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Download QnUCPU User`s Manual (Function Explanation, Program
Transcript
CHAPTER5 MEMORIES AND FILES USED FOR CPU MODULE 5.3.2 Precautions for handling files 1 (1) Power-off or reset at file operation When the CPU module is powered off or reset at file operation, files in each memory are held (for a memory card, when the CPU module where a memory card has been mounted before power-off is powered on). 2 3 When the programmable controller is powered off during an operation in which a file is moved, the data in operation are held in the internal memory of the CPU module. The held data are recovered at power-on. To hold the internal memory data, battery backup is required. 4 5 (2) Concurrent writing from multiple GX Developers to one file GX Developers other than the one writing data to a file cannot access the file until the writing ends. Also, GX Developers other than the one accessing a file cannot write data to the file until the access ends. 6 Therefore, write data to one file from multiple GX Developers one by one. 7 (3) Concurrent access from multiple GX Developers to different files Except the currently viewed GX Developer, maximum 10 GX Developers can access to different files in one CPU module concurrently. 8 5.3 File Operations by GX Developer and Handling Precautions 5.3.2 Precautions for handling files 5 - 33
