Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 4

WARNING
● Do not write any data to the "system area" and "write-protect area" of the buffer memory in the
module. Executing data writing to the "system area" or "write protect area" may cause malfunction of
the programmable controller alarm. For the "system area" and "write-protect area", refer to Page
128 Buffer Memory.
● If a communication cable is disconnected, the network may be unstable, resulting in a communication
failure of multiple stations. Construct an interlock circuit in the program so that the system always
operates on the safe side even if communications fail. Incorrect output or malfunction may result in an
accident.
● To maintain the safety of the programmable controller system against unauthorized access from
external devices via the network, take appropriate measures. To maintain the safety against
unauthorized access via the Internet, take measures such as installing a firewall.
● To set a refresh device in the module parameters, select the non-latch device for the remote output
(RY). If a latch device, such as L, is selected, the CPU module holds the device status even after its
status is changed to STOP. For how to stop data link, refer to the troubleshooting in this manual.
[DESIGN PRECAUTIONS]
CAUTION
● Do not bundle the control lines or communication cables together with or lay them close to the main
circuit or power line. As a guideline, lay the control line and communication cables at least 100 mm
away from the main circuit or power line. Failure to do so may result in malfunction due to noise.
● When an inductive load such as a lamp, heater, or solenoid valve is controlled, a large current
(approximately ten times greater than normal) may flow when the output is turned from off to on. Take
proper measures so that the flowing current does not exceed the value corresponding to the
maximum load specification of the resistance load.
● After the CPU module is powered on or is reset, the time taken to enter the RUN status varies
depending on the system configuration, parameter settings, and/or program size.
Design circuits so that the entire system will always operate safely, regardless of the time.
● Simultaneously turn on and off the power supplies of the CPU module and extension modules.
● If a long-time power failure or an abnormal voltage drop occurs, the programmable controller stops,
and output is turned off. When the power supply is restored, it will automatically restart. (when the
RUN/STOP/RESET switch is on RUN side).
[INSTALLATION PRECAUTIONS]
WARNING
● Make sure to cut off all phases of the power supply externally before attempting installation or wiring
work. Failure to do so may cause electric shock or damage to the product.
● Use the product within the generic environment specifications described in the User's Manual
(Hardware) for the CPU module used.
Never use the product in areas with excessive dust, oily smoke, conductive dusts, corrosive gas (salt
air, Cl , H S, SO
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condensation, or rain and wind.
If the product is used in such conditions, electric shock, fire, malfunctions, deterioration or damage
may occur.
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or NO ), flammable gas, vibration or impacts, or expose it to high temperature,
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