1 / 13

PLC 5 and ControlLogix Subroutine Parameters

PLC 5 and ControlLogix Subroutine Parameters. Input Parameters Simple Example. Three variable frequency drives heat sink temperatures input to PLC Temperatures input in degrees Celsius Convert to degrees Fahrenheit and display on operator interface. Option #1 Ladder Conversion.

savannah-brady
Download Presentation

PLC 5 and ControlLogix Subroutine Parameters

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PLC 5 and ControlLogix Subroutine Parameters

  2. Input Parameters Simple Example • Three variable frequency drives heat sink temperatures input to PLC • Temperatures input in degrees Celsius • Convert to degrees Fahrenheit and display on operator interface

  3. Option #1 Ladder Conversion • Each time temperature input could add a rung to do calculations. • This would make ladder file longer. • More rungs • Slower scan

  4. Option #2 Subroutine Conversion • Put conversion instructions in a subroutine • Access subroutine each time conversion necessary • Less rungs in ladder • JSR input parameters used to move temperature data to subroutine

  5. JSR Instructions with Parameters

  6. Heat Sink Temperature from Three Different Sources • Drive node 21 temperature to F8:0 • Drive node 22 temperature to F8:1 • Drive node 23 temperature to F8:2

  7. JSR Sends Information to SBR JSR sends temperature information to SBR instruction input parameter address F8:10. Node 21, F8:0 temperature Node 22, F8:1 temperature Node 23, F8:2 temperature

  8. Subroutine Shares Data - F8:10 is where temperature is stored. - F8:10 data used in calculation

  9. CPT Destination Stores Result

  10. Result, F8:11 to RET Output Parameter

  11. Data Returned to JSR Data from RET instruction return parameter to JSR return parameter F8:12

  12. Data Flow Ladder 2 A D E C Ladder 3 B

  13. No Return Parameter Faults Processor

More Related