Precautions For Correct Use - Omron CJ Series Operation Manual

Precautions for Correct Use

Storage, Mounting, and Wiring
• Do not operate or store the Controller in the following locations. Operation may stop or malfunctions
may occur.
• Locations subject to direct sunlight
• Locations subject to temperatures or humidity outside the range specified in the specifications
• Locations subject to condensation as the result of severe changes in temperature
• Locations subject to corrosive or flammable gases
• Locations subject to dust (especially iron dust) or salts
• Locations subject to exposure to water, oil, or chemicals
• Locations subject to shock or vibration
• Take appropriate and sufficient countermeasures when installing the Controller in the following loca-
tions.
• Locations subject to strong, high-frequency noise
• Locations subject to static electricity or other forms of noise
• Locations subject to strong electromagnetic fields
• Locations subject to possible exposure to radioactivity
• Locations close to power lines
• Before touching a Unit, be sure to first touch a grounded metallic object in order to discharge any
static build-up.
• Install the Controller away from sources of heat and ensure proper ventilation. Not doing so may
result in malfunction, in operation stopping, or in burning.
• An I/O bus check error will occur and the Controller will stop if an I/O Connecting Cable's connector is
disconnected from the Rack. Be sure that the connectors are secure.
• Do not allow foreign matter to enter the openings in the Unit. Doing so may result in Unit burning,
electric shock, or failure.
• Do not allow wire clippings, shavings, or other foreign material to enter any Unit. Otherwise, Unit
burning, failure, or malfunction may occur. Cover the Units or take other suitable countermeasures,
especially during wiring work.
• For EtherCAT and EtherNet/IP, use the connection methods and cables that are specified in the NJ-
series CPU Unit Built-in EtherCAT Port User's Manual (Cat. No. W505) and the NJ-series CPU Unit
Built-in EtherNet/IP Port User's Manual (Cat. No. W506). Otherwise, communications may be faulty.
• Use the rated power supply voltage for the Power Supply Units. Take appropriate measures to
ensure that the specified power with the rated voltage and frequency is supplied in places where the
power supply is unstable.
• Make sure that the current capacity of the wire is sufficient. Otherwise, excessive heat may be gener-
ated. When cross-wiring terminals, the total current for all the terminals will flow in the wire. When
wiring cross-overs, make sure that the current capacity of each of the wires is not exceeded.
• Do not touch the terminals on the Power Supply Unit immediately after turning OFF the power supply.
Residual voltage may cause electrical shock.
• If you use reed switches for the input contacts for AC Input Units, use switches with a current capac-
ity of 1 A or greater.
If the capacity of the reed switches is too low, surge current may fuse the contacts.
28 CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)