FAQ: In the MP940 controller, how are the FLASH and COPY switches used?
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When an MP940 program is executed, it runs from RAM memory, and variables (or registers) reside in RAM. Without a battery, this memory will naturally decay and lose information over time, so Yaskawa recommends that a battery is attached to the MP940 to maintain the data in RAM. An alternate method of preserving the program data and register data is to store it in the built-in flash memory of the amplifier. The entire contents of RAM can be saved to Flash using either MotionWorks or MotionWorks+. To retrieve the data from Flash, simply set the dip switches on the front of the MP940 unit.
Operation note:
Upon application of control power with ONLY the "RUN" switch on, the controller will use the program and registers that are currently resident in RAM. WIthout a battery, the RAM memory is subject to loss, and could result in an A.E0 or A.9F alarm. With the "Flash" switch on during power up, the program will be copied from Flash to RAM for runtime. With the "Copy" switch on, the variable (register) data will be copied from Flash to RAM for runtime.
Flash: The "flash" switch copies the ladder programs from Flash to RAM on power-up. The data registers, however, are not copied.
Copy: The "copy" switch copies the global variables ('M' registers) from Flash to RAM.
The values of these switches are checked during power-up, therefore power must be cycled after turning the switches ON. If the MP940 does not have a battery, both switches should be left on all the time. If variables (registers) are changed on a constant basis (such as from an HMI), and need to be retained, then a battery will be necessary.
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Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not supersede it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ. All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.
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