Omron CS1W-CT021, Operation Manual

Page: 103 / 201

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Section 3-7
++
3-7-3 Hysteresis
An encoder can come to rest at a particular position and then “oscillate” around
this position. This state means that the Counter Value fluctuates around a partic-
ular value. If, for example, a Range Limit is in this area of fluctuation, the corre-
sponding Range would become active and inactive in the rhythm of these
fluctuations. To prevent outputs from being switched ON and OFF by very small
fluctuations, the High-speed Counter Unit offers the Hysteresis Function that can
be configured for every Counter separately. You can assign Hysteresis in a range
from 1 to 255 counts (= 0001
H
– 00FF
H
) from which the Counter treats the fluctu-
ation in the Counter Input Signal as a real change and outputs can be controlled
accordingly.
Configuring Hysteresis
Note 1. The Hysteresis can only be applied to Units in Range Mode. If the Unit is in
Comparison Mode you are able to configure Hysteresis yourself using Compar-
ison Values.
2. Do not preset in a hysteresis area. If you do preset in a hysteresis area the
output pattern of the corresponding range may be on or may not be on.
Lower
Range Limit
Range Active
Down-Counting
Up-Counting
Upper
Range Limit
Range Inactive
Hysteresis Hysteresis
CNT1: CNT2: CNT3: CNT4:
m+63 m+108 m+153 m+198
Hysteresis:
0000 = No Hysteresis
Set Hysteresis in number of counts between 0001-0255 (= 0001
H
– 00FF
H
)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
W902-E2-03.book Seite 88 Donnerstag, 7. Oktober 2004 2:06 14