Omron GRT1-CRT - 05-2008 Operation Manual page 9

Safety Precautions
Descriptions of Symbols
Do not try to disassemble a Unit or touch the terminal block while
the power is ON. Doing this can cause electrical shock.
Make sure that the voltage and current input to the Units are in the
specified ranges. If the voltage and current are not in the specified
ranges, there can be Unit malfunctions or fire.
Turn OFF the I/O power supply to a SmartSlice I/O Unit before you
replace it with the online replacement procedure. If there is external
power to a terminal for a Relay Output Slave, for example, turn OFF
the external power before you replace the SmartSlice I/O Unit. If
you replace a Slave I/O Unit with the power ON, incorrect outputs,
incorrect inputs, or electric shock can occur.
x
This symbol shows operations that you must not do.
The specified operation shows in the circle.
This example shows "do not disassemble."
This symbol shows precautions (including warnings).
The specified operation shows in the triangle.
This example shows a general precaution.
This symbol shows operations that you must do.
The specified operation shows in the circle.
This example shows a general precaution for something that
you must do.
WARNING