ABB REO 517, Applications Manual, Page: 423 / 440

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Main processing module (MPM)
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The terminal is based on a pipelined multi-processor design. The 32-bit main controller
receives the result from the Signal processing module every millisecond.
All memory management are also handled by the main controller. The module has 8MB
of disc memory and 1MB of code memory. It also has 8MB of dynamic memory.
The controller also serves four serial links: one high-speed CAN bus for Input/Output
modules and three serial links for different types of HMI communication.
The main controller makes all decisions, based on the information from the Signal pro-
cessing module and from the binary inputs. The decisions are sent to the different output
modules and to these communication ports:
• Local HMI module including a front-connected PC, if any, for local human-ma-
chine communication.
• LON communication port at the rear (option).
• SPA/IEC communication port at the rear (option)