Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Instrukcja Użytkownika Pobierz pdf (Strona 221)

Using High-Speed Counter Instructions

12–7

The

table below lists the function key you press to choose the type of high-speed

counter you want.

-Speed

Coun

ype

H g -Speed Coun er Func onal y

Input Terminal Used

-Speed

Coun

ype

and Function Key

-Speed

Coun

Func

onal

I/0 I/1 I/2 I/3

[F1] Up

Up Counter operation uses a single-ended

input.

Up↑ Not Used Not Used Not Used

[F2] Up

(with reset and hold)

Up Counter operation uses a single input

with external reset and hold inputs.

Up↑ Not Used Reset↑ Hold

[F3] Pulse and direction

Bidirectional operation uses both pulse

and direction inputs.

Count↑ Direction Not Used Not Used

[F4] Pulse and direction

(with external reset and hold)

Bidirectional operation uses both pulse

and direction inputs with external reset and

hold inputs.

Count↑ Direction Reset↑ Hold

[F5] Up and down

Bidirectional operation uses both up and

down direction inputs.

Up↑ Down↑ Not Used Not Used

[F6] Up and down

(with external reset and hold)

Bidirectional operation uses both up and

down pulse inputs with external reset and

hold inputs.

Up↑ Down↑ Reset↑ Hold

[F7] Encoder

Bidirectional operation uses quadrature

encoder inputs.

A B Not Used Not Used

[F8] Encoder

(with external reset and hold)

Bidirectional operation uses both

quadrature encoder inputs with external

reset and hold inputs.

A B Z Hold

One difference between Up Counters and Bidirectional Counters is that for

Bidirectional Counters the accumulator and preset values are not changed by the

high-speed counter when the presets are reached. The RAC and HSL instructions

must be used for this function. The Up Counters clear the accumulator and re-load

the high preset values whenever the preset is reached.

Programming

1 2 ... 216 217 218 219 220 221 222 223 224 225 226 ... 421 422

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