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.
A
You might also like to view...
Insulation must protect from flashover damage and _____.
a. moisture damage b. impulse damage c. bearing damage d. tracking damage
What should be drained, cleaned, and flushed on a regular basis?
A) The sump and all water lines B) The evaporative condenser C) The cooling tower basin D) The compressor and blower
Which of these procedures used to convert coal-to-liquid fuel creates a synthetic crude, called syncrude, which is then refined to produce gasoline or diesel fuel?
A) Cracking B) Distillation C) Direct method D) Indirect method
The diac is generally symmetrical to within about ____ volt(s).
a. .3 b. .5 c. .7 d. 1