Omron SYSMAC CJ Series, Operation Manual

Page: 9 / 371

Application precautions 5
ix
• Locations subject to possible exposure to radioactivity.
• Locations close to power supplies.
!Caution
The operating environment of the PLC System can have a large effect on the longevity
and reliability of the system. Improper operating environments can lead to malfunction,
failure, and other unforeseeable problems with the PLC System. Be sure that the
operating environment is within the specified conditions at installation and remains
within the specified conditions during the life of the system.
5 Application precautions
!WARNING Do not start the system until you check that the axes are present and of the correct
type. The numbers of the axis will change if MECHATROLINK-II network errors occur
during start-up or if the MECHATROLINK-II network configuration changes.
!WARNING Check the user program for proper execution before actually running it in the Unit. Not
checking the program may result in an unexpected operation.
!WARNING Observe the following precautions when using the CJ1W-MCH72 or the PLC. Failure to
abide by the following precautions could lead to serious or possibly fatal injury. Always
heed these precautions.
• Always connect to a ground of 100
Ω
or less when installing the Units. Not
connecting to a ground of 100
Ω
or less may result in electric shock.
• Always turn OFF the power supply to the PLC before attempting any of the
following. Not turning OFF the power supply may result in malfunction or electric
shock.
-
Mounting or dismounting Power Supply Units, I/O Units, CPU Units, Memory
Cassettes, or any other Units.
- Assembling the Units.
- Setting DIP switches or rotary switches.
- Connecting cables or wiring the system.
- Connecting or disconnecting the connectors.
!Caution
Be sure that all mounting screws, terminal screws, and cable connector screws are
tightened to the torque specified in this manual. Incorrect tightening torque may result
in malfunction.
!Caution
Wire correctly. Incorrect wiring may result in burning.
!Caution
Mount the Unit only after checking the terminal block completely.
!Caution
Resume operation only after transferring to the new CJ1W-MCH72 Unit the contents of
the VR and table memory required for operation. Not doing so may result in an
unexpected operation.
!Caution
When replacing parts, be sure to confirm that the rating of a new part is correct. Not
doing so may result in malfunction or burning.
!Caution
Use the dedicated connecting cables specified in operation manuals to connect the
Units. Using commercially available RS-232C computer cables may cause failures in
external devices or the Unit.
!Caution
Outputs may remain on due to a malfunction in the built-in transistor outputs or other
internal circuits. As a countermeasure for such problems, external safety measures
must be provided to ensure the safety of the system.
!Caution
Failure to abide by the following precautions may lead to faulty operation of the PLC,
the CJ1W-MCH72 or the system, or could damage the PLC or CJ1W-MCH72. Always
heed these precautions.