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3 Operation and Configuration
3-42
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
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 particular value. If, for example, a Range Limit is in
this area of fluctuation, the corresponding 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 sepa-
rately. You can assign Hysteresis in a range from 1 to 255 counts (= 0001
H
– 00FF
H
) from which the
Counter treats the fluctuation in the Counter Input Signal as a real change and outputs can be con-
trolled accordingly.
z
Configuring Hysteresis
Additional Information
• 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 Comparison Values.
• Do not set the origin (i.e., an actual value of 0) within the Hysteresis area.
• If the Counter is Preset, turn OFF the Hysteresis. If the Counter is Preset in the Hysteresis
area, the Outputs will not be controlled correctly.
3-7-2 Hysteresis
Name of device variable
for CJ-series Unit
Type Name Function
*_Ch1_HystrsCfg UINT Hysteresis Sets the hysteresis.
For 0, the hysteresis function is disabled.
Data range: 0 to 255
Unit: Pulse
*_Ch2_HystrsCfg
Down-Counting
Up-Counting
Hysteresis Hysteresis
Range Active
Range Inactive
Lower
Range Limit
Upper
Range Limit