Signal Processing And Communication Module - Toshiba GRL100-701B Instruction Manual

3.1.3

Signal Processing and Communication Module

The signal processing and communication module (SPM) incorporates a signal processing
circuit and a communication control circuit. Figure 3.1.3.1 shows the block diagram. The
telecommunication control circuit is incorporated in the sub-module GCOM.
The signal processing circuit consists of an analog filter, multiplexer, analog to digital (A/D)
converter, main processing unit (MPU1) and memories (RAM and ROM), and executes all kinds
of processing including protection, measurement, recording and display.
The analog filter performs low-pass filtering for the corresponding current and voltage signals.
The A/D converter has a resolution of 16 bits and samples input signals at sampling frequencies
of 2400Hz (at 50Hz) and 2880Hz (at 60Hz).
The MPU1 carries out operations for the measuring elements and scheme logic operations for
protection, recording, displaying and signal transmission control. It implements 60 MIPS and
uses two RISC (Reduced Instruction Set Computer) type 32-bit microprocessors.
The telecommunication control circuit consists of MPU2 executing control processing of local
and received data, memories (RAM and ROM), parallel-to-serial and serial-to-parallel data
converter, and electrical-to-optical and optical-to-electrical converter.
The SPM can be provided with fibre optic interface, Ethernet LAN interface, RS232C etc. for
serial communication system.
Analog filter
Analog
input
Analog filter
Analog filter
GCOM
RAM
Multiplexer
A/D
converter
Figure 3.1.3.1 Signal Processing and Communication Module
 162 
ROM
MPU2 P/S E/O
S/P O/E
Fibre optic or
Ethernet LAN,
etc.
(Option)
MPU1
RAM ROM
6 F 2 S 0 8 5 0
Telecommuni-
cation system
Link with Serial
communication
system
GPS
O/E
Other
modules