Rockwell Automation Allen-Bradley GuardLogix Application Technique
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Rockwell Automation Allen-Bradley GuardLogix Application Technique

Rockwell Automation Allen-Bradley GuardLogix Application Technique

Safety function: light curtain with optical sensors and a controller, safety light curtain, photoelectric sensor, compact controller, safety rating: cat. 4, ple to iso 13849-1: 2008
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Application Technique
Safety Function: Light Curtain with Optical Sensors and a
GuardLogix® Controller
Products: GuardShield® Safety Light Curtain, Photoelectric Sensor, Compact GuardLogix Controller
Safety Rating: CAT. 4, PLe to ISO 13849-1: 2008
Topic
Important User Information
General Safety Information
Introduction
Safety Function Realization: Risk Assessment
Light Curtain Safety Function
Safety Function Requirements
Functional Safety Description
Bill of Material
Setup and Wiring
Configuration
Calculation of the Performance Level
Verification and Validation Plan
Additional Resources
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Summary of Contents for Rockwell Automation Allen-Bradley GuardLogix

  • Page 1 Application Technique Safety Function: Light Curtain with Optical Sensors and a GuardLogix® Controller Products: GuardShield® Safety Light Curtain, Photoelectric Sensor, Compact GuardLogix Controller Safety Rating: CAT. 4, PLe to ISO 13849-1: 2008 Topic Page Important User Information General Safety Information Introduction Safety Function Realization: Risk Assessment Light Curtain Safety Function...

  • Page 2: Important User Information

    If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

  • Page 3: General Safety Information

    ATTENTION: Perform a risk assessment to make sure that all task and hazard combinations have been identified and addressed. The risk assessment can require additional circuitry to reduce the risk to a tolerable level. Safety circuits must consider safe distance calculations. Contact Rockwell Automation to learn more about our safety-risk assessment services. Safe Distance Calculations ATTENTION: Compliant safety circuits must often consider a safe distance or access time calculation.

  • Page 4: Safety Function Realization: Risk Assessment

    3. Determination of required PL (PLr) for each safety function To: Realization and PL Evaluation Light Curtain Safety Function This application technique describes the operation of a light curtain with muting functionality. There is no muting override in this example. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...

  • Page 5: Safety Function Requirements

    A properly-muted light curtain can be broken without dropping out the safety contactors. When the light curtain is muted, the muting lamp is energized. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...

  • Page 6: Bill Of Material

    The muting sensors are high (1) when the sensors are not blocked. If any fault occurs, such as a wire being off, the fault causes one of the muting sensors to go low (0) in an improper muting sequence, then the controller reacts by dropping out the safety contactors. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 7 The safety task period accounts for the possibility that the asynchronous scan just ended when the input changed state. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 8 C = 8 (d - 14) but not less than 0, where d is the resolution of the light curtain S = 1600 x 1.017 + 8(14 - 14) The light curtain must not be mounted closer than 1628 mm (approx. 64 in.) from the hazardous motion being guarded against. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...

  • Page 9: Timing Chart

    Muting Lamp t3: Maximum Mute Time t2: S2 - LC Time t1: S1-S2 Time t2: S2-LC Time t1: S1 - S2 Time Restart Type = Manual t3: Maximum Mute Time Restart Type = Manual Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 10 Safety Reset Fault Reset Brown Black Transmitter Receiver Blue Brown Black Blue *Muting Lamp *The 24V DC Common wires for the two G lamps are not shown. 24V DC Common *Clear Area Lamp Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...

  • Page 11: Configuration

    Knowledge of the RSLogix™ programming environment is assumed. Configure the Controller and Add I/O Modules Follow these steps to configure the controller and add I/O modules. 1. In RSLogix 5000 software, create a project. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 12 4. Name the module, type its IP address, and click OK. We used 192.168.1.8 for this application example. Yours may be different. 5. Add the 1734-AENT adapter by right-clicking the 1768-ENBT module in the Controller Organizer and choosing New Module. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 13 6. Select the 1734-AENT adapter and click OK. 7. Name the module, type its IP address, and click OK. We used 192.168.1.11 for this application example. Yours may be different. 8. Click Change. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 14 10. In the Controller Organizer, right-click the 1734-AENT adapter and choose New Module. 11. Expand Safety, select the 1734-IB8S module, and click OK. 12. In the New Module dialog box, name the device IB8S, and click Change. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 15 14. Close the Module Properties dialog box by clicking OK. 15. Repeat steps 10…14 to add the 1734-OB8S safety output module. 16. Name the module OB8S. This module is in slot 2, and Combined Status-Readback-Power is selected for Input Status. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 16 Input 7 is the contactor-monitoring circuit. Recall that input 7 is being sourced from Test Output 2. There is no difference when an input channel is configured for safety or standard. It is used or documentation. 4. Click OK. 5. In the Controller Organizer, right-click the 1734-OB8S module, and choose Properties. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 17 The output of the TSAM instruction is used as a safety interlock in the seal-in rung to drive the output enable tag. If the DCS output drops out, so does the output enable, and it remains off until a manual reset action is conducted. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 18 Sensor 2 AENT:1:I.Pt03Data Enable Mute Zone1_LC_Mute_Enable Override NO_override Input Status AENT:1:I.CombinedInputStatus Muting Lamp Status A ENT:1:I.Muting03Status Reset AENT:1:I.Pt05Data AENT:1:I.Pt04Data One Shot Falling Storage Bit Wrk_Zone1_OSF Output Bit Wrk_Zone1_FallingEdge Wrk_Zone1_FallingEdge Zone1_TSAM.O1 Zone1_K1K2.FP Cmd_Zone1_OutputEnable Cmd_Zone1_OutputEnable Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...

  • Page 19: Calculation Of The Performance Level

    The functional safety specifications of the project call for a minimum structure of CAT. 3 and a minimum Performance Level of PLd. A PFHd of less than 1.0 E-06 for the overall safety function is required for PLd. The overall safety function value is shown below. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 20 The CCF value is generated by using the scoring process outlined in Annex F of ISO 13849-1. The complete CCF scoring process must be performed when actually implementing an application. A minimum score of 65 must be achieved. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...

  • Page 21: Verification And Validation Plan

    Verify that the safety system has been designed in accordance with the GuardLogix Controller Systems Safety Reference Manual, publication 1756-RM093. Verify that the safety application program has been designed in accordance with the GuardLogix Safety Application Instruction Set Safety Reference Manual, publication 1756-RM095. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 22 While the system continues to run, remove the muting sensor 1 wire from the safety I/O. Both contactors de-energize. Verify proper machine status indication and safety application program indication. Restore sensor 1 and repeat for sensor 2. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 23 While the system continues to run, short the contactor feedback to the safety I/O. All contactors remain energized. Initiate a Stop command and attempt a Reset command. The system does not restart or reset. Verify proper machine status indication and safety application program indication. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...

  • Page 24: Additional Resources

    Provides declarations of conformity, certificates, and other certification details. certification/overview.page You can view or download publications at http://www.rockwellautomation.com/literature/. To order paper copies of technical documentation, contact your local Allen-Bradley distributor or Rockwell Automation sales representative. Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...
  • Page 25 Safety Function: Light Curtain with Optical Sensors and a GuardLogix® Controller Notes: Rockwell Automation Publication SAFETY-AT057C-EN-P - April 2016...

  • Page 26: Rockwell Automation Support

    Rockwell Automation maintains current product environmental information on its website at http://www.rockwellautomation.com/rockwellautomation/about-us/sustainability-ethics/product-environmental-compliance.page. Allen-Bradley, CompactLogix, GuardLogix, GuardShield, LISTEN. THINK. SOLVE, POINT Guard I/O, POINT I/O, RSLogix, RSLogix 5000, RightSight, Rockwell Automation, Rockwell Software, SensaGuard, and Stratix 2000 are trademarks of Rockwell Automation, Inc.

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