14 Application Precautions
14.4.1 Saving User-defined Files or Data
14-16
14.4 Setting and Changing User-defined Files or Data
This section explains precautions when changing the scan times, Module configuration definition, or other set-
tings.
• Scan times: The cycles used to refresh all I/O, execute the ladder programs, etc.
• Module configuration definition: Settings for the Modules comprising the MP2100/MP2100M and func-
tions
14.4.1 Saving User-defined Files or Data
User-defined files and data must be saved in flash memory. Whenever setting or changing user-defined files, use
the MPE720 to save them to flash memory. If the files or data is not saved, the settings and changes will be lost
the next time the power supply to the MP2100/MP2100M is turned OFF.
14.4.2 Setting and Changing the Scan Times
Observe the following precautions when setting and changing the scan times.
• When setting the high-speed and low-speed scans, set them so that they are larger than the maximum exe-
cution times. Use the following equation as a guideline: (Scan setting
−
Max. execution time)
≥
(0.2
×
Scan setting) (20% or more of the setting) (Scan setting
≥
1.25
×
Max. execution time).
If a scan setting is close to the maximum execution time, refreshing the displays on the MPE720 will be
extremely slow and communication timeouts will occur. If the maximum execution time exceeds the scan
setting, a watchdog time out error will occur and the
MP2100/MP2100M
system will stop.
• Set the high-speed and low-speed scans to integral multiples of the MECHATROLINK communication
cycle of the CPU Module. If you change the MECHATROLINK communication cycle, be sure to check
the scan time settings.
• Never change the scan time settings when the Servo is ON, particularly when an axis is moving (i.e., when
the motor is running). Doing so may cause errors in motor rotation operations, such as high-speed rota-
tion.
• Always save any data that has been set or changed to flash memory.
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