Creation of Functions for Failure Modes %26 Effects Analysis – Generation of Risk Priority Number...

7/28/2019 Creation of Functions for Failure Modes %26 Effects Analysis Generation of Risk Priority Number (RPN)

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Creation of Functions for FailureModes & Effects Analysis Generation of Risk Priority Number(RPN)

Appl ies to:

SAP QM/PLM Consultants, SAP ECC 6.0.EHP3.

For more information, visit the Supply Chain Management homepage.

Summary

Failure Modes and Effects Analysis is an analytical method for locating and preventing possible defects andweak points in products and processes early on. FMEA component provides functions that you can be used

to perform a Failure Mode and Effects Analysis.

Author : Phani Kumar Adavi

Company: Intelligroup Asia Private Ltd

Created on: 20 August 2009

Author Bio

Phani Kumar Adavi has Eight years of Experience which includes Four years of Experiencein SAP Quality Management QM Module. He has been working as Consultant for SAP QMModule, in SAP SCM Department of Intelligroup Asia Pvt Ltd since September 2008.

SAP COMMUNITY NETWORK SDN - sdn.sap.com | BPX - bpx.sap.com | BOC- boc.sap.com

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Creation of Functions for Failure Modes & Effects Analysis Generation of Risk Priority Number (RPN)

Introduction

FMEA is used in Quality Management to prevent and avoid Defects. Six sigma projects use failure modesand effects analysis to identify the weak points. FMEA component supports different styles of FMEA.

For Example System FMEA for products & processes.

Every Functional element which is part of FMEA structure is investigated for Defect probabilities, defectcauses & effects.

Abbreviations Used

TC Transaction Code

FMEA Failure Modes & Effects Analysis

RPN Risk Priority Number

Requirement

To determine the RPN for each possible defect by valuating the effect and weighing this together with thevaluation of Probability that the defect will actually cause a malfunction or breakdown.

Locating & Preventing possible defects and weak points in products as well as processes early on. FMEA in

Quality Management is used to prevent and avoid defects. Six Sigma projects can use the FMEA foridentification of weak points.

Integration

FMEA integrates with the following Components:

Catalogs (TC: QS41)

Inspection Characteristics (TC: QS21)

Structure of the Failure Modes and Effects Analysis

The Function and Defect Network is linked as follows in FMEA.

(81) System FMEA Process (80) Functions 800 Function List801 Function(802) Prerequisite(806) Characteristic(803) Defect (804) Reason(8000) Probability of Occurrence(8001) Probability of Detection (805) Result


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Structure of the Hierarchy profile & Hierarchy Levels

S.No. HierarchyProfile

ProfileDescription

ListType/HierarchyLevel

Description ItemType

ItemDescription

1 80 Functions 010 Functions 800 Functions List

1 Function 801 Function

2 Prerequisite 802 Prerequisi te

3 Characteristic 806 Characteristic

4 Defect 803 Defect

5 Cause 804 Reason

6 Characteristic 806 Characteristic

7 Effect 805 Result


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Procedure

The Creation & Execution of the FMEA majorly involves the following steps:

Step 1:Creating Structure, Function & defect Networks (Structure Analysis)

Step 2:Assigning Characteristics

Step 3:Creating Actions

Step 4:Assignment of the Control Plan.Step 5:Evaluating the Defects causes & Actions. (Action & Risk Analysis)

Step 6:Print preview of FMEA with Risk Priority Numbers for Defects

TC QM_FMEA (FMEA Cockp it) is used for the creation o f FMEA.Step 1: Creation of Structure, Function and Defect Networks

Enter the FMEA Type & objects pertaining to FMEA type i.e. Material & Process operation. Enter the details like Planned Start Date, finish Date, person responsible & approver. Status of FMEA is to be released for further actions. In the Control Plan Tab system displays the relevant Control Plans to which FMEA is attached. Create the Functions List & assign the Function or Process Operation Step from the Task List that is

assigned in the initial step of FMEA Creation Assign the Prerequisites that need to be followed during the Execution of the Process

Step/Operation assigned in FMEA. Create & Assign the Probable Defects to the Function or Process Step.


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Step 2: Assign the Master Inspection Characteristics

Give the Description for the Characteristic, characteristic type & weighting. Description of the Characteristic should be unique. Assign the Master Inspection Characteristic and plant which is a part of the FMEA.

Step 3: Create Preventive and Detection Actions

Create Preventive and Detection Actions with reference to the Defect. Give the Planned Start Date details. Ensure to confirm the Preventive and Detection Actions to update the valuations of Probability of

Occurrence & Detection that are required for the Calculation of Risk Priority Number.


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Step 4: Assign FMEA to the Control Plan

Create Control Plan for FMEA. Assign FMEA in the FMEA Tab of Control Plan. Transfer of Data takes place from FMEA to Control Plan & vice versa.


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Step 5: Carry out Action & Risk Analysis by Evaluating the Defect Causes & Actions

Formula for calculating RPN = Severity X Probability of Occurrence X Probability of Detection. Enter the Severity of Defect along with the Probability of Occurrence & Probability of Detection

Ratings. Click on the valuate Tab that triggers the Calculation of Risk Priority Number for the Defects.

Severity (4) X Probability o f Occurrence (6) X Probability of Detection (6) = RPN (144)

RPN value in the Defects screen of FMEA


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Step 6 Print preview of FMEA with Risk Priority Numbers for Defects

Note: As the concept is already simulated and executed in the system all the screenshots pertaining to the scenario arereferenced here in Change mode of the transaction.


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Summary

In case of Multiple Defects or weak points identified for a process or product, depending on the severity ofthe defect, system will generate the Risk Priority Number which is directly proportional to severity.

Depending upon the Risk Priority Number of Defect, necessary Actions are prioritized to prevent & avoid thedefects/non conformities.

In FMEA, causes from the Lower level system Element & Effects from the Higher Level system Element are

linked to the Defects to establish the Cause Effect Relationship.Thus Actions to reduce the projected risk for the whole system are aimed at the potential defects with thehighest risk priority number.

Related Content




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Disclaimer and Liabili ty Notice

This document may discuss sample coding or other information that does not include SAP official interfaces and therefore is notsupported by SAP. Changes made based on this information are not supported and can be overwritten during an upgrade.

SAP will not be held liable for any damages caused by using or misusing the information, code or methods suggested in this document,and anyone using these methods does so at his/her own risk.

SAP offers no guarantees and assumes no responsibility or liability of any type with respect to the content of this technical article orcode sample, including any liability resulting from incompatibility between the content within this document and the materials andservices offered by SAP . You agree that you will not hold, or seek to hold, SAP responsible or liable with respect to the content of thisdocument.

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