Omron CPM2C-S100C, Operation Manual, Page: 19 / 269

xix
Application Precautions 5
!Caution Failure to abide by the following precautions could lead to faulty operation of
the PC or the system, or could damage the PC or PC Units. Always heed
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.
• Emergency stop circuits, interlock circuits, limit circuits, and similar safety
measures must be provided in external control circuits.
• Construct a control circuit so that power supply for the I/O circuits does
not come ON before power supply for the Unit. If power supply for the I/O
circuits comes ON before power supply for the Unit, normal operation may
be temporarily interrupted.
• If the operating mode is changed from RUN or MONITOR mode to PRO-
GRAM mode, with the IOM Hold Bit ON, the output will hold the most
recent status. In such a case, ensure that the external load does not
exceed specifications. (If operation is stopped because of an operation
error (including FALS instructions), the values in the internal memory of
the CPU Unit will be saved, but the outputs will all turn OFF.)
• Install the CPM2C-S and Expansion I/O Units properly so that they will
not fall off.
• Be sure that the terminal blocks and other items with locking devices are
properly locked into place. Improper locking may result in malfunction.
• Be sure that terminal blocks and connectors are connected in the speci-
fied direction with the correct polarity. Not doing so may result in malfunc-
tion.
• Use the Unit with the battery housing cover in place to prevent dust or for-
eign matter from entering inside the Unit. Not doing so may result in mal-
function.
• Install the expansion I/O connector cover to the last Unit (Expansion Unit
or Expansion I/O Unit) to prevent dust or foreign matter from entering
inside the Unit. Not doing so may result in malfunction.
• Be sure to attach the labels supplied with the CPM2C-S or provide other
protective covers when wiring in order to prevent dust or wiring cuttings
from entering the Unit.
• Remove the label after the completion of wiring to ensure proper heat dis-
sipation. Leaving the label attached may result in malfunction.
• Use round crimp terminals for wiring the Power Supply Unit (CPM2C-
PA201). Do not connect bare stranded wires directly to terminals. Con-
nection of bare stranded wires may result in burning.
• Be sure to perform wiring in accordance with the CPM2C-S Operation
Manual. Incorrect wiring may result in burning.
• Do not apply voltages to the input terminals in excess of the rated input
voltage. Excess voltages may result in burning.
• Do not apply voltages or connect loads to the output terminals in excess
of the maximum switching capacity. Excess voltage or loads may result in
burning.
• Install external breakers and take other safety measures against short-cir-
cuiting in external wiring. Insufficient safety measures against short-cir-
cuiting may result in burning.
• Always use the power supply voltage specified in the operation manuals.
An incorrect voltage may result in malfunction or burning.