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Safety Precautions
(Read these precautions before use.)
2. WIRING PRECAUTIONS
3. STARTUP AND MAINTENANCE PRECAUTIONS
• Make sure to cut off all phases of the power supply externally before attempting wiring work.
Failure to do so may cause electric shock or damages to the product.
• 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 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.
• Make sure to observe the following precautions in order to prevent malfunctions under the influence of noise:
- Do not bundle the power line or twisted shielded cable together with or lay it close to the main circuit, high-
voltage line, or load line.
Otherwise, noise disturbance and/or surge induction are likely to take place. As a guideline, lay the control line
at least 100mm (3.94") or more away from the main circuit, high-voltage line, or load line.
- Ground the shield of the analog input/output cable at one point on the signal receiving side.
However, do not use common grounding with heavy electrical systems.
• Make sure to properly wire to the European terminal board in accordance with the following precautions.
Failure to do so may cause electric shock, a short-circuit, wire breakage, or damage to the product.
- The disposal size of the cable end should be 9 mm (0.35").
- Tightening torque should be between 0.22 to 0.25 N
•
m.
- Twist the end of strand wire and make sure there are no loose wires.
- Do not solder-plate the electric wire ends.
- Do not connect more than the specified number of wires or electric wires of unspecified size.
- Affix the electric wires so that neither the terminal block nor the connected parts are directly stressed.
• Do not touch any terminal while the PLC's power is on.
Doing so may cause electrical shock or malfunctions.
• Before cleaning or retightening terminals, cut off all phases of the power supply externally.
Failure to do so may cause electric shock.
• Before modifying or disrupting the program in operation or running the PLC, carefully read through this manual
and the associated manuals and ensure the safety of the operation.
An operation error may damage the machinery or cause accidents.
• Do not change the program in the PLC from two or more peripheral equipment devices at the same time. (i.e. from
a programming tool and a GOT)
Doing so may cause destruction or malfunction of the PLC program.
• Do not disassemble or modify the PLC.
Doing so may cause fire, equipment failures, or malfunctions.
For repair, contact your local Mitsubishi Electric distributor.
• Turn off the power to the PLC before connecting or disconnecting any extension cable.
Failure to do so may cause equipment failures or malfunctions.
• Turn of the power to the PLC before attaching or detaching the peripheral devices, expansion boards, special
adapters, and extension blocks.
Failure to do so may cause equipment failures or malfunctions.