Hardware - GE D20 Technical Overview

D20/D200 Technical Overview

2.4.3 Hardware

D20 I/O peripherals consist of four distinct circuit blocks, as shown in Figure 27.
MCU CONTROL
20 - 60 VDC
POWER
SUPPLY
The fourth block, Input/Output, is specific to the function of the module. The circuit blocks are:
• MCU/Control: Performs data processing and storage, device addressing and system control.
Consists of an 8-bit microcontroller (MCU), address decoding, control signal generation,
clock generation, power monitor/reset, module ID and memory.
• Serial I/O: Consists of the D.20 communication and maintenance ports.
• Power Supply: Accepts an input voltage of 20 to 60 V DC, provided from either the host
D20 power supply or an external power source, and supplies a regulated output of +5 V and
+/-12 VDC.
• Input/Output: Controls and reads all digital or analog inputs, and controls and monitors all
digital outputs, as directed by the MCU.
40
Data Address and
Control Buses
+12 V
-12 V
+5 V
Figure 27 D20 Peripheral I/O Block Diagram
PRPI-019-3.00-10
D20 A
32 Analog Inputs
D20 S
64 Digital Inputs
I/O
D20 K
32 Control Outputs
D20C
16 Digital Inputs
8 Control Outputs
Optional:
16 Analog Inputs or
8 Analog Inputs and
8 Analog Outputs
Channel 1
SERIAL I/O
Channel 2
(backup)
Maintenance
Port
GE Grid Solutions
D.20 HDLC Ports
GE Information