Storage Elements¶
Lithium Battery
AC500 processor modules are supplied without a lithium battery. It must therefore be ordered separately. The TA541 lithium battery is used to save SRAM contents of processor modules (PM595-4ETH-F only) and back up the real-time clock in case of power failures. Even if the processor modules can work without a battery, its use is still recommended in order to prevent process data being lost in case of power failures (PM595-4ETH-F only).
The processor module monitors the battery’s state of charge. If the processor module signals a low state of charge (via the diagnostic system and LED), the battery has to be replaced immediately.
For technical data, handling instructions and a description of the insertion/replacement of the battery, please refer to the chapter TA541 Lithium Battery TA541 - Lithium Battery.
Note
The processor module PM595-4ETH-M-XC is maintenance-free. The lithium battery TA541 in this processor module type is used only for back-up of the real-time clock (RTC) in case of no power supply. If the RTC is not used, there is no need to install a TA541 lithium battery.
Memory Card
AC500 processor modules are supplied without memory card. It must be ordered separately.
The memory card can be used
- to read and write user files
- for firmware updates
Detailed information can be found in the System Technology chapter: System Processing
AC500 processor modules can be operated with and without memory cards. The processor module uses a standard file system (FAT; filenames stored in 8.3 format, on memory card). This allows standard card readers to read and write the memory cards (MC502).
Note
Only genuine MC502 memory cards are supported.
For more information on the technical data, handling instructions and the insertion/replacement of the memory card, please refer to the chapter Memory Card MC502: MC502 - SD Memory Card