Mitsubishi Electric MELSEC iQ-F Series User Manual page 6

[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 or thicker.
Do not use common grounding with heavy electrical systems (refer to the User's Manual (Hardware)
for 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 programmable controller failure.
● Make sure to observe the following precautions in order 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.
● For Ethernet cables to be used in the system, select the ones that meet the specifications described in
the user's manual for the module used. If not, normal data transmission is not guaranteed.
[Startup and Maintenance Precautions]
WARNING
● Do not touch any terminal while the programmable controller'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 programmable
controller, 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 programmable controller 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 programmable controller program.
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