5 Function blocks
5.14 FT, signal smoothing filter
Control Relay easy800
11/11 MN04902001Z-EN
www.eaton.com
195
Cycle time to scan time: The scan time should be very large, approx. factor
10 compared to the cycle time, in order to ensure the correct ratio of cycle
time t
cyc
to scan time T
a
. The scan time T
a
is set indirectly via the value for
the recovery time T
g
(see above table).
The following applies: t
cyc
<< T
a
Some applications exist in which this condition cannot be reached. In this
case you should set the cycle time using the ST function block (set cycle
time) so that the scan time is an integer multiple of the cycle time.
t
cyc
n = T
a
with n = 1, 2, 3, …
The function block always operates with a scan time that corresponds to an
integer multiple of the cycle time. This can cause the set recovery time to be
lengthened.
