C6-16
IM 34M06H62-02E 2nd Edition : June 2008-00
Zone Switching Hysteresis
The Zone Switching Hysteresis (RHY) parameter can be used to define a hysteresis
when switching between zones.
Zone switching hysteresis comes into play when the Current PID Number (PIDNO)
parameter is reduced, say, from 3 to 2, or from 2 to 1. It also applies when operation is
switched from PID parameter group 1, 2 or 3 to group 4, according to the Reference
Deviation (RDV) parameter.
PID 1
Reference point 1
Zone switching
hysteresis width
PV
PID 2 PID 1 PID 2
Figure C6.15 Hysteresis Width
Table C6.10 Parameters Related to Hysteresis
Data Position Number
Symbol
Description Unit Data Range Default Value Attribute
Stored
Loop1 Loop2 Loop3 Loop4
188 388 588 788 RHY Zone Switching Hysteresis
Industrial
unit
0 to (PRH-PRL) (PRH – PRL)×0.5% RW
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