Deck 14: Control Logix Counter Instructions

Question 1

When using RSView ME software, the development software for the PanelView Plus operator interface, what is meant by direct tags?

Answer 1

Screen objects in the RSView ME software can be directly associated via Ethernet and RSLinx Enterprise software directly with tags in the RSLogix 5000 tag collection. This direct association is referred to as direct tags.

Question 2

What happens to the accumulated value of the counter if the controller loses power?

Answer 2

Counters are retentive instructions. If the controller loses power for any reason and the controller battery or energy storage module is in good condition, the counter will remember, or retain, its accumulated value when power is restored.

Question 3

One important consideration when working with counters is the speed or frequency with which an input device is sending the false-to-true signals to the controller.

Answer 3

True

Question 4

When using the CTD counter, the reset instruction is typically used to put a 0 into the accumulated value when resetting the counter.

Question 5

Because counters are retentive, a reset (RES) instruction is used with count up counters to reset the accumulated value back to ____________________.

Question 6

Count up counters have three status bits: enable, done, and underflow.

Question 7

It is possible for a counter to continue to count past the preset value.

Question 8

Briefly describe the three-DINT structure of a ControlLogix counter.

Question 9

List the seven components of an RSLogix counter instruction.

Question 10

The count up counter increments each time the ____________________ changes from false to true

Question 11

The count up counter counts from 0 up to a predetermined value, called the accumulated value.

Question 12

When the accumulated value and the preset value are equal in the count up instruction, the ____________________ status bit is set.

Question 13

To keep an accumulated tally of the number of times some predetermined event transpires, the appropriate instruction is the ____________________ instruction.

Question 14

Briefly describe how overflowing or underflowing is avoided in counters.

Question 15

The key to having a separate count up instruction and a separate count down instruction working together to create a counter that counts in both directions is that both counters share the same ____________________.