Rockwell-automation 1746-HSCE2 Multi-Channel High Speed Counter Module Uživatelský manuál stáhnout pdf (Strana 23)

Publication 1746-UM002B-EN-P - August 2004

Module Operation 2-3

Pulse/Internal Direction

When the Pulse/Internal Direction configuration is selected, a bit

written from the backplane determines the direction of the counter.

The counter increments on the rising edge of the input if the bit is low

(0) and decrements on the rising edge of the input if the bit is high

(1).

Up and Down Pulses

In this configuration, the counter increments on the rising edge of

pulses applied to input A and decrements on the rising edge of pulses

applied to input B.

Figure 2.3 Up and Down Pulse Configuration

TIP

When both inputs transition simultaneously or near

simultaneously, the net result is no change to the

count value. Therefore, simultaneous (or near

simultaneous) pulses are ignored and no change in

the count value is reported.

12321012

Input A

Input B

Input Z

Incrementing Encoder

or Sensor

Increment Pulse

(count up)

Increment Pulse

(Input A)

Decrementing Encoder or

Sensor

Decrement Pulse

(count down)

Decrement Pulse

(Input B)

Count

Module

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 139 140

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Rockwell-automation 1746-HSCE2 Multi-Channel High Speed Counter Module Uživatelský manuál Strana 23