Mitsubishi 900 Series User Manual page 7

[Test Operation Precautions]
Before performing test operation (bit device on/off, word device's present value changing, timer/
counter's set value and present value changing, buffer memory's present value changing) for a
user-created monitor screen or system monitoring, read the manual carefully to fully understand
how to operate the equipment.
During test operation, never change the data of the devices which are used to perform significant
operation for the system.
False output or malfunction can cause an accident.
[Startup/Maintenance Precautions]
When opening the panel on which the GOT is installed, always power off the GOT.
Not doing so can cause the GOT to fail or malfunction.
When power is on, do not touch the terminals.
Doing so can cause an electric shock or malfunction.
Do not change the extension number setting switch and I/O slot setting switch setting during
power-on.
Doing so can cause a malfunction.
Before starting cleaning or terminal screw retightening, always turn the power OFF before starting
cleaning or terminal screw retightening.
Not switching the power off in all phases can cause a module failure or malfunction.
Undertightening can cause a short circuit or malfunction.
Overtightening can cause a short circuit or malfunction due to the damage of the screws or
module.
When touching the GOT, communication unit, and/or option unit, or before touching the panel with
the GOT installed, touch a grounded metal object to discharge the static electricity from the
human body.
Failure to do so may cause the unit to fail or malfunction.
Do not disassemble or modify the module.
Doing so can cause a failure, malfunction, injury or fire.
Do not touch the conductive and electronic parts of the module directly.
Doing so can cause a module malfunction or failure.
The cables connected to the module must be run in ducts or clamped.
Not doing so can cause the module or cable to be damaged due to the dangling, motion or
accidental pulling of the cables or can cause a malfunction due to a cable connection fault.
When unplugging the cable connected to the module, do not hold and pull the cable portion.
Doing so can cause the module or cable to be damaged or can cause a malfunction due to a
cable connection fault.
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CAUTION