Mitsubishi Electric MELSEC iQ-F Series User Manual page 7

[WIRING PRECAUTIONS]
CAUTION
● Perform class D grounding (grounding resistance: 100 or less) of the grounding terminal on the CPU
module and extension modules with a wire 2 mm
heavy electrical systems (refer to the User's Manual (Hardware) of the CPU module used).
● Individually ground the FG terminal of the programmable controller with a ground resistance of 100
or less. Failure to do so may result in electric shock or malfunction.
● Install module so that excessive force will not be applied to terminal blocks, 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 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 shielded wire or shielded cable at one point on the PLC. 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 described in
 Page 67 Wiring Products. If not, normal data transmission is not guaranteed.
[STARTUP AND MAINTENANCE PRECAUTIONS]
WARNING
● Do not touch any terminal while the PLC's power is on. Doing so may cause electric shock or
malfunctions.
● Before cleaning or retightening terminals, cut off all phases of the power supply externally. Failure to
do so in the power-on status may cause electric shock.
● Before modifying the program in operation, forcible output, running or stopping the PLC, read through
this manual carefully, and ensure complete safety. 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 an engineering tool and a GOT) Doing so may cause destruction or malfunction of the
PLC program.
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or thicker. Do not use common grounding with
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