Omron HOME SECURITY SYSTEM - MOTION SENSOR FQM1-MMA21 - Manual (Page 14)

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Safety Precautions 3
• When the 24-VDC output (service power supply to the FQM1) is over-
loaded or short-circuited, the voltage may drop and result in the outputs
being turned OFF. As a countermeasure for such problems, external
safety measures must be provided to ensure safety in the system.
!WARNING 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. Not doing so may
result in serious accidents.
!Caution Execute online edit only after confirming that no adverse effects will be
caused by extending the cycle time. Otherwise, the input signals may not be
readable.
!Caution User programs and parameters written to the Coordinator Module or Motion
Control Module will be automatically backed up in the FQM1 flash memory
(flash memory function). The contents of I/O memory (including the DM Area),
however, are not written to flash memory. Part of the DM Area used as a hold-
ing area when recovering from a power interruption is backed up using a
super capacitor, but correct values will not be maintained if an error occurs
that prevents memory backup. As a countermeasure for such problems, take
appropriate measures in the program using the Memory Not Held Flag
(A404.14) when externally outputting the contents of the DM Area.
!Caution Confirm safety at the destination Module before transferring a program to
another Module or editing the I/O area. Doing either of these without confirm-
ing safety may result in injury.
!Caution Tighten the screws on the terminal block of the AC Power Supply Unit to the
torque specified in the operation manual. The loose screws may result in
burning or malfunction.
!Caution Do not touch the Power Supply Unit while the power is ON, and immediately
after turning OFF the power. Touching hot surfaces may result in burning.
!Caution Pay careful attention to the polarities (+/-) when wiring the DC power supply.
A wrong connection may cause malfunction of the system.
3-1 Operating Environment Precautions
!Caution Do not operate the control system in the following places:
• Locations subject to direct sunlight
• Locations subject to temperatures or humidity outside the range specified
in the specifications
• Locations subject to condensation as the result of severe changes in tem-
perature
• Locations subject to corrosive or flammable gases
• Locations subject to dust (especially iron dust) or salts
• Locations subject to exposure to water, oil, or chemicals
• Locations subject to shock or vibration
!Caution Take appropriate and sufficient countermeasures when installing systems in
the following locations: