Omron CPM2C Operation Manual page 13

• Always turn OFF the power supply to the PC before attempting any of the fol-
lowing. Not turning OFF the power supply may result in malfunction or electric
shock.
• Assembling the Units.
• Connecting or disconnecting the Expansion I/O Units
• Connecting or wiring the cables.
• Connecting or disconnecting the connectors.
• Setting DIP switches.
• Replacing the battery
! 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 pre-
cautions.
• 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 tempo-
rarily interrupted.
• If the operating mode is changed from RUN or MONITOR mode to PROGRAM
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 instruc-
tions), the values in the internal memory of the CPU Unit will be saved, but the
outputs will all turn OFF.)
• For models with only the super-capacitor installed, the contents of the READ/
WRITE enable area of the DM area, HR area, AR area, and CNT data area
may be damaged if the power is turned OFF for a long time. To prevent such
damage, provide ladder program that will check AR 1314 in order to ensure
proper operation of the system.
• The life of relays largely varies depending on switching conditions. Be sure to
test operating conditions using actual Units and use the product within the spe-
cified number of switchings so as not to cause any performance problems. Us-
ing the product with performance problems may result in defective insulation
between circuits or burning of the relays.
• Install the Units properly so that they will not fall off.
• 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.
• 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.
• Be sure that terminal blocks and connectors are connected in the specified di-
rection with the correct polarity. Not doing so may result in malfunction.
• Use the Unit with the battery housing cover in place to prevent dust or foreign
matter from entering inside the Unit. Not doing so may result in malfunction.
• Install the Expansion I/O Unit connector cover to the last Expansion I/O Unit to
prevent dust or foreign matter from entering inside the Unit. Not doing so may
result in malfunction.
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