Rockwell Automation 61C345 4 Input 4-20mA Analog Rail Module - Manual (Page 41)

BĆ1
Appendix B
Block Diagram
A/D CONTROL
ISOLA
TION
B OUNDARY
- + - + - + - + 4-20mA INPUT 4-20mA INPUT 4-20mA INPUT 4-20mA INPUT
VREF VREF VREF VREF
FIL
TER
SAMPLE/ HOLD
ANAL
OG
DIGIT
AL
CONVERTER
ISOLA
TED POWER
ISOLA
TED
ANAL
OG
POWER
AĆC AĆC D ĆC- D ĆC+
MUX
O
VER/UNDER
RANGE DETECT
CIRCUITRY
VREF
PRECISION VOL
TAGE REF VREF
MAIN
CONTROL CIRCUITRY
RESET
CIRCUITRY
ISOLA
TED CONTROL SIGNALS
POWER LED COMMUNICATION LED
PARALLEL
Ć
SERIAL REGISTER ISOLA
TED
CONTROL CIRCUITRY
S I G N A L S
D AT
A BUS
Vcc
HOST
INTERF
ACE
CIRCUITRY
SERIAL HOST INTERF
ACE
LOCAL HEAD OR RAIL MODE SWIT
CH
GND
12 PNT
.
HOST
CONNECTOR
FIL
TER
FIL
TER
FIL
TER