Question

3) Answer the questions, in sequence, for the jump to subroutine and return program in Figure 3. Assume all swtiches are turned off after each operation. a) Switches S1, S3, S4, and S5 are all turned on. Which pilot light will not be turned on? Why? b) Switch S2 is turned on and then switch S4 is turned on. Will output PL3 be energized? Why? c) To what rung does the RET instruction return the program scan? L1 Inputs Outputs L2 S1 PL1 PL1 S2 JSR JUMP-TO-SUBROUTINE SBR file number U:3 PL2 PL2 S3 S4 PL3 PL4 S5 PL4 Subroutine file 3 S4 PL3 SBR SUBROUTINE RET RETURN Figure 3 – PLC Program for Question 3

          3) Answer the questions, in sequence, for the jump to subroutine and return program in Figure 3. Assume all swtiches are turned off after each operation. a) Switches S1, S3, S4, and S5 are all turned on. Which pilot light will not be turned on? Why? b) Switch S2 is turned on and then switch S4 is turned on. Will output PL3 be energized? Why? c) To what rung does the RET instruction return the program scan? L1 Inputs Outputs L2 S1 PL1 PL1 S2 JSR JUMP-TO-SUBROUTINE SBR file number U:3 PL2 PL2 S3 S4 PL3 PL4 S5 PL4 Subroutine file 3 S4 PL3 SBR SUBROUTINE RET RETURN Figure 3 – PLC Program for Question 3

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3) Answer the questions, in sequence, for the jump to subroutine and return program in Figure 3. Assume all swtiches are turned off after each operation. a) Switches S1, S3, S4, and S5 are all turned on. Which pilot light will not be turned on? Why? b) Switch S2 is turned on and then switch S4 is turned on. Will output PL3 be energized? Why? c) To what rung does the RET instruction return the program scan? L1 Inputs Outputs L2 S1 PL1 PL1 S2 JSR JUMP-TO-SUBROUTINE SBR file number U:3 PL2 PL2 S3 S4 PL3 PL4 S5 PL4 Subroutine file 3 S4 PL3 SBR SUBROUTINE RET RETURN Figure 3 – PLC Program for Question 3

Added by Gregg T.

Computer Science and Information Technology

Trishna Knowledge Systems 2018 Edition

Chapter 6

Instant Answer

Solved by Expert Adi S

06/21/2023

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When switches S1, S3, S4, and S5 are all turned on, the pilot light that will not be turned on is PL3. This is because the JSR (Jump to Subroutine) instruction is activated by S1, which jumps the program scan to the subroutine file 3. However, the subroutine does Show more…

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Answer the questions, in sequence, for the jump to subroutine and return program in Figure 3. Assume all switches are turned off after each operation. Switches S1, S3, S4, and S5 are all turned on. Which pilot light will not be turned on? Why? Switch S2 is turned on and then switch S4 is turned on. Will output PL3 be energized? Why? To what rung does the RET instruction return the program scan?

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