Mitsubishi FX3UC SERIES User Manual page 3

Before installing, operating, maintenance or inspecting this product, thoroughly should be read and
understood this manual and the associated manuals. Also pay careful attention to safety and handle the
module properly.
This manual classify the safety precautions into two categories:
Depending on circumstances, procedures indicated by
In any case, it is important to follow the directions for usage.
Store this manual in a safe place so that you can take it out and read it 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 watchdog timer error, during self-
diagnosis, all outputs are turned off. Also, when an error that cannot be detected by the PLC
CPU occurs in an input/output control block, output control may be disabled.
External circuits and mechanisms should be designed to ensure safe machinery operation in
such a case.
3) Note that when an error occurs in a relay, triac or transistor output device, the output could be
held either on or off.
For output signals that may lead to serious accidents, external circuits and mechanisms should
be designed to ensure safe machinery operation in such a case.
• Note that when an error occurs in a remote I/O unit, the output could be held either on or off.
For output signals that may lead to serious accidents, external circuits for monitoring should be
provided.
• Do not bundle the control line and CC-Link/LT connection cables together with or lay them close to
the main circuit or power line. As a guideline, lay the control line and CC-Link/LT connection
cables at least 100 mm (3.94") or more away from the main circuit or power line.
Noise may cause malfunctions.
• Install the product so that excessive force will not be applied to peripheral device connectors, power
connectors, input/output connectors, CC-Link/LT interface connectors or CC-Link/LT connection
cables.
Failure to do so may result in wire damage/breakage or PLC failure.
Safety Precaution
(Read these precautions before using.)
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.
(1)
and
may also be linked to serious results.
.
Reference
102
128
134
166
186
211
248
Reference
102
128
134
166
186
211
248