Functional Safety
Reliability Data (MTTF)
for XM100
www.danfoss.com
Functional Safety
Reliability data (MTTF) for XM100
Revision history Table of revisions
Date Changed Rev
January 2021 First Edition 0101
2 | © Danfoss | January 2021 BH409064980476en-000101
Functional Safety
Reliability data (MTTF) for XM100
Contents
Overview
Reliability Data (MTTF/MTTFd).................................................................................................................................................... 4
Standards and references
Introduction........................................................................................................................................................................................5
Assumptions.......................................................................................................................................................................................5
Standards.............................................................................................................................................................................................5
Calculations........................................................................................................................................................................................ 5
XM100 Component and calculation summary
Terms and definitions
PFH and FIT.........................................................................................................................................................................................7
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Functional Safety
Reliability data (MTTF) for XM100
Overview
Reliability Data (MTTF/MTTFd)
General
The Mean Time to Failure (MTTF) and Mean Time to dangerous Failure (MTTFd) data included in this
document was compiled by Danfoss engineering and experts with the technical expertise to determine
the MTTF/MTTFd data for the product based on the standards set in place by the industry.
The purpose of this document is to assist in the transfer of MTTF and MTTFd data for the product from
Danfoss to the appropriate party in a way which will result in a clear understanding of the product
reliability information. MTTF and MTTFd information is provided to assist in calculating the overall MTTF/
MTTFd of a complete or partially complete piece of machinery. MTTFd information may be required for
functions where a failure can lead to a dangerous situation. The different methods used to calculate
MTTFd values for specific functions are shown in .
If the related product/subsystem is not explicitly mentioned to be a Safety Product, it is developed
according to common quality principles (ISO 9001). Therefore, the can only be used as standard part
within a Safety Function.
Disclaimer
Danfoss cannot be held responsible for the suitability of these calculated MTTF/MTTFd values for use in
the calculation of the overall machinery MTTF/MTTFd values.
The MTTF/MTTFd values for the transmissions are based on a specific machine use, specific functions,
operating environment, and/or duty cycle as stated by the standards set in place by the industry and/or
Danfoss. This communication along with any attached Danfoss drawings, sketches, or data is transmitted
in confidence. No information stated in this document or any attachments or supplements may be
reproduced or disclosed in whole or in part without written permission of Danfoss. Further, neither these
documents nor any attachments are a warranty of any sort by Danfoss or a guarantee of machine
suitability for its intended purpose. It remains the responsibility of the machine manufacturer to ensure
overall machine functionality and overall machine safety.
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Functional Safety
Reliability data (MTTF) for XM100
Standards and references
Introduction
As of December 29, 2009, Machinery Directive 2006/42/EC is effective for all machinery placed on the
market in the European community. This directive mandates that machinery manufacturers are
responsible for performing and documenting a Hazard and Risk Assessment. Each identified risk must
then be addressed to ensure risk reduction to an acceptable risk level.
The processes to guide the execution of these activities are defined in various harmonized standards
such as:
•
ISO 12100:2010 Safety of Machinery
General principles for design
‒
Risk assessment and risk reduction
‒
•
ISO 13849 Safety of Machinery
Safety-related parts of control systems
‒
Danfoss adds value by participating in the machine manufacturers process and providing the appropriate
product information to enable the required probabilistic calculations.
Assumptions
The failure rate listed in this document is the result of a FMEDA analysis.
All failure rates were calculated using component data from MIL-HDBK-217F at 45°C, unless otherwise
noted. All failure mode distributions were taken from IEC 62061:2005 Annex D.
For inputs, a failure included in MTTFd and PFH is categorized as a mismatch between expected and
measured signal.
For logic and outputs, failure included in MTTFd and PFH is categorized as one that causes:
•
Loss of high-side switch turn-off capability
•
Uncommanded turn-on of high-side switch
•
A mismatch between commanded and actual current (for proportional outputs only)
Analysis should be performed, taking into account if not all components fail dangerously.
Standards
IEC 61508:2006
IEC 62061:2005 Annex D
MIL-HDBK-217F
Calculations
Probability does not consider CAN communication external issues.
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PLUS+1® microcontroller hardware category - Type B device
Failure modes and percentages
Reliability prediction of electronic equipment
Functional Safety
Reliability data (MTTF) for XM100
XM100 Component and calculation summary
Per Function Data
Function (Configuration) Function
MTTF [years] MTTFd [years]
(Configuration)
[internal name]
DIN/AIN/FreqIN/ResIN/CrntN (Digital) DAFRC3 (Digital) 4,560.2 4,560.2 18%
DIN/AIN/FreqIN/ResIN/CrntN (Analog) DAFRC3 (Analog) 4,303.8 4,303.8 17%
DIN/AIN/FreqIN/ResIN/CrntN (Frequency) DAFRC3
4,347.5 4,418.7 17%
(Frequency)
DIN/AIN/FreqIN/ResIN/CrntN (Rheostat) DAFRC3 (Rheostat) 3,994.1 3,999.2 16%
DIN/AIN/FreqIN/ResIN/CrntN (Current) DAFRC3 (Current) 3,808.9 3,816.8 15%
DIN/AIN/CANx SHIELD (Analog) DA3 (Analog) 14,519.7 14,519.7 5%
DIN/AIN/CANx SHIELD (Digital) DA3 (Digital) 17,972.4 17,972.4 6%
DIN (Digital) D2 (Digital) 18,850.1 18,850.1 0%
GNSS GNSS 118.1 118.8 92%
Power and Logic
Power and Logic Power and Logic 29.6 30.5 97%
Output
DOUT DOUT14 1,231.9 3,083.7 45%
Sensor PWR 5V_SNSR3 8,380.6 9,548.0 74%
Audio Audio 9,178.3 11,780.9 90%
#N/A 0 2,860.2 2,860.2 97%
#N/A 0 8,554.5 9,638.9 47%
#N/A 0 1,646.9 1,665.9 96%
*
Assume worst case scenario where all failures are determined to be "Dangerous if the failure causes any change in device functionality
*
ISO 13849
Diagnostic
Coverage [%]
Device Total
IEC 61508
Safe Failure Fraction
[%]
1
S
2
DD
3
DU
‡
SFF
*
Assume worst case scenario where all failures are determined to be "Dangerous if the failure causes any change in device functionality
1
Safe Failure
2
Dangerous Detected Failure
3
Dangerous Undetected Failure
‡‡
DC is the ratio of the rate of detected dangerous failures compared to the rate of all dangerous failures
‡
SFF is the probibility of failing in a safe state
1.13E-07 DD
4.66E-06 DU
3.31E-07 DC
93.52
ISO 13849
Diagnostic Coverage
[%]
2
3
‡‡
4.66E-06 22.4 22.9
3.31E-07
93.37
MTTF [years] MTTF*[years]
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Functional Safety
Reliability data (MTTF) for XM100
Terms and definitions
PFH and FIT
Failure rate per operational hour is also referred to as lambda.
PFH / lambda (Probability Failure Hour) = 1/MTTF (years) * 365 * 24
FIT (Failure In Time) = 1/MTTF (hours) * 10e-9
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Danfoss
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