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CJ2 Overview


Introducing the Flagship CJ2 CPU Units, with Built-in Multifunctional Ethernet Port.

Innovation without growing pains

As a modern machine manufacturer you need to continuously increase the intelligence and flexibility of your product to remain competitive. But you also need to be absolutely certain that it all works perfectly, first time, every time.
The CJ2 is the result of years of experience as market leader in the field of modular controllers and represents a logical next step in controller design. It offers greater performance and faster I/O response as well as extreme scalability - so you will only need one family. In addition, programming, debugging and networking are faster and easier.
Welcome to the new CJ2 Family: built to give you innovation without growing pains.

Although CJ2 is a can directly replace any CJ1 CPU, it offers the following additional significant advantages:

Open to the world

Data communication is via standard Ethernet port with EtherNet/IP Data Link function.

Advanced motion control

CJ2 units offer multi-axes synchronous control, and can replace expensive motion controllers.


Faster program execution and immediate I/O refreshing enables flexible machine control.

Learn one, know them all

Thanks to the wide variety of CPUs with consistent architecture across all PLC families, you only need to learn one, and you will know them all.

Highly flexible

Adapt the PLC to your needs with the wide variety of compatible CJ1 Family I/O units (nearly 100).

Inspired by proven technology

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Proved track record

The CJ2 Family is based on the highly popular CJ1, which after its launch in 2001 is operating in an extraordinary variety of applications all over the world. Now, as the natural successor, the CJ2 combines that field-proven technology with a wider choice of CPUs, more speed and memory, and a wider variety of communication interfaces.

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Faster development

Tag-based communications technology will simplify the interfacing of the PLC to the outside world. On-line debugging improvements also help to accelerate software development so you can change the code and test the results quickly. The added function block memory will allow you improve to program structure and reuse of code even in the the entry-level models.

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Talks to all

The CJ2 Family supports major open networking technologies including:
• Ethernet-based communication based on open industrial standards
• Serial communications over RS-232 C, RS-422, RS-485 and USB
• The major open Fieldbus standards
• Fast and accurate motion control networks.

Built to answer your needs

Omron has used its long experience as a specialist machine automation supplier to develop CJ2. The result is an extremely reliable PLC that is also a powerful example of our commitment to continuous improvement.
The CJ2 Family is a major opportunity to innovate and simultaneously reduce cost now and in the future.
It's the obvious choice for modern machine builders.

Wide range CPU capacity

To stay ahead in the machine-building business, you need to grow with your end-user’s needs. Faster production, better quality control and better traceability require more speed and more memory. That’s why the CJ2 Family offers a wide range of CPUsto suit any task. From 5 Ksteps program capacity and 64 Kwords memory, right up to 500 Ksteps capacity and 832 Kwords.

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Higher precision

In addition to the greater CPU processing performance, Omron has also added new high-speed I/O units, such as analog input units with 20 μs conversion time, while new PLC instructions provide immediate access to fast I/O data. The result is even more real-time reliability.

Easy connection by USB

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One family - two performance classes

CJ2M for basic machine automation

The CJ2M Series is ideal for packaging and general machine automation needs. Connectivity is assured thanks to the built-in USB port and the choice of Ethernet and RS-232C/422/485 interfaces on the CPU.

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Pulse I/O modules

By mounting optional pulse I/O modules, you can extend the functionality of any CJ2M CPU with:
- interrupt inputs
- quick-response inputs
- high-speed counters
- incremental encoder inputs
- pulse frequency control outputs
- pulse width control outputs

Up to two modules can be mounted per CPU, allowing direct control of four motion axes. Using dedicated instructions, these axes can be controlled directly by the PLC program, without communication delays.

* Supported by the CJ2M CPU Unit with version 2.0 or later.

CJ2H for high speed, high capacity

The CJ2H Series is ideal for advanced machine automation needs such as those required in image processing inspection of electrical components and high speed sorting on conveyors.

Advanced motion control - made simple

The CJ2H's advanced motion control avoids the use of expensive motion controllers. Synchronized control is possible on up to 20 axes by using just five Position Control units (High-speed type). And, programming is easy - simply paste an electronic cam function block into a synchronized interrupt task.

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