Siemens 6ED1050-1AA00-0BE8 Benutzerhandbuch

 

LOGO! functions 

 

4.4 Special functions list - SF 

LOGO! 
Manual, 04/2011, A5E03556174-01 

261

 

4.4.31 

Pulse 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 

the PWM function block. 

Input Ax 

Analog signal to be modulated to a pulsed digital 

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 

aᇄ

4

(Q
$[
3DU

 

 

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)