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D20/D200 Technical Overview
2.2 Main Processor
D20ME and D20ME II, which are the main processors for the D20/D200, act as master
controllers over D20 peripheral I/O modules, which serve as slaves. The main processors
function as data concentrators and central processors of field data. The D20 I/O peripheral
modules perform the primary processing of data, which increases the speed and efficiency of the
D20, by reducing the workload on the main processor.
Note:
In the following sections, references to the D20ME apply also to the D20ME II,
unless explicitly stated.
2.2.1 Hardware
The D20ME is an advanced, single board, VME-bus-compatible central processing unit. It uses a
real-time multi-tasking operating system that supports all standard SCADA/EMS related
functions and advanced custom applications. It features high-speed CMOS logic devices that
ensure low power consumption, noise immunity and reliability.
CPU/CONTROL
Data Address and
MEMORY
30
Control Buses
Figure 19 D20ME Block Diagram
PRPI-019-3.00-10
2 D.20 HDLC Ports
SERIAL
7 RS-232 Ports
I/O
Wesmaint Port
Local Interrupts
INTERRUPT
CONTROL
VME Interrupts
VME BUS
VME Bus
INTERFACE
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