5-11
Chapter 5. FUNCTIONS
■
PID set selection
• Eight sets of PID parameters, PID1 to PID8, are
used for control operation. When the PID set No.
is set to each segment by designating the PID set
segment, control output is calculated by each of
the PID parameters.
• There are two ways of selecting PID sets: by des-
ignating the PID set segment and PID set auto-
switching. The method can be selected by setting
setup data
C
1
1
.
C
1
1
set to 0: Designation of PID set segment
C
1
1
set to 1: PID set auto-switching
These two methods cannot be set simultaneously.
Note
When setup data
C
1
1
is set to 1, PID items in
the program setup are not displayed.
• By designation of PID set segment, the PID set
No. is set for each segment, and control output is
calculated by each of the PID parameters.
• By PID set auto-switching, the SP full-scale is
divided into eight zones according to the settings
of
C
P
.
1
1
to
C
P
.
1
7
, and the PID constant to
be used according to the SP value is automatically
selected to calculate the control output.
1
2
4
3
PID set No.
PID set segment designation
Zone 8
Zone 7
Zone 6
Zone 5
Zone 4
Zone 3
Zone 2
Zone 1
All SP ranges
are divided to
eight zones.
PID set automatic switching
CP.
1
7
CP.
16
CP.
15
CP.
14
CP.
13
CP.
12
CP.
1
1
