8 Debug in the positioning
64
FX Configurator-FP
Operation Manual
8. Debug in the positioning
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
• Observe the following items. Failure to do so may cause incorrect data-writing by noise to PLCs and result the
PLC failure, machine damage or an accident.
1) Do not lay close or bundle with the main circuit line, high-voltage line, or load line.
Noise and Surge induction interfere with the system operation.
Keep a safe distance of least 100 mm (3.94") from the above lines during wiring.
2) Ground the shield wire or shield of a shielded cable at one point on the PLC. However, do not ground at the
same point as high voltage lines.
• 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.
INSTALLATION PRECAUTIONS
• Make sure to cut off all phases of the power supply externally before starting the installation or wiring work.
Failure to do so may cause electric shock.
INSTALLATION PRECAUTIONS
• Fit the extension cables, peripheral device connecting cables, input/output cables and battery connecting cable
securely to the designated connectors.
Contact failures may cause malfunctions.
• 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.
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