5 Outline of Motion Control Systems
5.5.3 Setting and Changing the Scan Time
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5.5.3 Setting and Changing the Scan Time
( 1 ) Precautions When Setting or Changing the Scan Time
Scan time can be set or changed in the following window.
<When Using MPE720 Ver 6.
>
Scan Time Setting (Select
File
-
Environment Setting
-
Setup
-
Scan Time Setting
from the menu bar.)
<When Using MPE720 Ver 5.
>
Scan Time Setting (Double-click
Scan Time Setting
in the Definition Folder in the
File Manager
Window.)
Observe the following precautions when setting or changing the scan time.
• Set the set values of the scan time for both the high-speed (H) and low-speed (L) scans to at least the maximum time
required to execute the scans. We recommend setting the set values of the scan time using the formula (set value
−
maximum time to execute scan)
≥
(0.2
×
set values of the scan time), i.e., setting the set values of the scan time to at
least 1.25 times the maximum times required to execute the scans.
If the scan time is set too close to the maximum execution time for the scan, the refresh time for the screen on
the MPE720 will be very slow and communication timeouts may occur. If the maximum execution time exceeds
the scan time set value, a watchdog timer timeout error will occur and the MP2300 system will stop.
• Set the set values of the high-speed (H) and low-speed (L) scan time to an integral multiple of the
MECHATROLINK communication cycle (1 or 2 ms) set in the MP2300. Always check the set values of the scan
time after changing the MECHATROLINK communication cycle.
• Do not change the scan time set value while the Servo is ON. Never change the setting while the axis is moving
(while the motor is running). Otherwise an error may occur during motor operation (e.g., high-speed rotation).
• When the scan time is set or changed, be sure to save the data to flash memory.
