xxi
Application Precautions
5
!Caution
Failure to observe 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.
• Fail-safe measures must be taken by the customer to ensure safety in the
event that outputs from Output Units remain ON as a result of internal cir-
cuit failures, which can occur in relays, transistors, and other elements.
• Always turn ON power to the PC before turning ON power to the control
system. If the PC power supply is turned ON after the control power sup-
ply, temporary errors may result in control system signals because the
output terminals on DC Output Units and other Units will momentarily turn
ON when power is turned ON to the PC.
• Do not turn OFF the power supply to the PC when data is being trans-
ferred. In particular, do not turn OFF the power supply when reading or
writing a Memory Card. Also, do not remove the Memory Card when the
BUSY indicator is lit. To remove a Memory Card, first press the memory
card power supply switch and then wait for the BUSY indicator to go out
before removing the Memory Card.
• If the I/O Hold Bit (SR 25212) is turned ON, the outputs from the PC will
not be turned OFF and will maintain their previous status when the PC is
switched from RUN or MONITOR mode to PROGRAM mode. Make sure
that the external loads will not produce dangerous conditions when this
occurs. (When operation stops for a fatal error, including those produced
with the FALS(07) instruction, all outputs from Output Unit will be turned
OFF and only the internal output status will be maintained.)
• Install the Units properly as specified in the operation manuals. Improper
installation of the Units may result in malfunction.
• Mount Units only after checking terminal blocks and connectors com-
pletely.
• When assembling the Units or mounting the end cover, be sure to lock
them securely as shown in the following illustrations. If they are not prop-
erly locked, desired functionality may not be achieved.
• Be sure to mount the end cover to the rightmost Unit.
• Be sure that all the mounting screws, terminal screws, and cable connec-
tor 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 I/O cables,
and other items with locking devices are properly locked into place.
Improper locking may result in malfunction.
• Be sure to confirm the orientation and polarities when connecting terminal
blocks and connectors.
• 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 dis-
sipation. Leaving the label attached may result in malfunction.
• Wire all connections correctly.
• When supplying power at 200 to 240 V AC from a CQM1-PA216 Power
Supply Unit, always remove the metal jumper from the voltage selector
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