Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 60)

Advanced Instruction Set

Chapter 6

63

NOTE: When your processor is in the test mode, all outputs are not active.

When your processor is in the run mode, all outputs are active.

Scan

ime

Scan time is the amount of time it takes the processor to monitor and update

inputs and outputs, and to execute instructions in memory in accordance with

your program. The scan is performed serially; first the I/o image table is

updated, (other parts of the data table are not scanned), then the user program

area is scanned.

There are two ways to measure I/o scan time:

Program the rungs in Figure 6.2. The operations section of this manual

provides general instruction on how to program rungs.

Add the execution values for each instruction by using Table 6.A. The sum

of these values is the I/O scan time.

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 214 215

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 60