precautions of the manual when installing, operating, and maintaining the product.
3. The "CAUTION", "WARNING" and "DANGER" items in the manual do not represent all the
safety matters to be observed but are supplementary to all safety precautions.
4. This product should be used in an environment stated in the design specifications. Otherwise,
it may cause malfunctions. Functional abnormalities or component damages caused by failure to
comply with relevant regulations are not at the range of product quality guarantee.
5. Our company will not bear any legal responsibility for personal safety accidents, property
losses, and others caused by irregularities.
Safety Level Definition
WARNING: Indicates the improper operation which, if not avoided, may cause death or
serious injury;
CAUTION: Indicates the improper operation which, if not avoided, may cause moderate or
minor injury, as well as equipment damage.
Please keep this guide well so that it can be read when necessary and forward this guide to the end user.
Control System Designing
WARNING
◆ 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 fire due to long-time
overcurrent caused by operation above rated current or load short-circuit.
CAUTION
◆ 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
the 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
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