Proface APL3000B - Node Box PC - Manual (Page 3)

2
Essential Safety Precautions
All safety-related procedures stated in this document must be followed to operate the PS-A unit correctly and safely. Be
sure to read this and any related documents thoroughly to understand the correct operation and functions of the PS-A unit.
Safety Icons
Throughout this manual, these icons provide essential safety information for PS-A unit 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 PS-A unit touch panel switches that could possibly endanger the safety of personnel or
equipment. A malfunction of the PS-A 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 PS-A unit.
Do not create PS-A unit 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 PS-A unit 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 PS-A unit 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 PS-A unit with aircraft control devices, aerospace equipment, central trunk data transmis-
sion (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.