What should I do if I can't start after 400cpu?

400h system, the two backup batteries on the CPU have no power has been alarm. After the external power supply is suddenly powered off, 1 pair of CPU and CP are all powered, stop running, and then the CPU restarts the Run light flashing behind, STOP instructions The light is on, and the CPU cannot start. After you ask you to learn, check the RAM memory card in 400CPU, check the documentation When you use the RAM memory card, if the power is faulty, the system must be able to use the backup battery or via the "ext.batt" socket to provide external standby to the CPU. Voltage, so that the data of the memory card and the data on the internal RAM are backup; since the rear back battery on the CPU has no electricity, after the external power is powered off, the program is lost on the RAM card. In the absence of any programs, the CPU is unable to start, you need to re-download the configuration and program, and the CPU can enter the operating state. Before downloading the CPU, you need to ensure that the CPU enters the STOP mode and can be accessed. 1, download hardware configuration After the hardware configuration is saved and compiled, then click the Download button, select "Download in STOP mode" option, select the downloaded target CPU (rack 0 or rack 1); Click "Update" in "Select Node Address" to find the physical address of the target CUP, click "OK", if the CPU does not assign an IP address, you need to assign one. You can also directly assign IPs directly through the PLC menu - "Edit Ethernet Node) 2, download the network configuration, at this time, you need to select the specified CPU station and download the entire site. 3, download the user program (CFC or SFC to compile after compiling) Completed the above steps, the CPU can complete the start. Note: We only need to download the primary CPU, and the alternate CPU automatically synchronizes the main CPU data through the synchronous fiber. Summary, this fault is because the CPU is powered down because the retrieval battery is not electrified, causing the program loss, and there is no program in the RAM card, so the CPU cannot be started. Editor in charge: YYX, read full text

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