Siemens SPS starter kit 6ED1057-3BA00-0AA8 12 Vdc, 24 Vdc 6ED1057-3BA00-0AA8 Hoja De Datos
Los códigos de productos
6ED1057-3BA00-0AA8
LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 06/2014, A5E33039675
Manual, 06/2014, A5E33039675
225
● Max/Min (Page 234) (actual value AQ)
● On-delay (Page 136) (current time Ta)
● Off-delay (Page 140) (current time Ta)
● On-/off-delay (Page 142) (current time Ta)
● Retentive on-delay (Page 144) (current time Ta)
● Wiping relay (pulse output) (Page 146) (current time Ta)
● Edge-triggered wiping relay (Page 148) (current time Ta)
● Asynchronous pulse generator (Page 150) (current time Ta)
● Stairway lighting switch (Page 154) (current time Ta)
● Multiple function switch (Page 156) (current time Ta)
● Stopwatch (Page 171) (actual value AQ)
● Threshold trigger (Page 180) (actual value Fre)
Select the required function by the block number. The timebase is configurable. For
● On-delay (Page 136) (current time Ta)
● Off-delay (Page 140) (current time Ta)
● On-/off-delay (Page 142) (current time Ta)
● Retentive on-delay (Page 144) (current time Ta)
● Wiping relay (pulse output) (Page 146) (current time Ta)
● Edge-triggered wiping relay (Page 148) (current time Ta)
● Asynchronous pulse generator (Page 150) (current time Ta)
● Stairway lighting switch (Page 154) (current time Ta)
● Multiple function switch (Page 156) (current time Ta)
● Stopwatch (Page 171) (actual value AQ)
● Threshold trigger (Page 180) (actual value Fre)
Select the required function by the block number. The timebase is configurable. For
information on valid ranges and parameter defaults, refer to the On-delay (Page 136) topic.
Parameters p (number of decimals)
Parameter p applies only to the display of the Ax value in a message text.
Functional description
The function reads the value of the signal at the analog input Ax.
This value is multiplied by the value of parameter A (gain). Parameter B (offset) is added to
the product, as follows:
(Ax • Gain) + Offset = Actual value Ax
The function block calculates the proportion of the actual value Ax to the range. The block
(Ax • Gain) + Offset = Actual value Ax
The function block calculates the proportion of the actual value Ax to the range. The block
sets the digital output Q high for the same proportion of the T (periodic time) parameter, and
sets Q low for the remainder of the time period.
Examples with timing diagrams
The following examples show how the PWM instruction modulates a digital output signal
from the analog input value:
Example 1
Analog input value: 500 (range 0 to 1,000)
Periodic time T: four seconds
The digital output of the PWM function is 2 seconds high, 2 seconds low, 2 seconds high, 2
Example 1
Analog input value: 500 (range 0 to 1,000)
Periodic time T: four seconds
The digital output of the PWM function is 2 seconds high, 2 seconds low, 2 seconds high, 2
seconds low and continues in that pattern as long as parameter "En" = high.