YOKOGAWA CW120 - Appendix; Appendix 1. Circuit Block Diagram

App 1-1
IM CW120-E
Circuit Block Diagram
App
Appendix 1. Circuit Block Diagram
Appendix
Flash
Memory
EEPROM
V1
Isolation Amplifier
A1
CH1 CH2
CH3
A2
ADC ADC
RTC
Keys
RS-485
Control
I/O
MPU
+
DSP
Range Amplifier
LPF
PC
LCD
Driver
Printer External Signal
Multiplexer
Voltage Input Block (Isolated)
Current Input Block
DC/DC
Backup
SRAM
PC Card
Controller
PC Card
V2
N V3
AC/DC Power Supply Block
A3
Vref
RS-232
Multidrop Connection
(Not provided for model with RS-485 interface)
Vcc
Vref
Segmented LCD
Only for CW121
Only for CW121
100–240 V AC
Zero-cross
Detector
Input Switching Signal Generator
Clock Signal Generator