Omron CJ2 User Manual page 163

• To avoid overheating the conduits when using conduits for wiring, do not place wires for a single
circuit in separate conduits.
• Power cables and signal cables adversely affect each other. Do not wire them in parallel.
• Noise induction may occur if the PLC is installed in a panel that includes high-voltage devices.
Whenever possible, wire and install them separately. (Refer to PLC Installation Location on page
42.)
• Either install the PLC a minimum of 200 mm from high-voltage lines or power lines, or place the
high-voltage lines or power lines in metal tubing and completely ground the metal tubing to 100 Ω
or less.
Other Precautions
• Basic I/O Units have both plus and minus commons, so pay attention to the polarity when wiring.
• Optical fiber cable looks like ordinary communications cable or power cable, but internally it con-
sists of fibers, tension members, other protective materials. It must be handled with care. In partic-
ular, optical fiber cable must be installed according to prescribed methods and standards. Do not
subject optical fiber cable to severe tensile shock, excessive bending, twisting, or excessive con-
striction. For details on wiring optical fiber cables, refer to the following manuals.
• SYSMAC H-PCF Optical Fiber Cables Installation Guide (Cat. No. W156)
• Optical Ring Controller Link Units Operation Manual (Cat. No. W370)
CJ2 CPU Unit Hardware User's Manual
Power supply
Incorrect
Power supply
Correct
Power supply
Correct
Parallel Wiring (Single Phase)
Panel with power line
Power line
Power line
200 mm
PLC
200 mm
Example: Separating PLC from Power Lines
Load
Load
Load
Metal tubing
PLC
Ground of 100 Ω or less
5 Installation
5
5-45