The ABB PM583 processor module (1SAP340300R0271) packs 1 MB of memory and a 2048 kB memory size into a dedicated distributed automation PLC that carries Ethernet, two RS232/485 ports, a FBP interface, and a local display. It operates on a 24 V DC supply with a allowable range of 20.4 to 28.8 V DC and an ambient temperature span of -30 to +70 °C. The part is listed as Active, so it's a current production item with standard distribution-channel ordering.
The module is IP20-rated, meaning it lives inside a clean enclosure. It has no onboard digital I/O; all field I/O is handled through the backplane or the FBP network. If you're bringing in the RS232 or RS485 lines, bond the cable shield at the panel entry only — floating the field side keeps common-mode noise off the serial transceivers. The supply range is tight but typical for a 24 V DC control bus; expect a regulated PSU, not an unrectified AC trickle.