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Expanded System Configuration Section 2-5
2-4-3 CJ-series CPU Bus Units
Note 1. Slave I/O are allocated in DeviceNet Area (CIO 3200 to CIO 3799).
2. Some CJ-series CPU Bus Units are allocated words in the CPU Bus Unit
Setting Area. The system must be designed so that the number of words
allocated in the CPU Bus Unit Setting Area does not exceed its capacity.
Refer to 2-7 CPU Bus Unit Setting Area Capacity for details.
2-5 Expanded System Configuration
2-5-1 Serial Communications System
The CJ-series system configuration can be expanded by using the following
serial communications ports.
• CPU Unit built-in ports
× 2 (peripheral port and RS-232C port)
• Serial Communications Unit ports
× 2 (RS-232C and RS-422A/485)
Name Specifications Model Number
of words
allocated
(CIO 1500 to
CIO 1899)
Mountable Racks Unit No.
CJ-series
CPU Rack
CJ-series
Expansion
Racks
Controller Link Units Wired CJ1W-CLK21-V1 25 words Yes Yes 0 to F
(4 Units
max.)
Serial Communications
Unit
One RS-232C port and
one RS-422A/485 port
CJ1W-SCU41 25 words Yes Yes 0 to F
Two RS-232C ports CJ1W-SCU21
Ethernet Unit 10Base-T, FINS com-
munications, socket ser-
vice, FTP server, and
mail communications
CJ1W-ETN11 25 words Yes Yes 0 to F
(4 Units
max.)
100Base-TX CJ1W-ETN21
DeviceNet Unit DeviceNet remote I/O,
2,048 points; Both Mas-
ter and Slave functions,
Automatic allocation
possible without Config-
urator
CJ1W-DRM21 25 words
(See note 1.)
Yes Yes 0 to F
PROFIBUS-DP Master
Unit
PROFIBUS-DP remote
I/O, 7,168 words
CJ1W-PRM21 25 words Yes Yes 0 to F
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