Adaptec 1542B - AHA Storage Controller Fast SCSI 10 MBps Specifikace stáhnout pdf (Strana 7)

Chapter 1

Introduction

Distributed Processing Unit Functionality

The Model PDP Distributed Processing Unit (maxDPU4E), which runs under

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

processing engine of the maxDNA distributed control system. The

maxDPU4E performs primary data acquisition, control, and data processing

functions.

The maxDPU4E, also known in this document as the DPU, is a self-

contained microprocessor-based, rack-mounted unit, which occupies either a

single slot in a Remote Processing Unit cabinet using a 4-wide backplane or

two slots when using a 6-wide or 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.

The maxDPU4E is a station on maxNET and it 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.

Distributed Processing Unit Hardware

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

(CP) and Input/Output Processor (IOP) attached to a DPU chassis. The

DPU’s front panel contains status LEDs, and takeover and reset buttons,

while the DPU’s front chassis panel contains network, backup and serial port

connectors, mode and network address switches, and the key switch. See

"Locating Front Panel and Chassis Controls and Features," later in this

chapter.

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Adaptec 1542B - AHA Storage Controller Fast SCSI 10 MBps Specifikace Strana 7