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7 DATA LINK PROCEDURE
MELSEC-QnA
7.2 Installation and Setting
The following section explains the precautions when handling the master and local
modules, from the time they are unpacked until they are installed.
For more details on the module installation, see the user's manual for the CPU module
used.
7.2.1 Precautions when handling the module
(1) Do not drop the module case or subject it to heavy impact since it is made of resin.
(2) Do not remove the print circuit board of each module from its case. This may cause
a failure in the module.
(3) Prevent foreign matter such as dust or wire chips from entering the module.
Such foreign matter can cause a fire, failure, or malfunction.
(4) Solderless terminals with insulation sleeve cannot be used for the terminal block.
It is recommended that the wiring connecting sections of the solderless terminals
will be covered with a marking tube or an insulation tube.
(5) Before handling the module, touch a grounded metal object to discharge the static
electricity from the human body.
Failure to do so may cause the module to fail or malfunction.
(6) Tighten the module mounting screws and terminal screws within the following
torque range.
Screw location Tightening torque range
Module mounting screw (M4 screw) 0.78 to 1.18 N·m
Terminal-block screw (M3.5 screw) 0.59 to 0.88 N·m
Terminal-block installation screw (M3.5 screw) 0.49 to 0.78 N·m
(7) Insert the tabs at the bottom of the module into the holes in the base unit before
mounting the module.
(For the Q2AS series modules, make sure screws are securely tightened to the
base unit with the specified torque.)
Incorrect mounting may cause malfunction, failure, or drop of the module.
POINT
(1) Turn off the power supply to the applicable station before installing or removing the terminal
block.
If the terminal block is installed or removed without turning off the power supply to the
applicable station, correct data transmission cannot be guaranteed.
(2) Power off the system in advance when removing the terminating resistor to change the
system. If the terminating resistor is removed and installed while the system is energized,
normal data transmission will not be guaranteed.