YOKOGAWA F3CU04-0S, User Manual

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C6-14
IM 34M06H62-02E 2nd Edition : June 2008-00
C6.9.1 SP Number Selection
Setting the Zone PID Selection (ZONE) parameter to “0: Disabled” selects SP Number
Selection as the PID selection method.
The SP Number Selection method switches the set point (1.SP to 4.SP) and the PID
parameter group concurrently. It is used in batch control where the set point and PID
values are to be changed at the same time.
Use the SP Number Selection (SPNO) parameter to switch the set point and PID
parameter group.
The number specified by the SPNO parameter becomes the Current SP Number
(CSPNO) parameter and the Current PID Number (PIDNO). Changing the SPNO also
activates the PV tracking function (see Section C4.5, “PV Tracking”).
Switching from
1.SP to 3.SP
Switching from
3.SP to 1.SP
Switching from
1.SP to 2.SP
Increases
according to SP
Up Gradient
Time
Decreases
according to SP
Down Gradient
Increases
according to SP
Up Gradient
1.SP
PV
(No.1PID)
3.SP
(No.3PID)
1.SP
(No.1PID)
2.SP
(No.2PID)
Figure C6.13 Switching of Set Point Accompanied by Change in PID Constant Group
(when switching to PV=nSP)
TIP
If the Remote/Local Selection (RMT/LOC) parameter is set to “1: Remote”, control and computation
proceeds with the value of the Remote Set Point (RSP) parameter and the PID values of the PID
parameter group specified by the SP Number Selection (SPNO) parameter.