Area Allocations - Omron CS1W-MCH71 Operation Manual

Nomenclature and Functions
!Caution Please check if the power is OFF when you start the settings.
DIP Switch on the Back
Panel of the Unit
←
Note
3-1-2

Area Allocations

Word Allocations Using
Unit Numbers
CPU Bus Unit Allocated
Bit Area
The rotary switch located on the forehead of MC Unit can set the unit num-
bers.
(Examples)
Unit Number: 6
The maximum of 16 MC Units can be mounted to one CS-series PLC, and a
maximum of 12 MC Units can be mounted to one CJ-series PLC.
With a CJ-series PLC, up to 10 CPU Bus Units can normally be connected in
the CPU Rack or in each Expansion Rack. Each CJ1W-MCH71 MC Unit,
however, requires the space of three standard Units. Therefore, a maximum of
only 3 MC Units plus one other CPU Bus Unit can be mounted per Rack.
The same unit number cannot be used twice in one PLC.
These switches are inside the case and are used for special purposes like
shipping inspection mode, etc. Therefore, do not operate them.
1 2
OFF OFF Normal operation
ON OFF Reserved for shipping inspection by OMRON (Do not set.)
OFF ON Reserved for shipping inspection by OMRON (Do not set.)
ON ON Reserved for shipping inspection by OMRON (Do not set.) (See
note.)
If the power is turned ON under this setting, the MC Unit will be started after
various user settings are set beck to their factory default values.
The bit and DM areas used by the MC Unit are allocated based on the unit
number.
The bit area is allocated 25 words for each unit number starting from the word
1500.
Unit number Bit area
0 Words 1500-1524
1 Words 1525-1549
2 Words 1550-1574
3 Words 1575-1599
4 Words 1600-1624
5 Words 1625-1649
6 Words 1650-1674
7 Words 1675-1699
Unit Number: 12 (Hexadecimal)
Status
Unit number Bit area
8 Words 1700-1724
9 Words 1725-1749
10 Words 1750-1774
11 Words 1775-1799
12 Words 1800-1824
13 Words 1825-1849
14 Words 1850-1874
15 Words 1875-1899
Section 3-1
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