Hardware Architecture; Figure 2: Hardware Architecture - GE MiCOM P747 Agile Technical Manual

Chapter 3 - Hardware Design
2

HARDWARE ARCHITECTURE

The main components comprising devices based on the Px4x platform are as follows:
● The housing, consisting of a front panel and connections at the rear
● The Main processor module consisting of the main CPU (Central Processing Unit), memory and an
interface to the front panel HMI (Human Machine Interface)
● A selection of plug-in boards and modules with presentation at the rear for the power supply,
communication functions, digital I/O, analogue inputs, and time synchronisation connectivity
All boards and modules are connected by a parallel data and address bus, which allows the processor
module to send and receive information to and from the other modules as required. There is also a separate
serial data bus for conveying sampled data from the input module to the CPU. These parallel and serial
databuses are shown as a single interconnection module in the following figure, which shows typical
modules and the flow of data between them.
Keypad
LCD
LEDs
Front port
Flash memory for settings
Battery-backed SRAM
Watchdog
contacts Watchdog module
+ LED
Auxiliary
Supply
Note: Not all modules are applicable to all products
V00233

Figure 2: Hardware architecture

26
Memory
for records
PSU module
Output relay boards
Opto-input boards
I/O
CTs
VTs
Analogue Inputs
RS485 modules
IRIG-B module
Ethernet modules
Communications
MiCOM P747
Output relay contacts
Digital inputs
Power system currents
Power system voltages
RS485 communication
Time synchronisation
Ethernet communication
P747-TM-EN-1
P747-TM-EN-1.1