coil instruction of the next cycle is executed.
• If setting value is modified after time up: The timer remains in time up status and does not operate even if the setting value
is raised higher than the current value after time up.
Routine timer setting
The setting of the routine timer is made.
Navigation window  [Parameter]  [Module model name]  [CPU Parameter]  "Memory/Device Setting"  "Device/
Label Memory Area Setting"
Window
Displayed items
Item Description Setting range Default
To use or not to use the routine timer of timer (T) Whether the routine timer is used is set. • Not use
•Use
Not use
Start device No. of routine timer of timer (T) The initial device of the routine timer is set. ■FX5S/FX5U/FX5UC CPU module
• 0 to 511
■FX5U/FX5UC CPU module
• 0 to 1023
0