Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 230)

100

101

Preface

MicroLogix 1000 Programmable Controllers User Manual

12–16

When

a high preset is reached, the:

•

HP bit is set.

• High-speed counter interrupt file (program file 4) is executed if the interrupt is

enabled. The IH bit is set and the IL, IN, and IV bits are reset.

Unlike the Up Counters, the accumulator value does not reset and the high preset

value does not get loaded from the image to the hardware high preset register.

The Following Condition Occurs when

either the hardware accumulator transitions from the hardware low

preset +1 to the hardware low preset, or

A low preset is reached

the hardware accumulator is loaded with a value less than or equal

to the hardware low preset, or

the hardware low preset is loaded with a value that is greater than

or equal to the hardware accumulator.

When

a low preset is reached, the:

• LP bit is set.

• High-speed counter interrupt file (program file 4) is executed if the interrupt is

enabled. The IL bit is set and the IH, IN, and IV bits are reset.

An overflow occurs when the hardware accumulator transitions from +32,767 to

–32,768. When an overflow occurs, the:

•

OV bit is set.

• High-speed counter interrupt file (program file 4) is executed if the interrupt is

enabled. The IV bit is set and the IH, IL, and IN bits are reset.

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