ABB Basic Unit PM 802F /PM 803F

eatures

Page 4 June 2006

Super Scalar RISC microprocessor (up to 150 MIPS)

16 K internal CPU cache RAM

RAM memory with error detection and correction

PM 802F: 4 MB static

PM 803F: 16 MB synchronous dynamic

Flash-EPROM

PM 802F: 4 MB, 32-bit words

PM 803F: 8 MB, 32- bit words

EEPROM, serial, 16 Kbit

Monitoring of the temperature inside the device

Watchdog

4 slots for fieldbus modules

2 slots for Ethernet communications modules, 32-bit data

bus, 100 MBytes/s

Battery backup incl. battery watchdog

Description

The basic unit, PM 802F and respectively PM803F, cyclically

scans signals from the fieldbus sensors via the corresponding

fieldbus modules, processes these signals according the appli

cation programs installed by the user and sends appropriate

signals to the fieldbus actuators via the fieldbus modules.

Controller redundancy can be achieved by installing two

AC 800F. To ensure quick and smooth takeover by the secon

dary AC 800F in case the primary AC 800F fails, a dedicated

redundancy communications link through the second Ethernet

module makes sure that both AC 800F are always synchro

nized. All inputs and outputs are designed to support redundant

operation.

Data communication between AC 800F, process and operator

stations runs over the Ethernet system bus on the first Ethernet

module. Data exchange with the engineering station is also car

ried via the system bus. Engineering station communications

can involve new or updated configuration files being

downloaded to the process stations, or information about the

connected modules being reported back. When fieldbus mod

ules are installed or exchanged, the required configuration in

formation is automatically updated.

Configuration and real-time process data is stored in RAM. To

safeguard this data in case of power loss, the RAM power is

backed up with batteries located either on the Ethernet modules

or on battery modules.

The PM 803F has more memory than the PM 802F and is

therefor capable to handle larger projects. Due to increased

memory size and different technology the buffering times were

reduced.