Setup Procedure For Positioning Control - Mitsubishi MELSEC-F FX3U Series User Manual

FX /FX Series PLC User's Manual - Positioning Control Edition
3U 3UC
Built-in Positioning Function
1.2

Setup Procedure for Positioning Control

DESIGN PRECAUTIONS
• Provide a safety circuit on the outside of the PLC so that the whole system operates to ensure the safety even
when external power supply trouble or PLC failure occurs.
Otherwise, malfunctions or output failures may result in an accident.
1) An emergency stop circuit, a protection circuit, an interlock circuit for opposite movements, such as normal
and reverse rotations, and an interlock circuit for preventing damage to the machine at the upper and lower
positioning limits should be configured on the outside of the PLC.
2) When the PLC CPU detects an error, such as a watch dog timer error, during self-diagnosis, all outputs are
turned off. When an error that cannot be detected by the PLC CPU occurs in an input/output control block,
output control may be disabled.
Design external circuits and mechanisms to ensure safe operations of the machine in such a case.
3) When some sort of error occurs in a relay, triac or transistor of the output unit, output may be kept on or off.
For output signals that may lead to serious accidents, design external circuits and mechanisms to ensure safe
operations of the machine in such cases.
DESIGN PRECAUTIONS
• Do not bundle the control line together with the main circuit or power line. Do not lay the control line near them.As
a rule, lay the control line at least 100mm(3.94") or more away from the main circuit or power line.
Noise may cause malfunctions.
• Install in a manner which prevents excessive force from being applied to the built-in connectors dedicated to
programming, power connectors and I/O connectors.
Failure to do so may result in wire breakage or failure of the PLC.
WIRING PRECAUTIONS
• Cut off all phases of the power source externally before installation or wiring work in order to avoid electric shock
or damage of product.
• Make sure to attach the terminal cover offered as an accessory to the product before turning on the power or
starting the operation after installation or wiring work.
Failure to do so may cause electric shock.
WIRING PRECAUTIONS
• Connect the AC power supply wiring to the dedicated terminals described in this manual.
If an AC power supply is connected to a DC input/output terminal or DC power supply terminal, the PLC will be
burnt out.
• Connect the DC power supply wiring to the dedicated terminals described in this manual.
If an AC power supply is connected to a DC input/output terminal or DC power supply terminal, the PLC will be
burnt out.
• Do not wire vacant terminals externally.
Doing so may damage the product.
• Perform class D grounding (grounding resistance: 100Ω or less) to the grounding terminal in the FX
unit with a 2mm
Do not connect the grounding terminal at the same point as a heavy electrical system (refer to the manual of the
PLC main unit).
• Perform class D grounding (grounding resistance: 100Ω or less) to the grounding terminal in the FX
main unit with a wire as thick as possible.
Do not connect the grounding terminal at the same point as a heavy electrical system (refer to the manual of the
PLC main unit).
• When drilling screw holes or wiring, cutting chips or wire chips should not enter ventilation slits. such an accident
may cause fire, failures or malfunctions.
• Use the product in such a status that excessive force is not applied on I/O connectors.
Failure to do so may result in wire breakage or failure of the PLC.
B - 4
or thicker wire.
2
1.2 Setup Procedure for Positioning Control
1 Outline
Series main
3U
Series
3UC