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4.4 Special functions list - SF

4.4.31Pulse Width Modulator (PWM)

Short description

The Pulse Width Modulator (PWM) instruction modulates the analog input value Ax to a pulsed digital output signal. The pulse width is proportional to the analog value Ax.

Symbol in LOGO!

Wiring

Description

 

 

 

 

 

 

 

 

 

 

 

Input En

A positive edge (0 to 1 transition) at input En enables

(Q

 

 

aᇄ

 

 

 

the PWM function block.

 

 

 

 

 

$[

 

 

 

 

 

 

 

 

 

4

Input Ax

Analog signal to be modulated to a pulsed digital

 

 

 

 

 

 

 

 

 

3DU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

output signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parameter

A: Gain

 

 

 

 

 

 

 

 

 

 

 

 

Range of values: ± 10.00

 

 

 

 

 

 

 

 

 

 

 

 

B: Zero offset

 

 

 

 

 

 

 

 

 

 

 

 

Range of values: ± 10,000

 

 

 

 

 

 

 

 

 

 

 

 

T: Periodic time over which the digital output

 

 

 

 

 

 

 

 

 

 

 

 

is modulated

 

 

 

 

 

 

 

 

 

 

 

 

p: Number of decimals

 

 

 

 

 

 

 

 

 

 

 

 

Range of values: 0, 1, 2, 3

 

 

 

 

 

 

 

 

 

 

 

 

Min:

 

 

 

 

 

 

 

 

 

 

 

 

Range of values: ±20,000

 

 

 

 

 

 

 

 

 

 

 

 

Max:

 

 

 

 

 

 

 

 

 

 

 

 

Range of values: ±20,000

 

 

 

 

 

 

 

 

 

 

 

Output Q

Q is set or reset for the proportion of each time period

 

 

 

 

 

 

 

 

 

 

 

 

according to the proportion of the standardized value

 

 

 

 

 

 

 

 

 

 

 

 

Ax to the analog value range.

Parameter T

Note the defaults of the T parameters listed in topic Time response (Page 151).

The periodic time T can be provided by the actual value of another already-programmed function. You can use the actual value of the following functions:

●Analog comparator (Page 218) (actual value Ax – Ay)

●Analog threshold trigger (Page 213) (actual value Ax)

●Analog amplifier (Page 226) (actual value Ax)

●Analog multiplexer (Page 248) (actual value AQ)

●Analog Ramp (Page 251) (actual value AQ)

●Mathematic instruction (Page 265) (actual value AQ)

●PI controller (Page 256) (actual value AQ)

●Up/down counter (Page 201) (actual value Cnt)

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Manual, 04/2011, A5E03556174-01

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Siemens 6ED1050-1AA00-0BE8 manual Pulse Width Modulator PWM, Short description
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