ABB LLT100 Functional Safety Manual
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ABB LLT100 Functional Safety Manual

ABB LLT100 Functional Safety Manual

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L LT S I L F U N C T I O N A L S A F E T Y G U I D E
LLT100
Laser level transmitter

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Summary of Contents for ABB LLT100

  • Page 1 — L LT S I L F U N C T I O N A L S A F E T Y G U I D E LLT100 Laser level transmitter...
  • Page 2 ABB product catalogs, the latter takes precedence. ABB reserves the right to make changes to the specifications of all equipment and software, and contents of this document, without obligation to notify any person or organization of such changes. Every effort has been made to ensure that the information contained in this document is current and accurate.

  • Page 3: Table Of Contents

    Change record ............27 Reference documents ..........7 IEC-61508 certificate ........... 28 2 Description Instrument version ..........10 3 Designing an SIF using the LLT100 Safety function ............12 Alarm response and current output ... 12 Overall safety accuracy ........14 Restricted modes and parameters ....14 Behavior for undetected faults ....14...
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  • Page 5: Introduction

    Introduction The purpose of this safety manual is to provide information necessary to design, install, verify, and maintain a Safety Instrumented Function (SIF) utilizing the LLT100. This manual provides the necessary requirements for meeting the IEC 61508 functional safety standards.

  • Page 6: Acronyms

    Term Meaning Safety Freedom from unacceptable risk of harm. Safety Function A specified function that is performed by a safety-related system with the goal, under consideration of a defined hazardous incident, of achieving or maintaining a safe condition for the plant. Safety related system A safety related system performs the safety functions that are required to achieve or maintain a safe condition.

  • Page 7: Support

    Support Additional documentation on LLT100 is available for download free of charge at http://www.abb.com/laserlevel. Product support can be obtained by contacting ABB by one of the means indicated on the back cover of this manual. Applicable documents The following documentation must be available with the LLT100 and shall be read in addition to this safety manual.
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  • Page 9 C h A P T E R 2 Description The LLT100 is specifically made for industrial applications and harsh environments. It provides continuous, non-contact level measurement capabilities for process automation and inventory management in industries. It provides precise measurement of any solid or liquid independently from the material properties.

  • Page 10: Instrument Version

    Instrument version This safety manual applies to LIDAR sensor LLT100, with the most up to date revision in this table: Safety Release Number Release Date Software Version FPGA Version Release Notes 15 June 2018 1.01.03 1.01.03 Initial safety version restriction for combination of vessel height value ≤1.0 m,...

  • Page 11: Designing An Sif Using The Llt100

    Designing an SIF using the LLT100 Figure 1 shows a safety function example with the LLT100. The vessel level is monitored by the laser level transmitter. The LLT100 4–20 mA output loop is proportional to the level, ullage or volume of the vessel.

  • Page 12: Safety Function

    ≥21.0 mA (high alarm), with the exception of CPU faults where the current output is in low alarm mode (≤3.6 mA). There are other functionalities of the LLT100 that are not considered as part of the safety function: • Digital input (optional, external) •...
  • Page 13 The DCS loop must provide the required voltage level even if the current output operates on the configured HIGH alarm. The DCS shall be able to latch a detected High or Low Alarm, as the LLT100 alarm state may not be maintained after the alarm-triggering condition is not met anymore.

  • Page 14: Overall Safety Accuracy

    Refer to the Operating Manual (AD1) or data sheet AD2, for accurate information about environmental limits. Some limits depend on the model and accessories installed on it. Additional accessories can be used to help reduce the impact of dust or fog environment on the LLT100 measurement.

  • Page 15: Applications Limits

    Random integrity The LLT100 is a type B device. Therefore, based on the SFF ≥ 90%, when the LLT100 is used as the only component in a final element subassembly, a design can meet SIL 2 @ HFT=0. When the final element assembly consists of many components, the SIL must be verified for the entire assembly using failure rates from all components.
  • Page 16 In high demand mode, the end user shall comply with IEC61508-2 sections 7.4.5.3 and 7.4.5.4 for the failure rates to be applicable. If compliance to these specified sections is not met, the end user shall contact ABB (see back cover ot this document) to calculate failure rates that are appropriate.

  • Page 17: General Requirements

    General requirements The user shall verify that the LLT100 is suitable for use in safety applications by confirming that the LLT100 nameplate contains the CS label as part of the model identification code. An example of such a valid identification code is shown below: LLT100.AIAH10L5-E03.CS.P901...
  • Page 18 User Guide...

  • Page 19: Installation And Commissioning

    Instructions manual. Environmental parameters, such as temperature, pressure and dust level to name a few, must be checked to verify that they do not exceed the LLT100 ratings . As far as possible, the measuring setup should be free from critical ambient conditions such as large variations in temperature, vibrations, or shocks.

  • Page 20: Checklist Before Safety Operation

    Adding password protection To allow only authorized personnel to modify the LLT100 configuration, and therefore the safety function behavior, password protection must be added. 1 From the Device Setup menu, select Access Control > Advanced Password.

  • Page 21: Enabling/Disabling The Write Protection

    High/Low alarm configuration The LLT100 alarm state must be configured to ensure corresponding current value between the device and the DCS. The low alarm limit can be set from 3.5 to 3.6 mA and the high alarm limit between 21.0 and 21.6 mA.
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  • Page 23: Operation And Maintenance

    — C h A P T E R 5 Operation and maintenance Proof test without automatic testing In accordance with IEC 61508, the safety function of the measuring device must be checked at appropriate time intervals. The operator must determine the proof test interval and take this into account when determining the PFD value of the laser level transmitter.
  • Page 24 8 Set the output of the transmitter to a LOW-ALARM value by means of the push buttons of the HMI, HART communication by using the LLT100 DTM or with the Field Information Manager tool (FIM- Tool) using simulation function (menu: Diagnostics>Simulation Mode>Current Out).

  • Page 25: Software Updates

    Possible error messages If the LLT100 is malfunctioning in any way, the LCD displays specific error messages destined to help you identify and solve the problem. The chapter “Troubleshooting and service” of the Operating Instructions guide explain where the error summary appears and how to access the full details of the error.
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  • Page 27: Change Record

    — C h A P T E R 6 Document status Change record Version Date Change Description 18 June 2018 Initial release...

  • Page 28: Iec-61508 Certificate

    ABB 1704094 C001 history. hereby confirms that the: LLT100 Lidar Sensor The manufacturer may use the mark: Quebec, QC - Canada has been assessed per the relevant requirements of: IEC 61508 : 2010 Parts 1-7...
  • Page 29 (HFT) requirements. The following documents are a mandatory part of certification: 80 N Main St Assessment Report: ABB 17-04-094 R001 V1R0 Sellersville, PA 18960 Safety Manual: AA019031-01 Rev A LLT100 SIL Safety Manual T-013, V5R1 Page 2 of 2 Document status...
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  • Page 32 We reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB does not accept any responsibility whatsoever for potential errors or possible lack of information in this document.

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