Mitsubishi Electric MELSEC iQ-F FX5 Series User Manual page 9

[Wiring Precautions]
CAUTION
● Do not supply power externally to the [24 +] and [24 V] terminals (24 V DC 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. For details, refer to the user's manual
(Hardware) of the CPU module used.
● Connect the power supply wiring to the dedicated terminals described in the user's manual
(Hardware) of the CPU module used. 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 connection cables at least 100 mm away from the main circuit, high-voltage line,
load line or power line.
- Ground the shield of the shielded wire or shield 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 at one point on the signal receiving side. However, do not
use common grounding with heavy electrical systems.
● For Ethernet cables to be used in the system, select the ones that meet the specifications in this
manual. If not, normal data transmission is not guaranteed.
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