Hardware Architecture; Coprocessor Hardware Architecture; Figure 4: Hardware Architecture - GE MiCOM P40 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 4: Hardware architecture

2.1

COPROCESSOR HARDWARE ARCHITECTURE

Some products are equipped with a coprocessor board for extra computing power. There are several variants of
coprocessor board, depending on the required communication requirements. Some models do not need any
external communication inputs, some models need inputs for current differential functionality and some models
need an input for GPS time synchronisation.
32
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
P543i/P545i
Output relay contacts
Digital inputs
Power system currents
Power system voltages
RS485 communication
Time synchronisation
Ethernet communication
P54x1i-TM-EN-1