Horner-apg QX651 OCS Manuel d'utilisateur télécharger pdf (Page 40)

CH. 8 MAN0798-04-EN

August 20, 2009 Page 40 of 95 ECN # 979

3. If satisfied with the controller now selected, click the High Speed Counter slot or the Config button next to it.

Note: In this example configuration, Ethernet is not

used, but it is available for use.

4. The Module Configuration screen appears with two tabs at the top: Press the HSC Setup tab.

8.6.2 Configuration Procedures

Figure 8-5 – Built-In HSC Configuration Screen

Two HSC counters are available that have the following

functions depending upon configuration:

Counter #1 – Totalizer (32-Bit) or Frequency Counter.

Counter #2 – Totalizer (16-Bit) only.

Both Counter #1 and Counter #2 can be configured for

use.

Configuring Counter #1:

1. Select Totalize or Frequency from the Type pull-down

box.

a. If Totalize is chosen:

Select how the counter counts by

choosing an option from the Mode pull-down box.

Internal (10 MHz Clock)

Count up (Inputs 1 and 2)

Count down (Inputs 1 and 2)

Up/down (Input 1 up, Input 2 down)

Clock/dir (Input 1 clock, dir from Input 2)

Clock/dir (Input 1 clock, dir from %Q)

Quadrature (Inputs 1 and 2)

b. If Frequency is chosen:

Select a time base option for

counting from the Frequency Period pull-down box.

Note: The Frequency counter measures the counts per

frequency period. If Frequency Period is set to one

second, the counts are in Hz.

2. Select the functions that apply to the counter.

Functions show the sources from where triggers come

from to disable, latch, preload, or clear the counter.

Note: Not all functions are available in both types of

counters as indicated by the following descriptions.

♦Disable Function -Triggers counter to stop.

♦Latch Function –Triggers snapshot of the accumulator

value upon an event.

♦Preload Function –(Not

used in Frequency Counter)

Triggers loading of a value upon

event.

♦Clear Function–(Not

used in Frequency Counter)

Triggers the accumulating register to be

zeroed out.

The functions each have a pull-down box with the following

options:

Disabled

External Input #1

External Input #2

External Input #3

Overflow Interrupt – Triggers when the accumulator value

goes beyond the maximum value

(rolls over).

Underflow Interrupt – Triggers when signal goes below

zero.

Assigned %Q

3..Select a Polarity option. A Polarity pull-down box is associated

with each function and indicates the manner in which the trigger

happens. The options for Latch, Preload, and Clear are:

High Level

Low Level

Falling Edge

Rising Edge

The options for Disable are High or Low Level.

4. Select input filtering options for the three high-speed inputs from

the Input Filtering pull-down box. Example: If 500 kHz is selected,

any frequency above 500 kHz is filtered.

5. I/O Mapping – Allows the user to set where the HSC data is

mapped. Default references are set automatically and are initially

shown on the screen until the user changes them. See Runtime I/O

Map at the end of this configuration procedure.

6. If satisfied with selections, press OK. Cscape configuration is

completed for this example.

Configuring Counter #2:

Configuring Counter #2 uses the same procedure for configuring

Counter #1 as a Totalizer counter. To configure Counter #2, start at

the beginning of the Configuration Procedures section.

Note: The only function available for Counter #2 is the Clear

Function.

High

Falling Edge

Rising Edge

Low

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Horner-apg QX651 OCS Manuel d'utilisateur Page 40

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