Mitsubishi MELSEC-A A1SJ71PB93D User Manual page 3

[DESIGN PRECAUTIONS]
Do not output the "prohibited to use" signal as the output signal to a special
function module from the programmable controller CPU.
Writing data into the "system area" or outputting a signal for "prohibited to
use" may cause system malfunction in the programmable controller.
When the PROFIBUS cable is laid, do not lay it close to main circuits or
power lines. They should be installed 100mm(3.9inch) or more from each
other. Not doing so could result in noise that would cause malfunctioning.
[INSTALLATION PRECAUTIONS]
Use the PLC in an environment that meets the general specifications
contained in the CPU user's manual.
Using this PLC in an environment outside the range of the general
specifications may cause electric shock, fire, malfunction, and damage to or
deterioration of the product.
Load the module by securely inserting the module fixing hook at the bottom
of the module into the fixing hole of the base unit.
Always screw the module to the base unit to the specified torque.
Tighten the screws within the range of specified torque.
If the screws are loose, it may cause the module to fallout, short circuits, or
malfunction.
If the screws are tightened too much, it may cause damage to the screw and/
or the module, resulting in fallout, short circuits or malfunction.
Switch all phases of the external power supply off when mounting or
removing the module.
Not ding so may cause electric shock or damage to the module.
Do not touch the conductive area or electric parts of the module.
Doing so may cause module malfunctioning or breakdowns.
WARNING
CAUTION
CAUTION
A-2