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[DESIGN PRECAUTIONS]
If a communications error occurs to a DeviceNetwork, the station in such a
communications error will be in a state as follows:
(1) The master station (AJ71DN91, A1SJ71DN91) maintains input data which had been
received from the slave station before the error occurred.
(2) Whether or not the output signal of the slave station to be turned off or maintained is
determined by the specification of the slave station or by the parameter settings in the
master station.
By referring to communications states of the slave station, arrange an interlock circuit in a
sequential program and provide safety mechanism externally of the slave station in order
the system to operate safely.
Do not bundle the control wires and communication cables with the main circuit or power
wires, or install them close to each other. They should be installed at least 100 mm (3.94
in.) away from each other. Failure to do so may generate noise that may cause
malfunctions.
[INSTALLATION PRECAUTIONS]
Use the PLC in the operating environment that meets the general specifications given in
the user's manual of the CPU module. Using the PLC in any other operating environment
may cause an electric shock, fire or malfunction, or may damage or degrade the product.
While pressing the installation lever located at the bottom of module, insert the module
fixing tab into the fixing hole in the base unit until it stops.
Then, securely mount the module with the fixing hole as a supporting point.
If the module is not installed properly, it may cause the module to malfunction, fail or fall off.
Secure the module with screws especially when it is used in an environment where
constant vibrations or strong impact may be expected.
Be sure to tighten the screws using the specified torque. If the screws are loose, it may
cause the module to malfunction or fall off. If the screws are tightened excessively, it may
damage the screws and/or the module, and cause the module to malfunction or fall off.
Before mounting or dismounting the module, make sure to shut off all phases of the
external power supply. Failure to do so may damage the product.
Do not directly touch the conducting parts and electronic parts of the module. This may
cause the module to malfunction or fail.
[WIRING PRECAUTIONS]
Make sure to shut off all the phases of the external power supply before starting installation
or wiring. Otherwise, the personnel may be subjected to an electric shock or the product to
a damage.
Always ground the FG terminal for the PLC. There is a risk of malfunction.
Tighten the terminal screws with the specified torque. If the terminal screws are loose, it
could result in short circuits or erroneous operation. Tightening the terminal screws too far
may cause damages to the screws or the module, resulting in fallout, short circuits, or
malfunction.
WARNING
CAUTION
CAUTION
WARNING
CAUTION
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