Mitsubishi Electric MELSEC iQ-F Series User Manual page 8

[WIRING PRECAUTIONS]
CAUTION
● Do not supply power externally to the [24+] and [24V] terminals (24VDC service power supply) on the
CPU module or extension modules. Doing so may damage the product. Note that power may be
supplied even when an electronic load which equips with an internal bias power supply is connected.
● Perform class D grounding (grounding resistance: 100 or less) of the grounding terminal on the CPU
module and extension modules with a wire 2 or thicker.
Do not use common grounding with heavy electrical systems.
● Connect the 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 programmable
controller will burn out.
● Do not wire vacant terminals externally. Doing so may damage the product.
● Install module so that excessive force will not be applied to terminal blocks, power connectors, I/O
connectors, communication connectors, or communication cables. Failure to do so may result in wire
damage/breakage or programmable controller failure.
● Make sure to observe the following precautions to prevent any damage to the machinery or accidents
due to malfunction of the programmable controller caused by abnormal data written to the
programmable controller due to the effects of noise.
- Do not bundle the power line, control line and communication cables together with or lay them
close to the main circuit, high-voltage line, load line or power line. As a guideline, lay the power
line, control line and communication cables at least 100mm away from the main circuit, high-
voltage line, load line or power line.
- Ground the shield of the shield wire or shielded cable at one point on the programmable controller.
However, do not use common grounding with heavy electrical systems.
- Ground the shield of the analog I/O wire in accordance with the manuals of each model. However,
do not use common grounding with heavy electrical systems.
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