Chapter 1; Introduction; Distributed Processing Unit Functionality; Distributed Processing Unit Hardware - Metso PDP Series Installation, Preparation And Adjustment

Chapter 1

Introduction

Distributed Processing Unit Functionality

The Model PDP Distributed Processing Unit (DPU) performs primary data
acquisition, control, and data processing functions for the maxDNA
Distributed Control System. The DPU is a self-contained microprocessor-
based, rack-mounted unit, which occupies a single slot in a Remote
Processing Unit cabinet. It is designed to operate with user-defined
combinations of maxDNA Model IOP Input/Output Modules, and to
communicate with other devices, such as Programmable Logic Controllers
and Remote Terminal Units.
As a station on the DPU Bus, the DPU scans and processes information for
use by other devices in the maxDNA system. Each DPU performs:
•Comprehensive alarming and calculations.
•Logging of Sequence of Events (SOE) data.
•Acquisition of trend information.
•Continuous scanning of Model IOP I/O modules.
•Execution of predefined Control and Data Blocks for process control and
data acquisition.
•Execution of user written programs using IEC1131-3 Toolset or Metso
Automation MAX Controls EXtended Control Engineering Language
(ExCEL).
•Ladder logic processing.
•Assurance of secure link-level data highway communications.

Distributed Processing Unit Hardware

A DPU consists of three circuit cards installed in a rack-mounted chassis.
The right front chassis panel contains two clockwise and counter-clockwise
connectors, two serial ports, 10 terminal blocks, and the DPU keylock.
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