Mitsubishi MELSEC QJ71C24, User Manual

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MELSEC-Q
4 SETTINGS AND PROCEDURES PRIOR TO OPERATION
4 SETTINGS AND PROCEDURES PRIOR TO OPERATION
This chapter explains the settings and procedures required before starting a system
that uses the Q series C24.
POINT
(1) When using the Q series C24, please read the safety precautions at the
beginning of this manual.
(2) The installation and setup methods of the Q series C24 are the same as those
for CPU modules.
(3) For module installation and setup, see the user's manual for the programmable
controller CPU used.
4.1 Handling Precautions
The following explains the precautions for handling the Q series C24:
(1) Do not drop the module or subject it to heavy impact since it is made of resin.
(2) Tighten the screws such as module fixing screws within the following ranges.
Screw location Tightening torque range Remarks
RS-422/485 terminal block terminal screw
(M3 screw)
0.42 to 0.58 N · m -
RS-422/485 plug-in connector socket
terminal screw for QJ71C24N-R4 (M2
screw)
0.20 to 0.25 N · m -
RS-232 cable connector screw (M2.6 screw) 0.20 to 0.39 N · m
Screw hole depth:
L=3.2mm or less
(Internal length from
the surface)
Module fixing screw (normally not required)
(M3 screw) ( 1)
0.36 to 0.48 N · m -
1 The module can be easily fixed onto the base unit using the hook at the top
of the module.
However, it is recommended to secure the module with the module fixing
screw if the module is subject to significant vibration.
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