METSO PDP401

A DPU consists of a printed circuit board containing the Control Processor 

and Input/Output Processor (IOP) and is installed in a maxPAC chassis. The 

DPU’s front panel contains status LEDs, a MODE Switch, Backup 

Connector, Network Connectors, and takeover and reset buttons. An 

optional assembly also contains a Serial Port Connector for interface to PLCs 

and a BNC Connector for interface to an IRIG-B time source. See "Front 

Panel Controls and Features," later in this chapter.

Description:

The Model PDP Distributed Processing Unit (DPU), which runs under the 

Windows CE.net real-time multitasking operating system, is the hardware 

processing engine of the maxDNA distributed control system. The DPU 

performs primary data acquisition, control, and data processing functions. 

The DPU, also known as maxDPU4F, is a self-contained microprocessorbased, rack-mounted unit, which occupies a single slot in a Remote 

Processing Unit cabinet using an 8-wide maxPAC backplane. 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 maxNET, 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 at 1 millisecond resolution. 

• Acquisition of trend information. 

• Continuous scanning of Model IOP I/O modules. 

• Execution of predefined algorithms, called Function Blocks, for process 

control and data acquisition.

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