Main Processor Module 33
Chapter 3 System Description
Main Processor Module Specifications
Application Processor
Feature Specification
SX Processor Motorola MPC860, 32-bit, 50 MHz
Flash PROM 6 MB used for SX, IOX, and control application
storage
CRC-protected
DRAM 16 MB used for SX control application execution
and program and SOE data
Byte parity
NVRAM 8 KB, used for retentive variables
CRC-protected
Clock calendar
Accuracy during power on 1 sec/day typical
2.2 sec/day maximum
Accuracy during power off, with
battery backed up
2.2 sec/day typical
9.2 sec/day maximum
Battery ½ AA lithium, 15-year predicted life
TriBus 25 Mbps
CRC-protected
32-bit + parity DMA
TriStation port 1 10BaseT Ethernet connector
RJ-45 shielded connector on baseplate
Modbus port 1 RS-232/485 DTE
DB-9-pin shielded connector on baseplate
Debug port Used to access diagnostic information
RJ-12 connector located on baseplate, shared
with IOX debug port
Communication bus RS-485 2 Mbps HDLC
Alarm contacts Redundant, normally closed
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