Omron 3G8F7-CRM21 User Manual page 18

Application Precautions
xviii
• 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.
• Configure the control circuits so that the power to the PC (near the
CompoNet Master Board) will be on after the power to the I/O Slave Units.
If the PC power supply is turned on first, normal operation will not be
ensured, even temporarily.
• Use the Boards within the communications distance and the number of
connectable Units as defined in the specifications.
• Do not attempt to disassemble, repair or modify any Units. Any attempt to
do so may result in a malfunction, fire or electric shock.
• When installing the Unit, ground to 100 Ω/min.
• Be certain all screws to fix the Board to the PC, as well as the screws on
connectors, cables and terminal blocks, are tightened to the torque
specified in the corresponding manuals. Incorrect tightening torque may
result in a malfunction.
• Be sure the Board on the PC is securely mounted.
• All installation and wiring must observe the instructions in this manual.
• Use correct wiring tools and components for wiring.
• Confirm the orientation and polarity before connecting the terminal blocks
or connectors.
• Do not supply electricity while a terminal block cover is open.
• Confirm voltage specifications before wiring the communications lines,
the power supplies or the I/O circuits. Incorrect specification may result in
a malfunction.
• Install external breakers and take other safety measures against short-
circuiting in the external wiring. Insufficient safety measures against
short-circuiting may result in burning.
• Use crimp terminals for wiring. Do not connect bare stranded wires
directly to terminals. The connection of bare stranded wires may result in
burning.
• Double-check all wiring and switch settings before turning ON the power
supply. Incorrect wiring may result in burning.
• Be sure no waste metal enters the PC during the installation and wiring
work.
• Be certain the terminal blocks, connectors, expansion cables,
communications cables and other items with locking devices are properly
locked in place. Improper locking may result in a malfunction.
• Always use the power-supply voltages specified in the operation manual.
A malfunction or burning may occur as the result of incorrect voltage.
• Take appropriate measures to ensure that the specified power with the
rated voltage and frequency is supplied. Be particularly careful in places
where the power supply is unstable. An incorrect power supply may result
in a malfunction.
• Check the user program for proper execution before actually running it on
the Unit. The failure to check the program may result in unexpected
operation.
• Always turn OFF the power supply to the personal computer, the Slave
Units and communications before attempting any of the following. The
failure to turn OFF the power supply may result in a malfunction or electric
shock.
5