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5 Function blocks
5.14 FT, signal smoothing filter
194
Control Relay easy800 11/11 MN04902001Z-EN www.eaton.com
Memory
56 + per 4 Byte/Constant at function block input
Cycle time [μs]
easy800 standard
60
Response of the function block
The step response of the FT function is an e function. After a time t = T
normalized output value is 0.63 QV/QV
QV/QV
max
1.0
0.9
0.8
0.7
0.63
0.6
0.5
0.4
0.3
0.2
0.1
0
0
0.1
Figure 133:Figure: Step response of the FT function block
￫
The function block updates the output value every time recovery
time T
expires.
g
The function block operates according to the following equation:
Y(t) = [T
/T
] x [K
x (x(t) - Y(t-1))]
a
g
p
Y(t)
= Calculated output value for scan time t
T
= Scan time
a
T
= Recovery time
g
K
= Proportional gain
p
x(t)
= Output value with scan time t
Y(t–-1) = Output value with scan time t - 1
Scan time:
Scan time T
depends on the set recovery time value.
a
Recovery time T
g
0.1 s - 1 s
1 s - 6553 s
easy800-SWD
15
max
1
1.5
2
2.5
Scan time T
a
10 ms
0.01 T
g
.
t/T
G
the
g
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