Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 7

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Table of Contents

[WIRING PRECAUTIONS]

● 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 cause damage to the product. Note that power may

be supplied even when an electronic load which equips with an internal bias power supply is

● Perform class D grounding (grounding resistance: 100 or less) to 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 (refer to the MELSEC iQ-F FX5S/

FX5UJ/FX5U/FX5UC User's Manual (Hardware)).

● Connect the power supply to the dedicated terminals specified in the MELSEC iQ-F FX5S/FX5UJ/

FX5U/FX5UC User's Manual (Hardware). 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.

● 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 PLC failure.

● Make sure to observe the following precautions in order to prevent any damage to the machinery or

accidents due to malfunction of the PLC caused by abnormal data written to the PLC due to the

effects of noise:

Do not bundle the power line, control line, input/output cables 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 shield wire or shielded cable at one point on the PLC. However, do not

use common grounding with heavy electrical systems.

Ground the shield of the analog input/output cable in accordance with the manuals of each model.

However, do not use common grounding with heavy electrical systems.

Troubleshooting