Product Description:

The 2ME904.90-1 memory module is designed by B&R Automation for controllers in the System 2010 Controllers series. Installed as a pluggable unit, it provides dedicated storage for the operating system and user applications, ensuring that program data is retained when the main processor loses power. By combining writable RAM and nonvolatile memory in one cartridge, the module lets industrial automation systems restart with the correct logic and parameters after every shutdown and subsequent power-up.

It carries a replaceable lithium backup battery positioned behind a removable battery cover, and this cell maintains the contents of the static RAM when external power is absent. The nonvolatile store is a 1 MB EPROM array that protects stored system software from accidental erasure, while active variables reside in a bank of 512 KB SRAM for high-speed access during runtime and data updates. An onboard LED indicates programming status during write cycles, and a hardware switch locks the cartridge against unintended modifications. Its designated memory function is application memory, and the board is intended for a CPU or multiprocessor host module that must be inserted at the front of the processor frame.

For field servicing, the module is disengaged with a release lever that helps prevent undue flexing of the backplane connector. When removed, it retains the controller’s working variables because the RAM backup covers App RAM + CPU RAM. The software image stored inside includes the complete kernel as well as the user logic, and this content is identified as OS and app program. The handling directive is marked as power off only, which means installation and removal are performed with the supply disconnected to reduce risk to adjacent cards during handling.