Fuxx Control - ARS 2320 / ARS 2340 Instruction Manual - Kuhnke

Fuxx Control ARS 2320 / ARS 2340 KUHNKE Automation
Category 1) Summary of requirements System behaviour 2) Principles to
achieve safety
3 The requirements of category B
and the use of well-tried safety
principles shall apply. Safetyrelevant
parts must be designed as
follows:
it is not acceptable for a fault in
any one of the parts to cause a loss
of the safety function.
the single fault is detected as soon
as possible in a reasonable manner
4 The requirements of category B
and the use of well-tried safety
principles shall apply. Safetyrelevant
parts must be designed
with two channels; permanent selfmonitoring;
complete error
detection!
When a single fault occurs, the
safety function will remain intact.
Some but not all faults will be
detected.
Accumulation of undetected faults
can lead to the loss of the safety
function.
When faults occur, the safety
function always remains intact.
Faults will be detected in time to
prevent the loss of the safety
function.
1) The categories are not meant to be applied in any given sequence or hierarchic order in terms of safety
requirements.
2) The risk assessment will indicate whether the total or partial loss of the safety function(s) arising from
faults is acceptable.
The standard EN 60204-1 describes possible actions for emergency situations and defines the terms
EMERGENCY OFF and EMERGENCY STOP (see Table 25)
Table 25: EMERGENCY OFF and EMERGENCY STOP as per EN 60204-1
Action Definition (EN 60204-1) Emergency situation
EMERGENCY
OFF
EMERGENCY
STOP
This intervention is used to achieve
electrical safety in an emergency situation
by disconnecting the electrical power to a
complete system or installation or part of it.
This intervention is used to achieve
functional safety in an emergency situation
by stopping a machine or moving parts.
An EMERGENCY OFF has to be used if
there is a risk of electric shock or another
risk caused by electricity.
An EMERGENCY STOP is used to stop a
process or a movement which has become
hazardous.
56 E 732 GB
14.12.2006