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BRX Technical Training

BRX Technical Training. Interrupts. Interrupts. BX10 6 discrete IN ( all high-speed ) 4 discrete OUT (2 high-speed) No analog IN No analog OUT No Ethernet port BX10E 6 discrete IN ( all high-speed ) 4 discrete OUT (2 high-speed) 1 analog IN 1 analog OUT Ethernet port. Interrupts.

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BRX Technical Training

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  1. BRX Technical Training Interrupts

  2. Interrupts • BX10 • 6 discrete IN (all high-speed) • 4 discrete OUT (2 high-speed) • No analog IN • No analog OUT • No Ethernet port • BX10E • 6 discrete IN (all high-speed) • 4 discrete OUT (2 high-speed) • 1 analog IN • 1 analog OUT • Ethernet port

  3. Interrupts • BX18 • 10 discrete IN (all high-speed) • 8 discrete OUT (4 high-speed) • No analog IN • No analog OUT • No Ethernet port • BX18E • 10 discrete IN (all high-speed) • 8 discrete OUT (4 high-speed) • 1 analog IN • 1 analog OUT • Ethernet port

  4. Interrupts • BX36 • 20 discrete IN (10 high-speed) • 16 discrete OUT (8 high-speed) • No analog IN • No analog OUT • No Ethernet port • BX36E • 20 discrete IN (10 high-speed) • 16 discrete OUT (8 high-speed) • 4 analog IN • 2 analog OUT • Ethernet port

  5. Interrupts (Why?) • Inputs are normally read at top of scan • Outputs are normally written to at bottom of scan • If input changes during scan, it is not seen by logic until the next scan • Most of the time this is OK because scan times are so fast for industrial world • Interrupts allow an input to be seen during scan • Interrupts allow an output to be changed during scan • 3 types of triggers for generating interrupts: • Events (up to 4) • Timers (up to 4) • Match registers (up to 4) • Each interrupt calls an ISR • Only on-board inputs can be used • Doesn’t have to be high-speed inputs Read Inputs Code Blocks Write Outputs

  6. Interrupts (Input Events) • Uses onboard input(s) to trigger interrupt • Expansion I/O cannot be used • Input Event: • Prequalifiers • Levels • High • Low • None or up to 19 • Levels are AND’d (i.e. all have to be true) • Event • Edges • Rising • Falling • Either • 1 or up to 20 • Edges are OR’d (i.e. any one will trigger interrupt) • Name of ISR that is called • LEVELS (all must be true): • If X13is LOW • AND X14is HIGH • AND X15is HIGH • AND X19is HIGH • …THEN… Read as: MyISR gets invoked if X13 is low (!X13) and X14 is high AND X15 is high and X19 is high and then either a rising edge is seen on X0(pX0), or a falling edge on X1 (nX1) or either edge on X2 (nX2 | pX2) • If all LEVELS are true then… • EDGES (any is true) • If there’s a rising edge on X0 • OR there’s a falling edge on X1 • OR there’s any edge on X2 • … THEN… • Call MyISR

  7. Interrupts (Timer) • Uses hardware 1µsec timer • Timer Mode • Recurrent • One Shot • Timer Duration • 1 to 2,147,483,647 µsec (35 min, 47.483647 sec) • Name of ISR that is called

  8. Interrupts (Timer Example) • Test example to compare between 4 ways of doing a 1-second timer that toggles an output • Each method will utilize Tickus() function in MATH to calculate the ON time of the toggle • TMR Instruction to toggle Y0 • D1 = current measured time in µsec • D2 = current difference from 1 second • D3 = maximum difference from 1 second • ENTASK instruction to toggle Y1 • D5 = current measured time in µsec • D6 = current difference from 1 second • D7 = maximum difference from 1 second • t$1Second to toggle Y2 • D9 = current measured time in µsec • D10 = current difference from 1 second • D11 = maximum difference from 1 second • Interrupt Timer to toggle Y3 • D13 = current measured time in µsec • D14 = current difference from 1 second • D15 = maximum difference from 1 second

  9. Interrupts (Timer Example) • 1-sec TMR Instruction = $Main T0 resets itself Calculate the difference from 1 second (1,000,000 µsec), store in D2 PONOFF toggles Y0 every 1 second When Y0 comes ON store TICKus() in D0 When Y0 goes OFF store difference between TICKus() in D0 into D1 Store the maximum difference into D3

  10. Interrupts (Timer Example) • ENTASK (enables Toggle_Y1)

  11. Interrupts (Timer Example) • Toggle_Y1 Task

  12. Interrupts (Timer Example) • $t1Second

  13. Interrupts (Timer Example) • Configuration Recurrent Timer with a duration of 1 second (1,000,000 µsec) that executes Toggle_Y3 ISR

  14. Interrupts (Timer Example) • ISR Toggle_Y3

  15. Interrupts (Timer Example) • Typical Accuracy TMR varies by 583µsec User Task varies by 579µsec $t1Second varies by 578µsec Timed Interrupt varies only 2µsec!

  16. Interrupts (Timer Example) D14 gray line’s standard deviation is negligible

  17. Interrupts (Match Registers) • Monitors high-speed I/O register values • Ctr/Tmr Accumulator (1, 2, 3) • Pulse Output Position (1, 2, 3) • Comparison • =, !=, >, >=, <, <= • …to an integer value (signed double-word) • Name of ISR that is called

  18. Interrupts (Match Registers Example) • Will compare the ability of ladder logic comparative contact VS Match Register interrupt, to see a specific (=; equal to) value in a high-speed position count • Axis1 = virtual axis • D0 = random new position (0 to 1,500,000) • 1,000,000 = position in which to toggle output • Y6 = output for Match Register Interrupt to toggle • Y7 = output for ladder logic comparative contact to toggle

  19. Interrupts (Match Registers Example) • Configuration

  20. Interrupts (Match Registers Example) • $Main Ladder comparative Configures Axis1 as a virtual axis Calculate a random new position Move to the new position which might cross position 1,000,000

  21. Interrupts (Match Registers Example) • ISR = MyMatch Toggles Y6 immediately

  22. Interrupts (Match Registers Example) Position 1,000,000 in Green • Typical Results • Ladder logic Y7 never toggles Match Register Interrupt always happens when current position exactly equals 1,000,000 Ladder logic compare never happens

  23. Interrupts (Instructions) • INTSUSPEND“Suspend Interrupts” • Edge triggered – suspend interrupts when input leg goes from OFF to ON • Power flow enabled – suspend interrupts while the input leg is ON • INTRESUME “Resume Interrupts” • Clear any Pending interrupts • If multiple interrupts occur duringsuspension, they “want” to run after resumption & will run in priority order; thisselection makes sure they don’t run at all • Edge triggered • Power flow enabled Code Blocks No Interrupts

  24. Interrupts (Instructions) • INTCONFIG“Configure Interrupt” • Allows interrupts to be configured just like the System Configuration dialog • 3 tabs for configuring (Input Event, Timer, Match Register) • Edge triggered or Power flow enabled • Can use <Load from SystemConfig> button to pull data in from what is already configured there • Can use variables in the instruction whereas variables cannot be used in the System Configuration

  25. Interrupts (INTCONFIG Example) • Will generate a pulse with a 3-second period but with a variable duty cycle: • D0 = Duty Cycle in percent • D1 = ON time of pulse • D2 = OFF time of pulse

  26. Interrupts (INTCONFIG Example) • Configuration & the ISR (MyPulse) • D0 = DutyCycle (in percent) Based on Duty Cycle (D0) ON & OFF times are calculated When Y6 is OFF reconfigure Timer interrupt for ON time When Y6 is ON reconfigure Timer interrupt for OFF time Timer Interrupt configuration just kicks things off 2 seconds (2,000,000 µsec) after Program-to-Run transition Toggle Y6 immediately

  27. Interrupts (INTCONFIG Example) • Results • D0 = DutyCycle 10% Duty Cycle (D0) 3-second period ON time = 0.3 sec OFF time = 2.7 sec

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