Safety Precautions
To reduce the chance of accident, please read the safety precautions very carefully before operation. The
"Caution, Notice, Warning, Danger" symbols in this manual do not represent all the safety points to be observed,
and are only used as a supplement to various operation safety points. Therefore, the installation and operation
personnel must be strictly trained and master the correct operations and all the safety points before actual
operation.
When operating Emerson PLC products, the safety rules in the industry, the general safety points and special
safety instructions specified in this manual must be strictly observed.
These notices are highlighted in the manual by a warning triangle and are marked as follows according to the
level of danger:
Danger: indicates that death, severe personal injury, or substantial property damage will result if proper
precautions are not taken.
Warning: indicates that death, severe personal injury, or substantial property damage could possibly
result if proper precautions are not taken.
Caution: indicates that minor personal injury or property damage can result if proper precautions are not
taken.
Notes for designing
The programming must include safety circuit to ensure the safe application of the PLC (Programmable Logic
Controller) system upon power off or the PLC malfunction. Note the following when programming:
z The external circuit of the PLC must include the emergency braking circuit, protection circuit, mutual
interlock circuit of forward/reverse rotation, and the interlock switch of position upper/lower limit for
preventing equipment from damage.
z For the safe operation of the equipment and output signals of the serious accident, please design the
external protection circuit and the safety mechanism.
z All the outputs may be shutdown when the CPU of the PLC detects the abnormity of the system; the failure
of part PLC circuit may result in uncontrolled PLC output. A suitable external control circuit must be
designed to ensure the normal operation of the equipment.
z When the PLC output unit such as the relay or the transistor is damaged, the PLC output cannot be
controlled as ON or OFF state.
z The PLC is designed to be used in the electrical environment of indoor area B and C
☆
. However, to prevent
the high lightning voltage from damaging the equipment through the ports of power input, signal input or
control output, a SPD should be installed in the power supply system.
☆: According to IEC61131-2, section 8.3.1 classification declaration
Notes for installation
z Units should not be installed in areas subject to the following conditions: excessive or conductive dust,
corrosive or flammable gas, moisture or rain, excessive heat, regular impact shocks or excessive vibration.
Electric shock, fire hazard and mishandling may also damage the product.
z Take special care not to allow metal debris and wire lead to fall inside the vent of the PLC during the screw
hole processing and wiring. Otherwise there is a danger of fire, damage or faulty operation of equipment.
z Once the installation of the new PLC is complete, remove everything on the surface of the vent, including
packing goods such as protective paper. Otherwise the poor ventilation during the operation may result in
fire, damage or faulty operation of equipment.
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