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6. LOADING AND INSTALLATION
6. LOADING AND INSTALLATION
WARNING
CAUTION
This chapter provides loading and installation methods and instructions to be
followed to increase system reliability and ensure optimum functions.
Use the PLC in an environment that conforms to the general specifications
given in the manual.
Not doing so can cause an electric shock, fire, misoperation or product
damage or deterioration.
Securely fix the module using the DIN rail or mounting screws and securely
tighten the mounting screws within the specified torque range.
Undertightening can cause a drop.
Overtightening can cause a drop due to damaged screws or module.
Plug each cable connector into the corresponding socket securely.
Incomplete plugging can cause mis-output due to a contact fault.
Do not touch the conductive areas and electronic parts of the module directly.
Doing so can cause the module to misoperate or fail.
Before starting mounting, wiring or other work, always switch power off
externally in all phases.
Not doing so may cause an electric shock or product damage.
When switching power on or starting operation after mounting, wiring or other
work, always fit the supplied terminal cover to the product.
Not doing so can cause an electric shock.
Always connect the FG and LG terminals to the ground using class D (class-3)
or higher grounding exclusively designed for the PLC.
Not doing so may cause an electric shock or misoperation.
Wire the PLC correctly after confirming the rated voltage and terminal
arrangement of the product.
A fire or failure can occur if the power supply connected is different from the
rating or wiring is incorrect.
Do not connect the A1FXCPU and extension module outputs in parallel.
Doing so can cause the power supply module to overheat, leading to a fire or
failure.
Do not supply external power to the +24V/24G terminals of the A1FXCPU and
the 24+ terminal of the extension module.
Also, do not wire the empty terminal (NC) of the A1FXCPU and the empty
terminal
of the extension module externally.
Doing so may cause product damage.
Tighten the terminal screws to the specified torque.
Undertightening can cause a short circuit, fire or misoperation.
Overtightening can cause a drop, short circuit or misoperation due to damaged
screws or module.
Ensure that foreign matters such as chips and wire off-cuts do not enter the
module.
They can cause a fire, failure or misoperation.
6 - 1
MELSEC-A
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