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

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

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6-24 ControlLogix I/O ModulesWiring the Analog Output Module in Current ModeIn addition to following the General Considerations when using AnyControlLogix Analog Output Module on page 6-20, consider thefollowing application guideline before wiring the 1756-OF8 module incurrent mode:• Placement of Other Devices in Current Loop: you can locateother devices in an output channel’s current loop anywhere aslong as the current source can provide sufficient voltage toaccommodate all of the voltage drops (each module output is250 ohms)Figure 6.18 shows how to wire the 1756-OF8 module for use incurrent mode.Figure 6.18 ControlLogix Analog Output Module Wiring in Current ModeAnalog Output ModuleAnalog Input Module(+)(+)Actuator(–)(–)43376Publication 1756-RM001B-EN-P - October 2003

ControlLogix I/O Modules 6-25Checklist for SIL InputsThe following checklist is required for planning, programming andstart up of SIL inputs. It may be used as a planning guide as well asduring proof testing. If used as a planning guide, the checklist can besaved as a record of the plan.For programming or start-up, an individual checklist can be filled infor every single SIL input channel in a system. This is the only way tomake sure that the requirements were fully and clearly implemented.This checklist can also be used as documentation on the connectionof external wiring to the application program.Input Check List for ControlLogix SystemCompany:Site:Loop definition:SIL input channels in the:No. All Input Module Requirements (apply to both digital and analog input modules) Yes No Comment1 Is Exact Match selected as the electronic keying option for all modules?2 Is the RPI value set to an appropriate value for your application?3 Are all modules owned by the same controller?4 Have you performed proof tests on the system and modules?5 Have you set up the fault routines?6 Are control, diagnostics and alarming functions performed in sequence in application logic?No. Additional Digital Input Module-Only Requirements Yes No Comment1 When two digital input modules are wired in the same application, do the following conditions exist:• Both modules are owned by the same controller.• Sensors are wired to separate input points.• The operational state is ON.• The non-operational state is. OFF.• Configuration parameters (for example, RPI, filter values) are identical.2 For the standard input modules, is the Communication Format set to one of the Input Data choices?3 For the diagnostic input modules, is the Communication Format set to Full Diagnostics-Input Data?4 For the diagnostic input modules, are all diagnostics enabled on the module?5 For the diagnostic input modules, are enabled diagnostic bits monitored by fault routines?6 For the diagnostic input modules, is the connection to remote modules a direct connection?No. Additional Analog Input Module-Only Requirements Yes No Comment1 Is the Communication Format set to Float Data?2 Have you calibrated the modules as often as required by your application?3 Are you using ladder logic to compare the analog input data on two channels to make sure there isconcurrence within an acceptable range and that redundant data is used properly?4 Have you written application logic to examine bits for any condition that may cause a fault andappropriate fault routines to handle the fault condition?5 When wiring the 1756-IF8 in voltage mode, are transmitter grounds tied together?6 When wiring the 1756-IF8 in current mode, are loop devices placed properly?7 When wiring 1756-IT6I modules in parallel, have you wired to the same channel on each module asshown in Figure 6.14 on page 6-18?8 When wiring two 1756-IR6I modules, are two sensors used, as shown in Figure 6.15 on page 6-19?Publication 1756-RM001B-EN-P - October 2003

6-24 <strong>ControlLogix</strong> I/O ModulesWir<strong>in</strong>g the Analog Output Module <strong>in</strong> Current ModeIn addition to follow<strong>in</strong>g the General Considerations when us<strong>in</strong>g Any<strong>ControlLogix</strong> Analog Output Module on page 6-20, consider thefollow<strong>in</strong>g application guidel<strong>in</strong>e before wir<strong>in</strong>g the <strong>1756</strong>-OF8 module <strong>in</strong>current mode:• Placement of Other Devices <strong>in</strong> Current Loop: you can locateother devices <strong>in</strong> an output channel’s current loop anywhere aslong as the current source can provide sufficient voltage toac<strong>com</strong>modate all of the voltage drops (each module output is250 ohms)Figure 6.18 shows how to wire the <strong>1756</strong>-OF8 module for use <strong>in</strong>current mode.Figure 6.18 <strong>ControlLogix</strong> Analog Output Module Wir<strong>in</strong>g <strong>in</strong> Current ModeAnalog Output ModuleAnalog Input Module(+)(+)Actuator(–)(–)43376Publication <strong>1756</strong>-<strong>RM001B</strong>-<strong>EN</strong>-P - October 2003

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