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Unit Numbers and I/O Word Allocation Section 3-2
G72C Remote Terminal
Power
supply
12 or 24 VDC
I/O
devices
I/O
interface
Trans-
mission
interface
CPU
System
ROM
I/O
interface
Indicators
DIP
switch
Work
RAM
Relay
output
RUN output
RS-485
interface
Switches
DC-DC
converter
AL007-P Link Adapter
Code
converter
Electri-
cal-optical
converter
To
other AL-007
Link Adapter
+ –
5V
0V
Fuse
T
o Wired Remote I/O Unit
or Remote T
erminal
AC power supply
100 to 240 V
AC
LG
FG
Line and frame
grounds
3-2 Unit Numbers and I/O Word Allocation
Word allocations on Racks in Remote I/O Systems follow basically the same
pattern as the PC to which the Master is mounted, i.e., by the mounting order
of and by the number of words required for each Unit mounted for C120,
C500, C1000H, and C2000H Systems and by fixed slot words in C200H Sys-
tems.
Basic Allocation
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