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1.2 Setup Procedure for Positioning Control
B - 4
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
1.2 Setup Procedure for Positioning Control
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.
DESIGN PRECAUTIONS
• Do not bundle the control line together with or lay it close to the main circuit or power line. As a guideline, lay the
control line at least 100mm (3.94") or more away from the main circuit or power line.
Noise may cause malfunctions.
• Install module so that excessive force will not be applied to the built-in programming port, power connectors, I/O
connectors, communication connectors, or communication cables.
Failure to do so may result in wire damage/breakage or PLC failure.
WIRING PRECAUTIONS
• Make sure to cut off all phases of the power supply externally before attempting installation or wiring work.
Failure to do so may cause electric shock or damage to the product.
• Make sure to attach the terminal cover, offered as an accessory, before turning on the power or initiating operation
after installation or wiring work.
Failure to do so may cause electric shock.
WIRING PRECAUTIONS
• Connect the AC power supply to the dedicated terminals specified in the manual of the PLC main unit.
If an AC power supply is connected to a DC input/output terminal or DC power supply terminal, the PLC will burn
out.
• Connect the DC power supply to the dedicated terminals specified in the manual of the PLC main unit.
If an AC power supply is connected to a DC input/output terminal or DC power supply terminal, the PLC will burn
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 on the FX
3U/FX3G PLC
main unit with a wire 2 mm
2
or thicker.
Do not use common grounding with heavy electrical systems (refer to the manual of the PLC main unit).
• Perform class D grounding (grounding resistance: 100Ω or less) to the grounding terminal on the main unit.
Do not use common grounding with heavy electrical systems.
• When drilling screw holes or wiring, make sure cutting or wire debris does not enter the ventilation slits.
Failure to do so may cause fire, equipment failures or malfunctions.
• Install module so that excessive force will not be applied to I/O connectors.
Failure to do so may result in wire damage/breakage or PLC failure.
• Connect input/output cables securely to their designated connectors.
Loose connections may cause malfunctions.