1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com

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A-2 Response Times in ControlLogixEXAMPLEFor example, a system may reflect the set-up used inFigure A.1 with an 1756-IB16D and 1756-OB16D andfollowing settings:• Input Module Filter Setting = 1ms• Input Module Hardware Delay = 1ms• Input RPI = 2ms• Program Scan = 20ms• Output Module Hardware Delay = 1msIn this example, the worst-case reaction time = 25msRemote Chassis ConfigurationFigure A.2 shows an example system where the following occurs:• input data changes on the digital input module• the data is transmitted to the controller via the 1756-CNBmodules• the controller runs its program scan and reacts to the datachange, including sending new data to the output module viathe 1756-CNB modules• the output module behavior changes based on the new datareceived from the controllerFigure A.2ControllerControlNetBridge ModuleControlNetBridge ModuleDigital InputModuleDigital OutputModulePublication 1756-RM001B-EN-P - October 2003
Response Times in ControlLogix A-3Use the following formula to determine worst-case reaction time:Worst-Case Reaction Time =Input Module Filter Setting (1) + Input Module Hardware Delay (2)+ Input Module RPI (1) + Remote 1756-CNB RPI + Controller Program Scan (3)+ Remote 1756-CNB RPI + Output Module Hardware Delay (2)(1)This setting is user-defined. For more information, see the ControlLogix Digital I/O Modules user manual, publication 1756-UM058.(2) Hardware delay is module-dependent. Specific hardware delay times are listed in the installation instructions for each catalog number.For a complete list of installation instructions, see Table 1.1 on page 1-6.(3)This figure is calculated by adding instruction execution times. For more information on instruction execution times in RSLogix 5000, seethe Logix5000 Controllers Execution Time and Memory Use Reference, publication 1756-RM087.Analog ModulesLocal Chassis ConfigurationFigure A.3 shows an example system where the following occurs:• input data changes on the analog input module• the data is transmitted to the controller• the controller runs its program scan and reacts to the datachange, including sending new data to the output module• the output module behavior changes based on the new datareceived from the controllerFigure A.3Analog InputModuleControllerAnalog OutputModuleUse the following formula to determine worst-case reaction time:Worst-Case Reaction Time =Input Module Filter Setting (1) + Input Module Real Time Sample (RTS) rate (1)+ Controller Program Scan (2) +Output Module RPI (1)+ Output Module Hardware Delay (3)(1)(2)(3)This setting is user-defined. For more information, see the ControlLogix Digital I/O Modules user manual, publication 1756-UM058.This figure is calculated by adding instruction execution times. For more information on instruction execution times in RSLogix 5000, see theLogix5000 Controllers Execution Time and Memory Use Reference, publication 1756-RM087.Hardware delay is module-dependent. Specific hardware delay times are listed in the installation instructions for each catalog number. Fora complete list of installation instructions, see Table 1.1 on page 1-6.Publication 1756-RM001B-EN-P - October 2003
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Using ControlLogixin SIL2 Applicati
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2-6 The ControlLogix SystemSoftware
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4-2 ControlLogix ControllerRecommen
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5-2 ControlLogix Communications Mod
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Page 100 and 101: B-2 System Self-Testing and User-Pr
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Page 104 and 105: D-2 Spurious Failure EstimatesNotes
Page 106 and 107: E-2 Sample Probability of Failure o
Page 108 and 109: E-4 Sample Probability of Failure o
Page 110: 2 IndexMMean time between failures
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