Beckhoff EP7211-0034 Application Example
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Beckhoff EP7211-0034 Application Example

Sto function
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Application Example
EP7211-0034 - STO Function
Version:
Date:
1.0.0
2019-11-11

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Summary of Contents for Beckhoff EP7211-0034

  • Page 1 Application Example EP7211-0034 - STO Function Version: 1.0.0 Date: 2019-11-11...

  • Page 3: Table Of Contents

    2 Safety instructions ............................ 8 Delivery state ............................. 8 Operator's obligation to exercise diligence .................. 8 Description of instructions ......................... 9 3 STO function with EP7211-0034 (category 3, PL d)................ 10 Parameters of the safe input and output terminals ................ 11 Block formation and safety loops..................... 11 3.2.1 Safety function 1 ...................... 11 Calculation ............................ 12...
  • Page 4 Table of contents Version: 1.0.0 EP7211-0034 - STO Function...

  • Page 5: Foreword

    Product features Only the product features specified in the current user documentation are valid. Further information given on the product pages of the Beckhoff homepage, in emails or in other publications is not authoritative. Disclaimer The documentation has been prepared with care. The products described are subject to cyclical revision. For that reason the documentation is not in every case checked for consistency with performance data, standards or other characteristics.

  • Page 6: Documentation Issue Status

    Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or design. Delivery conditions In addition, the general delivery conditions of the company Beckhoff Automation GmbH & Co. KG apply. Documentation issue status Version Comment 1.0.0...

  • Page 7: Explanation Of Terms

    Training courses on functional safety can be taken at the corresponding certifying bodies such as the TÜV or at the responsible employer's liability insurance associations. Product training courses for the TwinSAFE components can be booked with the Beckhoff Training Depart- ment.

  • Page 8: Safety Instructions

    All the components are supplied in particular hardware and software configurations appropriate for the application. Modifications to hardware or software configurations other than those described in the documentation are not permitted, and nullify the liability of Beckhoff Automation GmbH & Co. KG. Operator's obligation to exercise diligence The operator must ensure that •...

  • Page 9: Description Of Instructions

    Damage to the environment/equipment or data loss Failure to follow this instruction can lead to environmental damage, equipment damage or data loss. Tip or pointer This symbol indicates information that contributes to better understanding. EP7211-0034 - STO Function Version: 1.0.0...

  • Page 10: Sto Function With Ep7211-0034 (Category 3, Pl D)

    STO function with EP7211-0034 (category 3, PL d) The following application example shows how the EP7211-0034 can be wired together with an EL2904 in order to implement an STO function according to EN 61800-5-2. A protective door (S1 and S2) and a restart signal (S3) are logically linked on an ESTOP function block. The EStopOut signal is transferred to the NC controller, which can be used within the functional application.

  • Page 11: Parameters Of The Safe Input And Output Terminals

    Wiring only with separate sheathed cable The wiring between the EL2904 and the STO input of the EP7211-0034 must be done with a separate sheathed cable in order to be able to assume a fault exclusion for the cross-circuit or external power supply of the wiring between EL2904 and EP7211-0034.

  • Page 12: Calculation

    STO function with EP7211-0034 (category 3, PL d) Calculation 3.3.1 PFHD / MTTFD / B10D – values Component Value EL1904 – PFH 1.11E-09 EL2904 – PFH 1.25E-09 EL6900 – PFH 1.03E-09 EP7211-0034 - PFH 0.00 S1 – B10 1,000,000 S2 – B10 2,000,000...
  • Page 13 STO function with EP7211-0034 (category 3, PL d) MTTF produces for 0,1* * (1 MTTF 1 0,99 1,68 679,3*8760 1 0,99 8, 4 1358,7 *8760 The following assumptions must now be made: The door switches S1/S2 are always actuated in opposite directions. Since the switches have different...
  • Page 14 STO function with EP7211-0034 (category 3, PL d) ELxxxx MTTF D ELxxxx ELxxxx Hence: (1 0,99) 0,01 1904) MTTF 1028,8 D EL 1904) 1,11 09 *8760 9,72 1904) (1 0,99) 0,01 6900) MTTF 1108,6 D EL 6900) 1,03 09 *8760 9,02 6900) (1 0,99)
  • Page 15 STO function with EP7211-0034 (category 3, PL d) CAUTION Category This structure is possible up to category 3 at the most. MTTF Designation for each channel Range for each channel 3 years ≤ MTTF < 10 years medium 10 years ≤ MTTF < 30 years high 30 years ≤...

  • Page 16: Appendix

    Beckhoff's branch offices and representatives Please contact your Beckhoff branch office or representative for local support and service on Beckhoff products! The addresses of Beckhoff's branch offices and representatives round the world can be found on her internet pages: http://www.beckhoff.com You will also find further documentation for Beckhoff components there.

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