Omron C200HX Operation Manual page 48

IR (Internal Relay) Area
Output Bit Usage
Word Allocation for Racks
←
Rack Slot 1
CPU IR 000
st
1 Expansion IR 010
nd
2 Expansion IR 020
rd
3 Expansion IR 300
Unused Words
Allocation for Special I/O
Units and Slave Racks
30
instructions that control bit status, e.g., the OUTPUT, DIFFERENTIATION UP,
and KEEP instructions.
Output bits are used to output program execution results and can be used in any
order in programming. Because outputs are refreshed only once during each
cycle (i.e., once each time the program is executed), any output bit can be used
in only one instruction that controls its status, including OUT, KEEP(11),
DIFU(13), DIFD(14) and SFT(10). If an output bit is used in more than one such
instruction, only the status determined by the last instruction will actually be out-
put from the PC.
See 5-15-1 Shift Register – SFT(10) for an example that uses an output bit in two
'bit-control' instructions.
I/O words are allocated to the CPU Rack and Expansion I/O Racks by slot posi-
tion. One I/O word is allocated to each slot, as shown in the following table. Since
each slot is allocated only one I/O word, a 3-slot rack uses only the first 3 words,
a 5-slot rack uses only the first 5 words, and an 8-slot rack uses only the first 8
words. Words that are allocated to unused or nonexistent slots are available as
work words.
Left side of rack
Slot 2 Slot 3 Slot 4
IR 001 IR 002 IR 003
IR 011 IR 012 IR 013
IR 021 IR 022 IR 023
IR 301 IR 302 IR 303
Any words allocated to a Unit that does not use them can be used in program-
ming as work words and bits. Units that do not used the words assigned to the
slot they are mounted to include Link Units (e.g., Host Link Units, PC Link Units,
SYSMAC NET Link Units, etc.), Remote I/O Master Units, Special I/O Units,
Group-2 High-density I/O Units, B7A Interface Units, and Auxiliary Power Sup-
ply Units.
In most C200HX/HG/HE PCs, up to sixteen Special I/O Units may be mounted in
any slot of the CPU Rack or Expansion I/O Racks. (A limited number of Special
I/O Units can be installed in Remote I/O Slave Racks, too.) Each Special I/O Unit
is allocated ten words based on its unit number (0 to F).
Up to ten Special I/O Units may be mounted in the C200HE-CPUjj-E and
C200HG/HX-CPU3j-E/4j-E PCs. Each Unit is allocated ten words based on
its unit number (0 to 9).
Unit number I/O words
0 IR 100 to IR 109
1 IR 110 to IR 119
2 IR 120 to IR 129
3 IR 130 to IR 139
4 IR 140 to IR 149
5 IR 150 to IR 159
6 IR 160 to IR 169
7 IR 170 to IR 179
8 IR 180 to IR 189
9 IR 190 to IR 199
Slot 5 Slot 6 Slot 7
IR 004 IR 005 IR 006
IR 014 IR 015 IR 016
IR 024 IR 025 IR 026
IR 304 IR 305 IR 306
PC Restrictions
None
Section 3-3
Right side of a 10-slot rack
Slot 8 Slot 9 Slot 10
IR 007 IR 008 IR 009
IR 017 IR 018 IR 019
IR 027 IR 028 IR 029
IR 307 IR 308 IR 309
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