Question

12. Which statement best describes the operation of an MCR zone? a. When the start rung is true the processor skips over the rungs in the zone b. When the start rung is true all outputs in the zone go false c. When the start rung is false the rungs in the zone behave normally d. When the start rung is false all of the rungs in the zone go false 13. Which statement best describes JMP to LBL? a. When the JMP rung is true the processor skips over the rungs in the zone b. When the JMP rung is true all outputs in the zone go false c. When the JMP rung is false the rungs in the zone aren't updated d. When the JMP rung is false all of the rungs in the zone go false 14. The Main Routine in a ControlLogix processor calls 2 subroutines. Remembering that a PLC scans ladder the way you read a book, show the scan cycle and label the circle shown. Add lines as required. Include MR (Main Routine), CALC and TEST in the scan cycle drawing. TEST SR Jump To Subroutine Routine Name CALC USR- Jump To Subroutine Routine Name TEST MR CALL 15. Local:3:0.Data.5 must always be on. An input device has failed. Add a program control instruction to the rung below to make sure Local:3:0.Data.5 stays on. Local 21 Data 4 Local 2:1 Data 7 TIMERA.DN E NOP Local 3:0 Data 5 16. A sensor has failed and the pump is filling a tank that is overflowing (vegetable oil is splashing all over the production floor). You send the apprentice to grab a replacement sensor from central stores. While you wait, you add a program control instruction to turn off the pump. Pencil in the correct program control instruction. LEVEL SENSOR <Local 21 Data 23> PUMP888 <Local 3:0 Data 20>

12. Which statement best describes the operation of an MCR zone?
a. When the start rung is true the processor skips over the rungs in the zone
b. When the start rung is true all outputs in the zone go false
c. When the start rung is false the rungs in the zone behave normally
d. When the start rung is false all of the rungs in the zone go false
13. Which statement best describes JMP to LBL?
a. When the JMP rung is true the processor skips over the rungs in the zone
b. When the JMP rung is true all outputs in the zone go false
c. When the JMP rung is false the rungs in the zone aren't updated
d. When the JMP rung is false all of the rungs in the zone go false
14. The Main Routine in a ControlLogix processor calls 2 subroutines. Remembering that a PLC scans
ladder the way you read a book, show the scan cycle and label the circle shown. Add lines as
required. Include MR (Main Routine), CALC and TEST in the scan cycle drawing.
TEST
SR
Jump To Subroutine
Routine Name CALC
USR-
Jump To Subroutine
Routine Name TEST
MR
CALL
15. Local:3:0.Data.5 must always be on. An input device has failed. Add a program control instruction
to the rung below to make sure Local:3:0.Data.5 stays on.
Local 21 Data 4 Local 2:1 Data 7 TIMERA.DN
E
NOP
Local 3:0 Data 5
16. A sensor has failed and the pump is filling a tank that is overflowing (vegetable oil is splashing all
over the production floor). You send the apprentice to grab a replacement sensor from central
stores. While you wait, you add a program control instruction to turn off the pump. Pencil in the
correct program control instruction.
LEVEL SENSOR
<Local 21 Data 23>
PUMP888
<Local 3:0 Data 20>

Added by Carolina L.

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