GE D20, Технический обзор

Страница: 60 / 107

D20/D200 Technical Overview
GE Grid Solutions
52
PRPI-019-3.00-10 GE Information
•
Communication Interface with D20ME consists of data control and formatting functions
that are called by common code using application interface tables. The formatting functions
place the requested data into an addressed buffer.
•
Maintenance Interface implements several maintenance and diagnostic commands.
2.4.7.4 D20A Specifications
Table 10 D20A Specifications
Item Description
Processor 8-bit Freescale 68HC11 MPU
Clock 2 MHz MPU clock
Memory
•
32 KB EPROM
•
24 KB static RAM
•
512 bytes EEPROM
Inputs 32 differential inputs (typical):
•
±5, ±10 V
•
±1, ±2.5, ±5, ±10, ±20 mA
Input Impedance 44 Mohm ±5% (VDC)
Overall Accuracy ±0.05% (voltage), ±0.1% (current)
Temperature Coefficient ±10 ppm per °C
Resolution 12-bit plus sign
Conversion Rate (all 32 inputs)
•
550 ms @ 60 Hz
•
656 ms @ 50 Hz
Over voltage Rating 35 VDC
Overload Rating 200 V pp ±5 V input common mode (50/60 Hz)
Common Mode Rejection (60 Hz)
•
95 dB 5 V
•
90 dB 10 V
Normal Mode Rejection (60 Hz) 60 dB
Component Isolation Rating 1500 Vrms
Dielectric Rating 1000 VDC
D.20 Link Ports 2
Maintenance Port 9600 baud, RS-232
Power Requirements 20-60 VDC, 7 W typical
Size 19" x 5.25" x 2.5"
LED Indicators
•
Common LEDs, described in Section 2.2.1 , Hardware.
•
RED binary point LEDs, indicating the analog point that is
currently being read.