3.1.1 Computer-based systems should fulfill the
functional requirements of the system under control for all operating
conditions including emergency conditions, taking into account:
- Danger to persons
- Environmental impact
- Damage to equipment
- Usability
- Operability of non-computer devices and systems, etc.
3.1.2 If process times for functions of the system
are shorter than the reaction times of the operator and therefore
damage cannot be prevented by manual intervention, means of automatic
intervention should be provided.
3.1.3 A computer-based system should have sufficient
capability to:
- perform necessary autonomous operations,
- accept user commands, inform the user correctly,
- under all operating conditions including emergency.
3.1.4 System capability should provide adequate
response times for all functions, taking into consideration the maximum
load and maximum number of simultaneous tasks, including network communication
speed, under normal and abnormal process conditions.
3.1.5 Computer-based systems should be designed
in such a way that they can be used without special previous knowledge,
otherwise appropriate assistance should be provided for the user,
as specified in section 6 - Training.
3.1.6 Computer-based systems should be protected
against unintentional or unauthorized modification of programs and
data.