YASKAWA JEPMC-MP2300-Y Series User Manual page 532

11 Precautions for Using the MP2300
11.2.3 Setting and Changing the Scan Time
11.2.3 Setting and Changing the Scan Time
( 1 ) Precautions When Setting or Changing the Scan Time
( 2 ) Scan Time Set Value Examples
11-8
Double-click the scan time file in the File Manager Window on the MPE720. Scan time settings or
changes can be performed from the Scan Time Window that is displayed.
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.
■ 0.8-ms Maximum Scan Time and 1-ms Communication Cycle (MECHATROLINK-II
Only)
High-speed (or low-speed) scan set value ≥ 1.25 × 0.8 (= 1 ms)
High-speed (or low-speed) scan set value = 1 ms, 2 ms, 3 ms, etc. (an integral multiple of at least 1
ms)
■ 1.4-ms Maximum Scan Time and 1-ms Communication Cycle (MECHATROLINK-II
Only)
High-speed (or low-speed) scan set value ≥ 1.25 × 1.4 (= 1.75 ms)
High-speed (or low-speed) scan set value = 2 ms, 3 ms, etc. (an integral multiple of at least 2 ms)