Omron WIRED REMOTE I-O System Manual page 35

Block Diagrams
Remote Interface and I/O Blocks
Remote Interface
I/O
interface
DC-DC
converter
I/O Block
Power supply 12 or 24 VDC
24
Switches
System
CPU
ROM
RUN output
Relay interface
Protection
Indicators
circuit
Trans-
mission
interface
Work I/O
RAM interface
Relay DIP
Indicators
output switch
Section 3-1
RS-485
interface
I/O
devices