Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 223)

100

101

Using High-Speed Counter Instructions

12–9

When

a high preset is reached, no counts are lost.

• Hardware and instruction accumulators are reset.

• Instruction high preset is loaded to the hardware high preset.

• If the DN bit is not set, the DN bit is set. The IH bit is also set and the IL, IV,

and IN bits are reset.

• If the DN bit is already set, the OV bit is set. The IV bit is also set and the IL,

IV and IN bits are reset.

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

enabled.

The following tables summarize what the input state must be for the corresponding

high-speed counter action to occur:

Up Counter

Input State

H g -Speed

Input Count

(I/O)

Input

Direction

(I/1)

Input Reset

(I/2)

Input Hold

(I/3)

HSC Rung

High-Speed

Counter Action

Turning

Off-to-On

NA NA NA True Count Up

NA NA NA NA False Hold Count

Off, On, or

Turning Off

Off, On, or

Turning Off

NA NA Hold Count

NA (Not Applicable)

Programming

1 2 ... 218 219 220 221 222 223 224 225 226 227 228 ... 421 422

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