XGQ-SS2A Просмотр технического описания (PDF) - Unspecified

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XGQ-SS2A

Programmable Logic Controller

Unspecified 

Safety Instruction

Safety Instructions when designing

Warning

 Please, install protection circuit on the exterior of PLC to protect

the whole control system from any error in external power or PLC

module. Any abnormal output or operation may cause serious problem

in safety of the whole system.

- Install applicable protection unit on the exterior of PLC to protect

the system from physical damage such as emergent stop switch,

protection circuit, the upper/lowest limit switch, forward/reverse

operation interlock circuit, etc.

- If any system error (watch-dog timer error, module installation error,

etc.) is detected during CPU operation in PLC, the whole output is

designed to be turned off and stopped for system safety. However,

in case CPU error if caused on output device itself such as relay or

TR can not be detected, the output may be kept on, which may

cause serious problems. Thus, you are recommended to install an

addition circuit to monitor the output status.

 Never connect the overload than rated to the output module nor

allow the output circuit to have a short circuit, which may cause a

fire.

 Never let the external power of the output circuit be designed to

be On earlier than PLC power, which may cause abnormal output or

operation.

 In case of data exchange between computer or other external

equipment and PLC through communication or any operation of

PLC (e.g. operation mode change), please install interlock in the

sequence program to protect the system from any error. If not, it

may cause abnormal output or operation.

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