2
by improper usage is not covered by warranty.
5. Inovance shall take no responsibility for any personal injuries or property damage caused by
improper usage.
■ Safety Levels and Denitions
: Indicates that failure to comply with the notice may result in severe
personal injuries or even death.
: The “CAUTION” sign indicates that failure to comply with the notice may result
in minor or moderate personal injury or damage to the equipment.
Please keep this guide well so that it can be read when necessary and forward this guide to the
end user.
Control system design
◆ Provide a safety circuit outside the PLC so that the control system can still work safely once
external power failure or PLC fault occurs.
◆ Add a fuse or circuit breaker because the module may smoke or catch re due to long-time
overcurrent caused by operation above rated current or load short-circuit.
◆ An emergency stop circuit, a protection circuit, a forward/reverse operation interlocked circuit,
and a upper position limit and lower position limit interlocked circuit must be set in the
external circuits of PLC to prevent damage to the machine.
◆ To ensure safe operation, for the output signals that may cause critical accidents, please design
external protection circuit and safety mechanism.
◆ Once PLC CPU detects abnormality in the system , all outputs may be closed; however, when
a fault occurs in the controller circuit, the output may not be under control. Therefore, it is
necessary to design an appropriate external control circuit to ensure normal operation.
◆ If the PLC's output units such as relays or transistors are damaged, the output may fail to switch
between ON and OFF states according to the commands.
◆ The PLC is designed to be used in indoor electrical environment (overvoltage category II). The
power supply must have a system-level lightning protection device, assuring that overvoltage
due to lightning shock cannot be applied to the PLC's power supply input terminals, signal
input terminals and output terminals and so forth, so as to avoid damage to the equipment.
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