2
Essential Safety Precautions
All safety-related procedures stated in this document must be followed to operate the ST correctly and safely. Be sure to
read this and any related documents thoroughly to understand the correct operation and functions of the ST unit.
Safety Icons
Throughout this manual, these icons provide essential safety information for ST operation procedures requiring special
attention. These icons indicate the following levels of danger:
System Design
Indicates situations where severe bodily injury, death or major equipment damage
can occur.
Indicates situations where slight bodily injury or minor equipment damage can
occur.
Indicates actions or procedures that should NOT be performed.
Indicates actions or procedures that MUST be performed to ensure correct unit
operation.
Do not create ST touch panel switches that could possibly endanger the safety of personnel or equipment.
A malfunction of the ST unit, its I/O unit(s), cable(s), or other related equipment can cause unexpected
output signals, leading to a serious accident. Be sure to design all important machine operation switches
so they are operated via a separate control system, and not via the ST.
Do not create ST touch panel switches to control machine safety operations, such as an emergency stop
switch. Install these switches as separate hardware switches, otherwise severe bodily injury or equipment
damage can occur.
Be sure to design your system so that a communication fault between the ST and its host controller will
not cause equipment to malfunction. This is to prevent any possibility of bodily injury or equipment
damage.
Do not use the ST as a warning device for critical alarms that can cause serious operator injury, machine
damage or can halt system operation. Critical alarm indicators and their control/activator units must be
designed using stand-alone hardware and/or mechanical interlocks.
Do not use the ST with aircraft control devices, aerospace equipment, central trunk data transmission
(communication) devices, nuclear power control devices, or medical life support equipment, due to these
devices’ inherent requirements of extremely high levels of safety and reliability.
