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xvii
Safety Precautions 3
• Outputs may remain ON due to a malfunction in the built-in transistor out-
puts or other internal circuits. As a countermeasure for such problems,
external safety measures must be provided to ensure the safety of the
system.
• Part of the DM Area (data memory) in the Motion Control Module is held
using the super capacitor. Corrupted memory may prevent the correct
values from being saved, however. Take appropriate measures in the lad-
der program whenever the Memory Not Held Flag (A404.14) turns ON,
such as resetting the data in the DM Area.
• Part of the DM Area in the Coordinator Module is backed up in the built-in
flash memory when transferring data from the CX-Programmer. Do not
turn OFF the power to the FQM1 while data is being transferred. The data
will not be backed up if the power is turned OFF.
• 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 FQM1
• Force-setting/force-resetting any bit in memory
• Changing the present value of any word or any set value in memory
• 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.
• Be sure that all the terminal screws and cable connector screws are tight-
ened to the torque specified in the relevant manuals. Incorrect tightening
torque may result in malfunction.
• Mount the Modules only after checking the connectors and terminal
blocks completely.
• Before touching the Module, 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.
• Be sure that the terminal blocks, connectors, and other items with locking
devices are properly locked into place. Improper locking may result in
malfunction.
• Wire correctly according to the specified procedures.
• Always use the power supply voltage specified in the operation manuals.
An incorrect voltage may result in malfunction or burning.
• 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 malfunction.
• Leave the dust protective label attached to the Module when wiring.
Removing the label may result in malfunction.
• Remove the dust protective label after the completion of wiring to ensure
proper heat dissipation. Leaving the label attached may result in malfunc-
tion.
• Use crimp terminals for wiring. Do not connect bare stranded wires
directly to terminals. Connection of bare stranded wires may result in
burning.
• Do not apply voltages to the built-in inputs in excess of the rated input
voltage. Excess voltages may result in burning.