Omron PROFINET NX-PNC202 User Manual page 20

Precautions for Safe Use
• Do not incline or twist the flat-blade screwdriver while it is in a release hole on a screwless clamping
terminal block. Doing so may damage the terminal block.
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Power Supply Design
• Use all Units within the IO power supply ranges that are given in the specifications.
• Supply sufficient power according to the contents of this manual.
• Use the power supply voltage that is specified in this manual.
• Do not apply voltages that exceed the rated value to any Input Unit.
• Do not apply voltages or connect loads to the Output Units or IO Devices in excess of the maximum
ratings.
• Inrush current occurs when the power supply is turned ON. When selecting fuses or breakers for
external circuits, consider their fusing and detection characteristics as well as the above precautions
and allow sufficient margin in shut-off performance.
• Install external breakers and take other safety measures against short-circuiting and overcurrents in
external wiring.
Turning ON the Power Supply
• When you set the Operating Mode at Startup, confirm that no adverse effect will occur in the system.
Actual Operation
• Before you start operation, always register the NX Units that are connected to the Communications
Coupler Unit in the host communications IO Controller as the Unit configuration information.
• Check the user program, data, and parameter settings for proper execution before you use them for
actual operation.
• If you change the fail-soft operation setting, the output status when the error occurs may also
change. Confirm safety before you change the fail-soft operation setting.
• If you use fail-soft operation, write programming to determine whether Unit IO data is valid. Without
such programming, the user program cannot distinguish between Units for which IO refreshing is
continued and Units for which IO refreshing is stopped.
Turning OFF the Power Supply
• Do not disconnect the cable or turn OFF the power supply to the Controller or an IO Device Terminal
when downloading data or the user program from the Sysmac Studio.
• Always turn OFF the external power supply to the Units before attempting any of the following.
Mounting or removing an NX Unit, Communications Coupler Unit, CPU Unit, or Industrial PC
Assembling Units
Setting DIP switches or rotary switches
Connecting or wiring cables
Attaching or removing terminal blocks or connectors
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NX-series PROFINET Coupler Unit User's Manual (W623)