Allocating First Words To Racks - Omron SYSMAC CS Series Operation Manual

Allocating First Words to Racks

Example
1 2 3 4 5 6 7 8
Remote I/O Slave Rack
8-3

Allocating First Words to Racks

Word Allocations
392
The following example shows the word allocation to 3 Slave Racks.
SYSMAC BUS Remote I/O
Master Unit
19 20 21 22 23 24 25 26
Slave Unit with
unit number 0
1
2
3
Slave Unit with
:
unit number 0
8
Not used.
Not used.
9
10
:
Slave Unit with
16
unit number 1
17
18
19
20
:
Slave Unit with
unit number 2
26
Not used.
Not used.
CIO 3000 to CIO 3079 can be used as work words/bits when a SYSMAC BUS
System is not being used. Also, even if a SYSMAC BUS System is used,
words that are not allocated in the SYSMAC BUS System, such as CIO 3030
to CIO 3079 in the above example, can be used as work bits/words.
In the CS-series PLCs, the first word allocated to each Rack can be set with
the CX-Programmer's I/O table edit operation. For example, the CPU Rack
can be set to be allocated words starting with CIO 0000; the next Rack, words
starting with CIO 0100; the next Rack, words starting with CIO 0200; etc. This
can make it easier to check word allocations to Units without calculating all the
way from the CPU Rack.
Note The first words for Racks cannot be set at the same time as the first words for
slots.
For Racks in which the first word address has been set, words are allocated to
Units in the order that the Units are mounted (from left to right) beginning with
the specified first word. Words are not allocated to empty slots.
SYSMAC BUS Remote I/O
9 10 11 12 13 14 15 16 17 18
Slave Unit with
unit number 2
Section 8-3
Slave Unit with
unit number 1