FAQ: How can the controller error “The PLC could not perform a warm start, so the PLC performed a cold start.” be avoided so that the retained variables are not reset?
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When a project has local retained variables, and only a boot project is downloaded to the controller (by using the More button in the project control dialog), the controller will display this error after it is rebooted. To avoid this, make all retained variables global, or when downloading, download both the project and the boot project by using the Download button in the project control dialog.
This is a known issue that will be fixed in a future release.
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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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