2
[DESIGN PRECAUTIONS]
[INSTALLATION PRECAUTIONS]
● Do not write any data to the "system area" and "write-protect area" of the buffer memory in the
intelligent function module. Executing data writing to the "system area" or "write-protect area" may
cause malfunction of the programmable controller alarm. For the "system area" or "write-protect
area", refer to Page 68 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.
CAUTION
● Do not install the control lines or communication cables together with the main circuit lines or power
cables. Keep a distance of 100 mm or more between them. 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 dose not exceed the value corresponding to the
maximum load specification of the resistance load.
● Do not power off the CPU module or reset the CPU module while the settings are being written. Doing
so will make the data in the flash ROM undefined. The values need to be set in the buffer memory and
written to the flash ROM again. Doing so also may cause malfunction or failure of the module.
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) of the CPU module used.
Never use the product in areas with excessive dust, oily smoke, conductive dusts, corrosive gas (salt
air, Cl
2
, H
2
S, SO
2
or NO
2
), flammable gas, vibration or impacts, or expose it to high temperature,
condensation, or rain and wind.
If the product is used in such conditions, electric shock, fire, malfunctions, deterioration or damage
may occur.
WARNING
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