Delta v Course 7009-9

 TM

Phase Logic Modules (PLMs) 9-1 

9-2 

Objectives Upon completion of this module you will be able to define 

The application of a Phase Logic Module

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States of a PLM 

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 Named Set for FAIL_MONITOR

9-3 

Phase Logic Module

9-4 

Phase Logic Module The Phase Logic Module is a module that defines the states of the phase and logic associated with each state.

9-5 

Failure_Monitor 

9-6 

Failure_Monitor  The Failure_Monitor  continuously monitors failure conditions and sets the FAIL_INDEX  equal to the fail number. When FAIL_INDEX is a non-zero, the  phase transitions to the Holding state.

9-7 

Failure_Monitor Defaults

9-8 

FAIL_INDEX

9-9 

Workshop - PLM Plant Shutdown Step 1.

Modify Name Set phase_failures. Add the name for the phase failure:  Block valve 101 is open.

9-10 

Workshop - PLM Plant Shutdown Step 2.

From DeltaV Explorer create PLM-SHUTDOWN. Change the Object type to Phase Logic Module.

9-11 

Workshop - PLM Plant Shutdown Step 3.

Open PLM-Shutdown with Control Studio. Create a PLM parameter  SHUTDOWN-LEVEL (floating point).

9-12 

Workshop - PLM Plant Shutdown Step 4.

Add a Condition Block to FAIL_MONITOR to determine whether  Tank101’s block valve is OPEN (XVSTAT-101). Set the Condition Block parameter  Disable to 1.

Step 5.

Modify the expression of  BLOCK1 to include an IF THEN statement to check OUT_D of the Condition Block and set FAIL_INDEX if the  block valve is OPEN.

9-13 

Workshop - PLM Plant Shutdown RUN_LOGIC SHUTDN TANK101

Perform actions necessary to shutdown Tank101 utilizing confirms Wait for above devices to transition utilizing the PENDING_CONFIRMS  parameter 

SET T201 LEVEL

Enable monitoring of phase condition (set Disable parameter to 0). Set LIC-20X SP to SHUTDOWN-LEVEL

Wait for level to be satisfied.

STOP MTR-203

Stop MTR-203

Wait for motor to stop.

CLOSE FIC-20X

Close FIC-20X. Disable monitoring of phase condition (set Disable parameter to 0).

Wait for flow valve to close.

Step 6.

Define RUN_LOGIC.

 Note: Assumption for RUN_LOGIC to work, process is running with the Cascade Pair in the normal mode. 9-14

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Workshop - PLM Plant Shutdown HOLD_LOGIC HOLD STATE

Failure detected  (‘/FAIL_INDEX.CV’!=0)

Close Tank101 block valve

Disable monitoring of phase condition

True

FAIL SAFE

Step active for at least 2 sec (Step parameter - TIME )

STOP DRAIN

Stop MTR-203 and confirm Close FIC-20X and confirm Wait for above devices to transition utilizing the PEND_CONFIRMS parameter 

Step 7.

Define HOLD_LOGIC. 9-15

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Workshop - PLM Plant Shutdown RESTART_LOGIC RESTART DRAIN

Set FIC-20X mode to CAS Start MTR-203 Enable monitoring of phase condition Wait for motor to start

Step 8.

Define RESTART_LOGIC.

Step 9.

Assign PLM to your controller.

Step 10. Save and download the PLM . Step 11. If an algorithm error occurs, use the Check  the PLM.

 button to check 

Step 12. Add the PLM_ dynamo from frsModules dynamo set to an operator  display. Step 13. Optional: Define logic for Stop and  Abort. 9-16 

Workshop - PLM Plant Shutdown

Step 14. Toggle Phase Owner to External  by clicking on the toggle button.

9-17 

Workshop - PLM Plant Shutdown

Step 15. Click on the Phase Command  ellipse button to display a list of  valid phase commands. Issue the Start command. 9-18 

Workshop - PLM Plant Shutdown

Step 16. While the PLM is running, Open XV-101 to cause a failure. Verify PLM runs HOLD logic. Step 17. Verify Failure State utilizing the Detail Faceplate. 9-19 

Workshop - PLM Plant Shutdown

Step 18. Clear Failures.

Step 19. Issue the Restart command. 9-20

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Workshop - PLM Plant Shutdown

Step 20. Issue a Hold command  while PLM is running. Step 21. Restart PLM after Hold  logic is complete.

9-21 

Workshop - PLM Plant Shutdown

Step 22. Reset PLM when it is complete. Also verify that PLM transitions to Idle. 9-22 