Model PDP Series 200 maxDPU4F Hardware Guide
Metso Automation
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278705
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1-2
Distributed Processing Unit Hardware
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.
Control Processor
The DPU is comprised of a single printed circuit board that contains a
Pentium class Control Processor and a dedicated micro-controller for
scanning I/O. There are also sockets on the board for 64 Mbytes of
CompactFlash and 128 Mbytes of DRAM.
Performance
A multi-speed processing system is built into the maxDPU4F, which allows
objects to be executed in three different time classes. From as fast as 10 msec
to 1/2 second. Up to 8,500 control objects (Function Blocks)can be executed
in the DPU. Note also that Function Blocks can be combined to create
libraries of Standard and Custom Blocks. A Function Block can be as small
as an Atomic Block, such as an AND or OR gate.
A data point management system (DPMS) keeps track of the object size and
the total execution time for each time class.
I/O Bus Interface
A Motorola 68332 32-bit I/O processor and field programmable gate array
(FPGA) are used to interface to both the Model IOP I/O bus and to the I/O
Bus Expander Module (BEM) for remote I/O applications. Up to 60 Model
IOP I/O modules can reside on each electrical bus. See Publication 278596,
maxPAC Hardware Reference Guide
, and for earlier Model 564 I/O, see
278563,
Model IOP I/O System Installation and Preparation
. The maximum
length of the Model 564 I/O bus is 30 ft. The length of the remote I/O link
with fiber optic extenders is up to 2000 m.
Fully Self Describing Object Oriented Database
All information regarding the operation of the DPU is kept in DPU memory,
including: tag names, descriptions, tuning constants, alarm limits, etc. In
addition, all graphical configuration data (sheet number, object location,
wiring) is stored in the DPU.
This means that there is no possibility that the configuration observed is
different than that which is installed in the DPU.
Summary of Contents for PDP 400 maxDPU4F Series
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