Lead/Lag - ABB ACSM1 Firmware Manual

Inputs
Outputs

LEAD/LAG

(10071)
Illustration
Execution time
Operation
Inputs
Outputs
Input (X): REAL
-3 dB cutoff frequency input (FRQ): DINT (0...16383 Hz)
Reset input (RESET): Boolean
Output (Y): REAL
LEAD/LAG
TLA1 1 msec
X
ALPHA
Tc
RESET
5.55 µs
The output (Y) is the filtered value of the input (X). When ALPHA > 1, the function block
acts as a lead filter. When ALPHA < 1, the function block acts as a lag filter. When
ALPHA = 1, no filtering occurs.
The transfer function for a lead/lag filter is:
T T
(1 + ALPHA s) / (1 +
c c
When RESET input is 1, the input value (X) is connected to the output (Y).
If ALPHA or Tc < 0, the negative input value is set to zero before filtering.
Input (X): REAL
Lead/Lag filter type input (ALPHA): REAL
Time constant input (Tc): REAL
Reset input (RESET): Boolean
Output (Y): REAL
69
(1)
Y
s)
Y(69)
Standard function blocks
351