Omron CS1D DUPLEX SYSTEM - 10-2009 Operation Manual page 266

I/O Allocation Methods
Allocations to CS-series Long-distance Expansion Racks
Reserving I/O Words for Expected Changes
230
Example for Single CPU System
The following example shows the I/O allocation to Basic I/O Units in the CPU
Rack and two CS-series Expansion Racks.
0 1
IN IN
16 32
CIO CIO CIO CIO
0000 0001
0002
0 1
IN IN
16 32
CIO CIO CIO CIO
0027
0028
0029
0 1
OUT OUT
32 16
CIO CIO CIO CIO
0045 0047
0046
Note Use the CX-Programmer's I/O table change operation to reserve a word for
the empty slot.
In configurations containing CS-series Long-distance Expansion Racks, up to
two series of CS-series Long-distance Expansion Racks can be included.
Words are automatically allocated to the Units mounted to the Racks in order
of rack number and slot in the same way as for other configurations. The CPU
Rack is rack 0, the CS-series Expansion Rack (if there is one) is Rack 1. Rack
numbers are then assigned in order to the Racks in series A of CS-series
Long-distance Expansion Racks and finally to the Racks in series B of CS-
series Long-distance Expansion Racks, to a maximum rack number of 7.
Although words are automatically allocated, the first word on each Rack can
be set.
Note 1. I/O words are not allocated to the I/O Control Units or I/O Interface Units.
2. No C200H Units of any kind can be mounted to CS-series Long-distance
Expansion Racks.
3. CS-series CPU Bus Units should always be placed on the CPU Rack or
CS-series Expansion Rack. Although they can be placed on CS-series
Long-distance Expansion Racks, doing so is not recommended because it
will increase the cycle time.
If the system configuration will be changed at a later date, changes to the pro-
gram can be minimized by reserving I/O words in advance for future Unit
changes or additions. To reserve I/O words, edit the I/O table with the CX-Pro-
grammer.
2 3 4 5 6 7
Re-
IN OUT OU OUT OUT IN
served
32 T 16 32 32 32 96
CIO CIO CIO CIO
0003 0005 32 0015 0017 0019 0021
to
0004 0016 0018 0020
0026
2 3 4 5 6 7
Re- Re-
OUT OUT OUT IN
served served
16 16 32 16 32 96
CIO CIO CIO CIO
0030 0031 0034
0032 0035 0037
to
0033 0036
0042
2 3 4 5 6 7
Re- Re- Re-
0000
IN IN OUT
served served served
CH
16 16 32 16 16 32
CIO CIO CIO CIO
0048 0049 0050 0050 0051 0052
0051 0053
Section 7-2
Single CPU System
CPU Rack
8
CS1D Expansion Rack
Re-
served
32
CIO
0043
0044
8
CS1D Expansion Rack
OUT
32
CIO
0054
0055