Omron CJ1W-CT021 Operation Manual page 18

Application Precautions
!Caution
xviii
• Install the Units properly as specified in the operation manuals. Improper
installation of the Units may result in malfunction.
• Be sure that all the mounting screws, terminal screws, and cable connector
screws are tightened to the torque specified in the relevant manuals. Incorrect
tightening torque may result in malfunction.
• Leave the label attached to the Unit when wiring. Removing the label may result
in malfunction if foreign matter enters the Unit.
• Remove the label after the completion of wiring to ensure proper heat dissipa-
tion. Leaving the label attached may result in malfunction.
• Use crimp terminals for wiring. Do not connect bare stranded wires directly to
terminals. Connection of bare stranded wires may result in burning.
• Double-check all the wiring and the connectors before turning ON the power
supply. Incorrect wiring or bad connections may result in burning or malfunc-
tion.
• Be sure that the terminal blocks, Memory Units, expansion cables, and other
items with locking devices are properly locked into place. Improper locking may
result in malfunction.
• Check switch settings, the contents of the DM Area, and other preparations
before starting operation. Starting operation without the proper settings or data
may result in an unexpected operation.
• Check the user program for proper execution before actually running it on the
Unit. Not checking the program may result in an unexpected operation.
• Confirm that no adverse effect will occur in the system before attempting any of
the following. Not doing so may result in an unexpected operation.
• Changing the operating mode of the PLC.
• Force-setting/force-resetting any bit in memory.
• Changing the present value of any word or any set value in memory.
• Do not pull on the cables or bend the cables beyond their natural limit. Doing
either of these may break the cables.
• Do not place objects on top of the cables or other wiring lines. Doing so may
break the cables.
• 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.
• Before touching a Unit, be sure to first touch a grounded metallic object in order
to discharge any static built-up. Not doing so may result in malfunction or dam-
age.
• Do not touch circuit boards or the components mounted to them with your bare
hands. There are sharp leads and other parts on the boards that may cause
injury if handled improperly.
• Provide proper shielding when installing in the following locations:
• Locations subject to static electricity or other sources of noise.
• Locations subject to strong electromagnetic fields.
• Locations subject to possible exposure to radiation.
• Locations near power supply lines.
• Do not attempt to take any Units apart, to repair any Units, or to modify any
Units in any way.
• After connecting Power Supply Units, CPU Units, I/O Units, Special I/O Units,
or CPU Bus Units together, secure the Units by sliding the sliders at the top and
bottom of the Units until they click into place. Correct operation may not be pos-
sible if the Units are not securely properly. Be sure to attach the end cover pro-
vided with the CPU Unit to the rightmost Unit. CJ-series PLCs will not operate
properly if the end cover is not attached.
5