Safety Guidelines
Only qualified person are allowed to install, operate and maintenance on CTH200 Series PLC.
Qualified persons are defined as persons who are authorized to commission, ground, tag circuits,
equipment, and systems in accordance with established safety practices and standards.
COTRUST has no responsibility for any consequence caused by using this product.
This manual contains notices that you should observe to ensure your personal safety, as well as
to protect the product and connected equipment. These notices are highlighted in the manual by
a warning triangle and are marked as follows according to the level of danger:
“Warning” sign indicates operation not as required may result in severe personal injuries or
even death.
“Caution” sign indicates operation not as required may result in personal injuries or device
damage
“Notice” sign indicates necessary supplements or explanations
Precautions for Use
There must be safety circuit to ensure the operation security of PLC system when the external
power off or PLC failed. Notices in design for use including:
Emergency brake circuit, safety circuit, positive/reverse operation interlock circuit and the
upper/lower limit interlock switch of position for preventing device damage must be implemented
in the PLC external circuit.
To ensure the device operation security, the external guard circuit and safety mechanism for the
output signal of major accident is a must.
The PLC can detect system exceptions which resulting all output turned off, to ensure the device
operation normal, external control circuits need to be added.
When the Relay or Resistor Unit in PLC was damaged, the ON/OFF for PLC Outputs cannot be
controlled.
The Power system should fitted with lightning protection device, to prevent the PLC interfaces,
like power/signal inputs and controller outputs from being damaged by lightning over-voltage.
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