Omron CPM1A Operation Manual page 18

Application Precautions
• Do not apply voltages to the Input Units in excess of the rated input voltage.
Excess voltages may result in burning.
• Do not apply voltages or connect loads to the Output Units in excess of the
maximum switching capacity. Excess voltage or loads may result in burning.
• Disconnect the functional ground terminal when performing withstand voltage
tests. Not disconnecting the functional ground terminal may result in burning.
• Install the Unit properly as specified in the operation manual. Improper installa-
tion of the Unit 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.
• With version-1 CPU Units, leave the label attached wiring in order to prevent
wiring cuttings from entering in the Unit.
• With pre-version-1 CPU Units, be sure to attach the supplied labels when wir-
ing in order to prevent wiring cuttings from entering in 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 before turning on the power supply. Incorrect wir-
ing may result in burning.
• Be sure that the terminal blocks, expansion cables, and other items with lock-
ing devices are properly locked into place. Improper locking may result in mal-
function.
• 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 PC.
• Force-setting/force-resetting any bit in memory.
• Changing the present value of any word or any set value in memory.
• Resume operation only after transferring to the new CPU Unit the contents of
the DM and HR Areas required for resuming operation. Not doing so may result
in an unexpected operation.
• 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. 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 the 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
damage.
• Do not touch the Expansion I/O Unit Connecting Cable while the power is be-
ing supplied in order to prevent any malfunction due to static electricity.
• When using a thermocouple-input type Temperature Sensor Unit, observe the
following precautions:
• Do not remove the cold junction compensator attached at the time of deliv-
ery. If the cold junction compensator is removed the Unit will not be able to
measure temperatures correctly.
• Each of the input circuits is calibrated with the cold junction compensator
attached to the Unit. If the Unit is used with the cold junction compensator
from other Units, the Unit will not be able to measure temperatures correct-
ly.
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