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33
Nomenclature and Functions
Section 3-1
The rotary switch located on the forehead of MC Unit can set the unit num-
bers.
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.
!Caution
Please check if the power is OFF when you start the settings.
DIP Switch on the Back
Panel of the Unit
These switches are inside the case and are used for special purposes like
shipping inspection mode, etc. Therefore, do not operate them.
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.
3-1-2
Area Allocations
Word Allocations Using
Unit Numbers
The bit and DM areas used by the MC Unit are allocated based on the unit
number.
CPU Bus Unit Allocated
Bit Area
The bit area is allocated 25 words for each unit number starting from the word
1500.
(Examples)
Unit Number: 6
Unit Number: 12 (Hexadecimal)
1
2
Status
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.)
12
O
N
←
Unit number
Bit area
Unit number
Bit area
0
Words 1500-1524
8
Words 1700-1724
1
Words 1525-1549
9
Words 1725-1749
2
Words 1550-1574
10
Words 1750-1774
3
Words 1575-1599
11
Words 1775-1799
4
Words 1600-1624
12
Words 1800-1824
5
Words 1625-1649
13
Words 1825-1849
6
Words 1650-1674
14
Words 1850-1874
7
Words 1675-1699
15
Words 1875-1899
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