Safety Automation Forum 2012
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Transcript of Safety Automation Forum 2012
Copyright © 2012 Rockwell Automation, Inc. All rights reserved.
Safety Standards Update:
The Direction of IEC
62061 and ISO 13849
Derek Jones
Rockwell Automation
Safety related machinery control systems
2
3
Safety related machinery control systems
Withdrawn
EN 954
CATEGORY
FAULT TOLERANCE
DIAGNOSTICS
2005/6 2011
4
Safety related machinery control systems
Withdrawn
FAULT TOLERANCE
DIAGNOSTICS SRS
RELIABILITY
SYSTEMATIC
FSMIEC/EN 62061 SIL
EN ISO 13849 PL
EN 954
CATEGORY
FAULT TOLERANCE
DIAGNOSTICS
2005/6 2011
5
Safety related machinery control systems
Is that OK (or are there any problems?)
Machine
Builder
More complexity?
Data required
6
Safety related machinery control systems
Is that OK (or are there any problems?)
Machine
Builder
More complexity?
Data required
Safety
Component
manufacturer
Multiple standards certification
Data required
IEC 61508, ISO 13849 and IEC 62061
and product standard
7
Merger of ISO 13849 and IEC 62061
Withdrawn
FAULT TOLERANCE
DIAGNOSTICS SRS
RELIABILITY
SYSTEMATIC
FSMIEC/EN 62061 SIL
EN ISO 13849 PL
EN 954
CATEGORY
FAULT TOLERANCE
DIAGNOSTICS
2005/6 2011 2016 ?
IEC ISO
17305
8
Merger of ISO 13849 and IEC 62061
Do we need to care about ISO and IEC if we are in the US?
UL
9
Merger of ISO 13849 and IEC 62061
Do we need to care about ISO and IEC if we are in the US?
UL
GB
10
Merger of ISO 13849 and IEC 62061
Do we need to care about ISO and IEC if we are in the US?
ENUL
ANSIGB
AS
11
Merger of ISO 13849 and IEC 62061
Do we need to care about ISO and IEC if we are in the US?
ENUL
ANSIGB
AS
GOST R
NR
JIS
12
Merger of ISO 13849 and IEC 62061
111 participating member bodies in ISO
USA
France
Germany
Korea, Republic of
China
Romania
Japan
Italy
Poland
Spain
Russian Federation
India
Netherlands
Czech Republic
United Kingdom
Finland
Belgium
Sweden
Switzerland
Hungary
Slovakia
Australia
South Africa
Norway
Turkey
Canada
Bulgaria
Portugal
Ukraine
Brazil
Denmark
Thailand
Malaysia
Indonesia
Israel
Greece
Croatia
Belarus
New Zealand
Sri Lanka
Saudi Arabia
Pakistan
Colombia
Singapore
Philippines
Chile
Jamaica
Mexico
13
Merger of ISO 13849 and IEC 62061
Do we need to care about ISO and IEC if we are in the US?
ENUL
ANSIGB
AS
GOST R
NR
JIS
14
Merger of ISO 13849 and IEC 62061
Why not go back to where we were? (Forget the complexity and the data)
15
Merger of ISO 13849 and IEC 62061
Why not go back to where we were? (Forget the complexity and the data)
“Trust me ……… I’m a safety relay”.
16
Merger of ISO 13849 and IEC 62061
Why not go back to where we were? (Forget the complexity and the data)
“Trust me ……… I’m a safety relay”.
FAULT TOLERANCE
DIAGNOSTICS SRS
RELIABILITY
SYSTEMATIC
FSM
We have to keep pace with changes in technology
and changes in risk
17
Merger of ISO 13849 and IEC 62061
Changes in technology and changes in risk
From “The human machine interface as an emerging risk”Risk Observatory: EU-OSHA – European Agency for Safety and Health at Work - ISBN-13: 978-92-9191-300-8
“Greater specialisation means that fewer workers are able to understand how to
work with the specific complex machine. Maintenance activities, in particular,
pose a challenge as a lot of complex systems need human assistance or
intervention. The design of many machines considers only operation under
normal conditions; as a consequence, when maintenance needs to be carried out,
risks related to such complex systems are not predictable and can be of different
nature.”
18
Merger of ISO 13849 and IEC 62061
Couldn’t we just go worst case? - Lets call everything PLe/SIL3
19
Merger of ISO 13849 and IEC 62061
Couldn’t we just go worst case? - Lets call everything PLe/SIL3
20
Merger of ISO 13849 and IEC 62061
Couldn’t we just go worst case? - Lets call everything PLe/SIL3
Safety requirement specification =
Integrity requirement (PL or SIL) and Functional requirement
21
Merger of ISO 13849 and IEC 62061
Where do we go from here?
22
Merger of ISO 13849 and IEC 62061
23
Merger of ISO 13849 and IEC 62061
Where do we go from here?
24
Merger of ISO 13849 and IEC 62061
Where do we go from here?
25
Merger of ISO 13849 and IEC 62061
Where do we go from here?
– No starting over …. Keep the same methodologies but learn
from experience
– Clarify and simplify where possible
– Resolve the data problems
– Don’t wait ……… Use the existing standards
26
Merger of ISO 13849 and IEC 62061
DC
Safety Related Subsystem Designer
(Safety Component Manufacturer)Safety Related System Designer
(Machine Builder)
SYSTEMATIC
SUBSYSTEM PFH CALCULATION
13849 Simplified method
Or
62061 Simplified method
CCF
SAFETY FUNCTION
SPECIFICATION
SUBSYSTEM
1 PFH
SUBSYSTEM
2 PFH
SUBSYSTEM
3 PFH
+
+
FUNCTIONAL SAFETY MANAGEMENTFUNCTIONAL SAFETY MANAGEMENT
ARCHITECTURE /
CATEGORY
SUBSYSTEM ELEMENTS
MTTF / λ
LOW COMPLEXITY
SUBSYSTEMS
HIGH COMPLEXITY SUBSYSTEMS
SUBSYSTEMS WITH FUNCTIONAL SAFETY PRODUCT STANDARD
USE IEC 61508 OR EQUIVALENT
E.G. IEC 61800-5-2
27
Merger of ISO 13849 and IEC 62061
• We have moved from a standard that was perceived as simple to use but
was restricted in terms of the technology it enabled, to standards that are
perceived as difficult to use but have enabled the confident use of new
technology.
• As part of the merging process we need to make sure that we do not
introduce any different or additional requirements. The merging should
be regarded as an opportunity for clarification, simplification and the
resolution of known issues such as the provision of reliability data.
It is now time to look for the best of both worlds.
Questions
28