Application Precautions - Omron CJ1W-CTL41-E Operation Manuals

Application Precautions

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Application Precautions

!WARNING
!Caution
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Observe the following precautions when using the Counter Unit or the PLC.
Failure to comply with the following precautions could lead to serious or possibly
fatal injury. Always follow these precautions.
• Always ground the system with 100 Ω or less when installing the system, to
protect against electrical shock.
• Always turn OFF the power supply to the PLC before attempting any of the
following. Performing any of the following with the power supply turned ON
may lead to electrical shock
• Mounting or removing any Units (e.g., I/O Units, CPU Unit, etc.) or memory
cassettes.
• Assembling any devices or racks.
• Connecting or disconnecting any connectors, cables or wiring.
• Setting DIP switch or rotary switches.
Failure to comply with the following precautions could lead to faulty operation of
the PLC or the system, or could damage the PLC or PLC Units. Always follow
these precautions.
• Fail-safe measures must be taken by the customer to ensure safety in the
event of incorrect, missing, or abnormal signals caused by broken signal
lines, momentary power interruptions, or other causes.
• Interlock circuits, limit circuits, and similar safety measures in external cir-
cuits (i.e., not in the Programmable Controller) must be provided by the cus-
tomer.
• If the IOM Hold Bit is turned ON, the outputs from the PLC will not be turned
OFF and will maintain their previous status when the PLC is switched from
RUN or MONITOR mode to PROGRAM mode. Make sure that the external
loads will not produce dangerous conditions when this occurs. (When opera-
tion stops for a fatal error, including those produced with the FALS instruc-
tion, all outputs from Output Unit will be turned OFF and only the internal
output status will be maintained.)
• Use the Units only with the power supplies and voltages specified in the
operation manuals. Other power supplies and voltages may damage the
Units.
• Take appropriate measures to ensure that the specified power with the rated
voltage and frequency is supplied. Be particularly careful in places where the
power supply is unstable. An incorrect power supply may result in malfunc-
tion.
• Install external breakers and take other safety measures against short-cir-
cuiting in external wiring. Insufficient safety measures against short-circuiting
may result in burning.
• Do not apply voltages to Input sections in excess of the rated Input voltage.
Excess voltages may result in burning.
• Do not apply voltages or connect loads in excess of the maximum switching
capacity to output sections. Excess voltage or loads may result in burning.
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