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Siemens 6ED1050-1AA00-0BE8 User Manual

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LOGO! functions 
 
4.4 Special functions list - SF 
 
LOGO! 
210
 
Manual, 04/2011, A5E03556174-01 
4.4.17 
Threshold trigger 
Short description 
The output is set and reset with two configurable threshold triggers.      
 
Symbol in LOGO! 
Wiring 
Description 
Input Fre 
The function counts the 0 to 1 transitions at input Fre. 
1 to 0 transitions are not counted. 
Use  
• 
inputs I3, I4, I5, I6 for fast counting (only LOGO! 
12/24RC/RCo, LOGO! 12/24RCE, LOGO! 24/24o 
and LOGO! 24C/24Co): max. 5 kHz, if the fast 
input is directly connected to the threshold trigger 
function block 
• 
any other input or circuit component for counting 
low frequency signals (typ. 4 Hz). 
Parameter 
On: On threshold 
Range of values: 
0000...9999 
Off: Off threshold 
Range of values: 
0000...9999 
G_T: Time interval or gate time during which the input 
pulses are measured. 
Range of values: 
00:00 s...99:99 s 
4
)UH
3DU
 
Output Q 
Q is set and reset at the thresholds. 
Parameter G_T 
The gate time G_T can be provided by the actual value of another already-programmed 
function. You can use the actual values 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)