Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 61)

Advanced Instruction Set

Chapter 6

64

Figure 6.2

Rungs

for Measuring Scan T

ime

031

CTU

031

PR 999

031

AC 000

Rung 1

CTU

031

PR 999

AC 000

Rung 2

031

RTO

032

0.1

PR 999

Rung 3

AC 000

010

032

Store

Rung 4

Store

031

CTR

031

PR 100

Rung 5

AC 000

031

RTR

032

Rung 6

0.1

PR 999

AC 000

Here is an explanation of each rung:

Rung 1: The count increments its accumulated value each time this rung is true.

Rung 2: This rung enables the counter to increment on the next scan. If we did

not have this rung, the counter would always be true and it would not

increment. Remember: Counters increment only on false to true transitions.

Rung 3: The timer times in tenths of seconds when we are counting. This value

is displayed on the industrial terminal screen.

Rung 4: The actual scan time is displayed beneath store 2 and store 3 in

milliseconds.

Rung 5: An input device is controlling the counter.

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 214 215

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 61

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