User Manual

Wiring with easy800
192
08/04 AWB2528-1423GB
Function of the signal smoothing filter function block
If the function block is called for the first time, the output
value is initialised with the input value when the device is
started or after a reset. This speeds up the startup behaviour
of the function block.
The function block operates according to the following
equation:
Y(t) = [T
a
/T
g
] x [K
p
x x(t) – Y(t–1)]
Y(t) = Calculated output value for scan time t
T
a
= Scan time
T
g
= Recovery time
K
p
= Proportional gain
x(t) = Actual value with scan time t
Y(t–1) = Output value with scan time t – 1
Scan time:
Scan time T
a
depends on the set recovery time value.
GET, fetch a value from the network
The function block allows you to selectively read (get) a
32 bit value from the network. The GET function block
fetches data which another station has made available on
the easy-NET network with a PUT function block.
h
The signal smoothing filter must be enabled so that it can
work. Coil FT..EN is active. If coil FT..EN is not active, the
entire function block is deactivated and reset. The output
value is set to zero.
h
The function block updates the output value every time
recovery time T
g
expires.
Recovery time T
g
Scan time T
a
0.1 s to 1 s 10 ms
1 s to 6553 s T
g
x 0.01