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FX3G/FX3U/FX3UC SERIES PROGRAMMABLE CONTROLLERS
USER’S MANUAL
MODBUS Serial Communication Edition
Safety Precautions
(Read these precautions before use.)
Before installing, operating, maintenance or inspecting this product, thoroughly read through and understand
this manual and all of the associated manuals. Also, take care to handle the module properly and safety.
This manual classifies the safety precautions into two categories: and .
Indicates that incorrect handling may cause hazardous conditions, resulting in
death or severe injury.
Indicates that incorrect handling may cause hazardous conditions, resulting in
medium or slight personal injury or physical damage.
Depending on the circumstances, procedures indicated by may also cause severe injury.
In any case, it is important to follow the directions for usage.
Store this manual in a safe place so that it can be taken out and read whenever necessary. Always forward it
to the end user.
1. DESIGN PRECAUTIONS
• Make sure to have the following safety circuits outside of the PLC to ensure safe system operation even during
external power supply problems or PLC failure.
Otherwise, malfunctions may cause serious accidents.
1) Most importantly, have the following: an emergency stop circuit, a protection circuit, an interlock circuit for
opposite movements (such as normal vs. reverse rotation), and an interlock circuit (to prevent damage to the
equipment at the upper and lower positioning limits).
2) Note that when the PLC CPU detects an error, such as a watchd
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