Omron FQM1-MMA21, FQM1-CM001 Safety Precautions, xvii, •Changing the operating mode of the FQM1

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.

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