Rockwell Automation Allen-Bradley DM2 Application Technique
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Rockwell Automation Allen-Bradley DM2 Application Technique

Rockwell Automation Allen-Bradley DM2 Application Technique

Pneumatic safety valves safety function
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Application Technique
Pneumatic Safety Valves Safety Function
Products: GuardLogix Controller, E-stop Button, Safety I/O Module, DM
Safety Rating: CAT. 3, PLd to ISO 13849-1: 2008
Topic
Important User Information
General Safety Information
Introduction
Safety Function Realization: Risk Assessment
Pneumatic Safety Valves 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
2
Pneumatic Safety Valve
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Summary of Contents for Rockwell Automation Allen-Bradley DM2

  • Page 1 Application Technique Pneumatic Safety Valves Safety Function Products: GuardLogix Controller, E-stop Button, Safety I/O Module, DM Pneumatic Safety Valve Safety Rating: CAT. 3, PLd to ISO 13849-1: 2008 Topic Page Important User Information General Safety Information Introduction Safety Function Realization: Risk Assessment Pneumatic Safety Valves Safety Function Safety Function Requirements Functional Safety Description...

  • 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

    Pneumatic Safety Valves Safety Function General Safety Information Contact Rockwell Automation to learn more about our safety risk assessment services. IMPORTANT This application example is for advanced users and assumes that you are trained and experienced in safety system requirements.

  • Page 4: Safety Function Realization: Risk Assessment

    The safety function in this application technique meets or exceeds the requirements for Category 3, Performance Level d (CAT. 3, PLd), per ISO 13849-1 and control reliable operation per ANSI B11.19. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...

  • Page 5: Functional Safety Description

    24V DC and channel-to-channel shorts. If a fault occurs, either or both channels are set to low (0), and the controller reacts by dropping out the pneumatic safety valve. Only after the fault is cleared and the Reset button is pressed and released does the function block reset. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...
  • Page 6 Ready to Run (N.O. Contacts) and Fault Indicator (N.C. Contacts) are all wired to the 1734-IB8S module in this example. This configuration is not required for functional safety. These four inputs can be wired to a standard input module. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...

  • Page 7: Configuration

    I/O modules. Then, configure the I/O modules for the correct input and output types. A detailed description of each step is beyond the scope of this document. Knowledge of the RSLogix™ programming environment is assumed. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...
  • Page 8 In the Name box, type an appropriate name for the controller. d. Click OK. 3. In the Controller Organizer, add the 1768-ENBT module to the 1768 bus. 4. In the Select Module dialog box, select the 1768-ENBT module, and click OK. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...
  • Page 9 We used 192.168.1.8 for this application example. Yours can be different. 6. In the Controller Organizer, right-click 1768-ENBT module, and choose New Module. 7. In the Select Module dialog box, select the 1734-AENT adapter, and click OK. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...
  • Page 10 Chassis size is the number of modules that are inserted in the chassis. The 1734-AENT adapter is considered to be in slot 0, so for one input and one output module, the chassis size is 3. 10. In the Controller Organizer, right-click the PointIO 3 Slot Chassis adapter and choose New Module. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...
  • Page 11 Setting the output data to None means that you cannot use the Test Outputs as standard outputs, which is appropriate in this example. This configuration saves one controller connection, because we are using only the input connection. 14. Close the Module Properties dialog box by clicking OK. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...
  • Page 12 2. Click Input Configuration and configure the module as shown. 3. Click Test Output and configure the module as shown. 4. Click OK. 5. In the Controller Organizer, right-click the 1734-OB8S module and choose Properties. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...
  • Page 13 The safety application code in the safety output routine prevents outputs from restarting if the input channel resets automatically, which provides anti-tiedown functionality for the circuit reset. The input OK status is used as a permissive in the safety output routines. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...
  • Page 14 Configurable Redundant Output CROUT Zone1_Valve Feedback Type POSITIVE Feedback Reaction Time (Msec) Actuate Cmd_Zone1_OutputEnable Feedback 1 AENT:1:I.Pt07Data Feedback 2 AENT:1:I.Pt07Data Input Status AENT:1:I.CombinedInputStatus Output Status AENT:2:I.CombinedOutputStatus Reset Cmd_Zone1_FaultReset <AENT:1:I.Pt05Data> Zone1_Valve.O1 Zone1_Valve.O2 AENT:2:O.Pt00Data AENT:2:O.Pt01Data (End) Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...

  • Page 15: Calculation Of The Performance Level

    Subsystem 1 Subsystem 2 Subsystem 3 Subsystem 4 Subsystem 5 Subsystem 6 The SISTEMA calculations confirm that the proposed safety functions are capable of achieving the required level of protection CAT. 3, PLd. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...
  • Page 16 • Whether they are properly specified and installed (CCF) SISTEMA calculates the MTTFd by using B10d data provided in the Rockwell Automation® SISTEMA library for the E-stops along with the estimated frequency of use, entered during the creation of the SISTEMA project. This example presumes that the E-stops are operated or tested at least once a month, for a total of 12 times a year.

  • Page 17: Verification And Validation Plan

    Before validating the GuardLogix safety system, confirm that the safety system and safety application program have been designed in accordance with the GuardLogix Controller Systems Safety Reference Manual, publication 1756-RM093, and the GuardLogix Safety Application Instruction Set Safety Reference Manual, publication 1756-RM095. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...
  • Page 18 Verify proper machine-status indication and safety application program indication. Initiate a Stop command. The pneumatic safety valve de-energizes for a normal machine Stop condition. Verify proper machine-status indication and safety application program indication. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...
  • Page 19 While the system continues to run, short the valve feedback to the 24V DC. 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. Remove the short. Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...

  • Page 20: Additional Resources

    Also provides access to product support and literature Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1 Provides general guidelines on how to install a Rockwell Automation industrial system. Safety Products Catalog, publication S117-CA001 Provides information about Rockwell Automation safety products.
  • Page 21 Pneumatic Safety Valves Safety Function Notes: Rockwell Automation Publication SAFETY-AT128B-EN-P - July 2016...

  • Page 22: 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, LISTEN. THINK. SOLVE, POINT Guard I/O, POINT I/O, RSLogix, RSLogix 5000, Rockwell Automation, Rockwell Software, SensaGuard, and Stratix 2000 are trademarks of Rockwell Automation, Inc.

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