Omron CJ2 User Manual

5 Installation
5-36
CJ2 CPU Unit Hardware User’s Manual
Observe the following precautions when using the CJ2 CPU Unit built-in EtherNet/IP port.
z Basic Installation Precautions
• Take the greatest care when installing the Ethernet System, being sure to follow ISO 8802-3 spec-
ifications. You must obtain a copy of these specifications and be sure you understand them before
attempting to install an Ethernet System.
• Unless you are already experienced in installing communications systems, we strongly recom-
mend that you employ a professional to install your system.
• Do not install Ethernet equipment near sources of noise. If a noisy environment is unavoidable,
take adequate measures against noise interference, such as installing network components in
grounded metal cases or using optical cable in the system.
• When installing an EtherNet/IP network that combines an information system with the control sys-
tem, and the communications load may be heavy due to tag data links, we recommend configur-
ing the network so that the load does not affect communications. For example, install the tag data
links in a segment that is separate from the information network.
z Precautions on Laying Twisted-pair Cable
• Noise resistance may be reduced by ground loops, which can occur due to improper shield con-
nections and grounding. Ground the shield at one location, as shown in the following diagram.
• Do not connect the connector shield at the CPU Unit.
• If a cable connects two hubs, connect the shields at only one end.
• Press the cable connector in firmly until it locks into place at both the switching hub and the CPU
Unit.
• Do not lay the twisted-pair cable together with high-voltage lines.
• Do not lay the twisted-pair cable near devices that generate noise.
• Do not lay the twisted-pair cable in locations subject to high temperatures or high humidity.
• Do not lay the twisted-pair cable in locations subject to excessive dirt and dust or to oil mist or
other contaminants.
5-3-6 Wiring with Ethernet Cable
Precautions
Hub Hub
Connector Connector Connector
Connector
Connector Connector
GR GR
Connect shield.
Do not connect shield.
STP
(Shield)
STP
(Shield)
STP
(Shield)
EIP
Unit
Power
Supply
Unit
GR
terminal
Connector
EIP
Unit
Power
Supply
Unit
GR
terminal

Omron CJ2 Specifications

General

Model	CJ2
Manufacturer	Omron
Type	Programmable Logic Controller (PLC)
CPU Units	Multiple models available (e.g., CJ2M, CJ2H)
Number of I/O Points	Up to 2, 560 points
Communication Ports	Ethernet/IP, EtherCAT, USB, Serial
Expansion	Yes, via I/O Units and Special I/O Units
I/O Control Method	Cyclic Scan, Interrupt
Programming Language	Ladder diagram, structured text, function block diagram, sequential function chart, instruction list
Built-in I/O	Available on some models (e.g., CJ2M)
Ethernet Port	Yes, 1 port (depending on CPU Unit)
Serial Ports	RS-232C, RS-422/485 (configurable)
USB Port	Yes (for programming and monitoring)
Operating Temperature	0°C to 55°C
Storage Temperature	-25 to 70°C
Humidity	10 to 95% RH (non-condensing)
Vibration Resistance	10 to 57 Hz, Amplitude: 0.075 mm, 57 to 150 Hz, Acceleration: 1 G, X, Y, and Z directions, 80 min each
Power Supply Voltage	24 VDC or 100 to 240 VAC (depending on CPU Unit)