Unication Messenger m90 Manual de usuario descargar pdf (Pagina 49)

Hardware Configuration

If you select the high-speed counter function that does not include Reset, note that you

must reset it within your Ladder program. This type of counter only counts up.

If you select the high-speed counter function with reset, the counter is capable of counting

up within the positive range, 0-32767. This function uses the next-to-last input as a counter

reset. Since the reset is done via the hardware, the reset is immediate and independent of

the program scan.

Frequency Measurement

This counts the number of pulses over the selected period of time (sample rate): 100 msec,

500 msec, or 1000 msec (1 second), expressing the result in Hertz. For example, 155

pulses counted over 100 msec is equal to 1550Hz; 155 pulses counted over 500 msec is

equal to 310Hz.

Compare Functions and Counter Values

It is probable that a counter value will not be read at the exact moment that a Compare

function in your program is being carried out. This can cause an Equal (=) function to miss

the desired counter value; if the counter does not reach the value required by the Equal

function at the moment the function is carried out, the Equal function cannot register that

the value has been reached. To avoid this problem, use functions Greater Than Or Equal

To (≥) and Lesser Than Or Equal To (≤).

High-Speed Output: PWM

M90

M90 OS versions 2.00 (B01) and later enable you to use the last on-board output of M90

models T1 and T1-CAN in either:

High Speed Output (HSO) mode

Normal output mode.

Using HSO mode gives you the ability to use an output as a PWM (Pulse Width

Modulation) output. You can also use an output in HSO mode together with stepper motor

controllers.

To use HSO mode:

1. Use System Integer SI 16 HSO Mode to change the operating mode of Output 11

from Normal mode to HSO mode: 0=Normal Mode, 1: HSO Mode.

This should be part of your program’s Power-up tasks.

2. Set the output frequency (F) by storing a value into SI 17 HSO Frequency.

Note that F=1/T, where T is the duration time of a complete cycle.

You can store a value of 0, or a value from 3-1500Hz; other frequency values are not

supported.

3. Set the duty cycle—the ratio of the "on" period of a cycle to the total cycle period—by

storing a value into SI 18 Duty Cycle. This value may be from 0-1000, and is

expressed as a percentage.

If, for example, the constant 750 is stored into SI 18, the duty cycle is equal to 75.0%.

This means that the pulse will hold a positive state during 75.0% of the total cycle.

4. Use SB 16 HSO RUN to control the output; when SB 16 is ON, Output 11 operates.

In the figure below, SI 18 is equal to 250. This results in the duty cycle being 25% of the

total cycle time.

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 406 407

Comentarios a estos manuales

Sin comentarios

Unication Messenger m90 Manual de usuario Pagina 49

Comentarios a estos manuales