Author Question: Which one of the following statements on PLC sequencers is NOT true? A) PLC sequencers change the ... (Read 75 times)

madam-professor · **on:** Jul 28, 2018

Which one of the following statements on PLC sequencers is NOT true?

A) PLC sequencers change the output sequence bit pattern based on a comparison of an input word with stored bit patterns in sequencer registers.
B) Sequencer instructions can be used individually or in pairs.
C) Sequencer instructions require special sequencer modules.
D) The basic PLC sequencer function provides the capability to program many steps and provide multiple outputs.

Question 2

Which one of the following statements about troubleshooting ladder logic counter programs is NOT true?

A) Test counters starting with last in the sequence, and then add one counter at a time. Use the temporary end instruction, TND.
B) If reset is present, verify that all counter driven functions are complete or reached the correct ACC value before the reset.
C) Use the suspend instruction, SUS, to verify status values for all registers and bits at critical points in the ladder.
D) Most difficult counter programs to verify have multiple cascaded counters and reset instructions.