Additionally, the following parts may belong to the documentation, if applicable: • EU-type examination certificate • EU declaration of conformity • Attestation of conformity • Certificates • Control drawings • FMEDA report • Assessment report • Additional documents For more information about Pepperl+Fuchs products with functional safety, see www.pepperl-fuchs.com/sil.
Functional Safety MFT-***.****(.L) Introduction Safety Information Target Group, Personnel Responsibility for planning, assembly, commissioning, operation, maintenance, and dismounting lies with the plant operator. Only appropriately trained and qualified personnel may carry out mounting, installation, commissioning, operation, maintenance, and dismounting of the product. The personnel must have read and understood the instruction manual and the further documentation.
Functional Safety MFT-***.****(.L) Introduction Symbols Used This document contains symbols for the identification of warning messages and of informative messages. Warning Messages You will find warning messages, whenever dangers may arise from your actions. It is mandatory that you observe these warning messages for your personal safety and in order to avoid property damage.
Functional Safety MFT-***.****(.L) Product Description Product Description Function Danger! Danger to life from wrong usage of the device The protection of the safety loop is not the safety function of the device. The statement concerning the safety function of the device solely describes the effect on safety loops in which the device is installed.
Functional Safety MFT-***.****(.L) Product Description Marking Pepperl+Fuchs Group Lilienthalstraße 200, 68307 Mannheim, Germany Internet: www.pepperl-fuchs.com Multifunction Terminal Up to SIL 3 MFT-R.****, MFT-2R.****, MFT-D****(.L), MFT-2D.****, MFT-F.****(.L), MFT-2F.****, MFT-2L.****, MFT-FT.****, MFT-RNO.****, MFT-RNC.****, MFT-BASE.*P The *-marked letters of the type code are placeholders for versions of the device.
Functional Safety MFT-***.****(.L) Planning Planning System Structure 3.1.1 Low Demand Mode of Operation If there are two control loops, one for the standard operation and another one for the functional safety, then usually the demand rate for the safety loop is assumed to be less than once per year.
Functional Safety MFT-***.****(.L) Planning Assumptions The following assumptions have been made during the FMEDA: • Failure rate based on the Siemens standard SN 29500. • Failure rates are constant, wear is not considered. • External power supply failure rates are not included. •...
Functional Safety MFT-***.****(.L) Planning Safety Function and Safe State The device transfers signals from the field side to the control side or vice versa. The transferred signals are evaluated as: • analog input (AI) • analog output (AO) • digital input (DI) •...
Functional Safety MFT-***.****(.L) Planning Characteristic Safety Values 1oo1 Structure Parameters Characteristic values Assessment type and FMEDA report documentation Device type Mode of operation Low demand mode or high demand mode Safety function Pass through the signal Signal type Analog signal (AI, AO) or digital signal (DI, DO) Device version MFT-R.**** MFT-2R.****...
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Functional Safety MFT-***.****(.L) Planning Parameters Characteristic values Assessment type and FMEDA report documentation Device type Mode of operation Low demand mode or high demand mode Safety function Pass through the signal Signal type Analog signal (AI, AO) or digital signal (DI, DO) Device version MFT-2D.0500 MFT-F.****...
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Functional Safety MFT-***.****(.L) Planning Parameters Characteristic values Assessment type and FMEDA report documentation Device type Mode of operation Low demand mode or high demand mode Safety function Pass through the signal Signal type Analog signal (AI, AO) or digital signal (DI, DO) Device version MFT-2L.**** MFT-RNC-0006...
Functional Safety MFT-***.****(.L) Planning Useful Lifetime Although a constant failure rate is assumed by the probabilistic estimation this only applies provided that the useful lifetime of components is not exceeded. Beyond this useful lifetime, the result of the probabilistic estimation is meaningless as the probability of failure significantly increases with time.
Functional Safety MFT-***.****(.L) Mounting and Installation Mounting and Installation Mounting and Installing the Device Observe the safety instructions in the instruction manual. Observe the information in the manual. Observe the requirements for the safety loop. Connect the device only to devices that are suitable for this safety application. Check the safety function to ensure the expected output behavior.
If the output shutdown is put out of service, the safety function is no longer guaranteed. Prevent the access to the DIP switches and the manipulation of the output shutdown during operation. Use the Pepperl+Fuchs switch protection cover as described in the documentation. Operating the device Observe the safety instructions in the instruction manual.
Report all failures in the safety function that are due to functional limitations or a loss of device function – especially in the case of possible dangerous failures. In these cases, contact your local sales partner or the Pepperl+Fuchs technical sales support (service line).
Functional Safety MFT-***.****(.L) Application Examples Application Examples This chapter shows how to integrate a multifunction terminal into a safety loop. Integration of a Multifunction Terminal into a Safety Loop To define and calculate the safety relevant values for a safety loop, you have to determine the following basic parameters first: 1.
Functional Safety MFT-***.****(.L) List of Abbreviations List of Abbreviations Emergency Shutdown Failure In Time in 10 Failure Mode, Effects, and Diagnostics Analysis FMEDA Probability of safe failure Probability of dangerous detected failure Probability of dangerous undetected failure Probability of failures of components in the safety loop that have ...
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