YOKOGAWA UP35A, User Manual

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8-24
IM 05P02D41-01EN
8.4.4 Switching PID According to Target SP
Description
The zone PID selection by target SP switches between the groups of PID parameters
according to the target SP.
The figure below shows the example of switching the group of PID parameters according
to the target SP. It shows an example of dividing the PV input range from the maximum
value to the minimum value into four zones by reference points 1 to 3. (Set RP1 to RP3.)
SP
250ºC
100ºC
350ºC
800ºC
Target SP is
changed from
100ºC to 350ºC
Target SP is
changed from
350ºC to 250ºC
Target SP is
changed from
250ºC to 800ºC
(PID of group 4)
(PID of group 3)
(PID of group 2)
(PID of group 1)
Time
PID of group 1 PID of group 3 PID of group 2 PID of group 5
Reference point 3
Target SP
Current SP
Reference point 2
Reference point 1
Maximum value of
PV input range
Minimum value of
PV input range
PID No. to be selected
The PV input range can be divided into the number of zones that is set in the reference
point.
Reference deviation can be set at the same time.
► Reference deviation: 8.4.5 Switching PID according to Deviation (Reference Deviation)
8.4 Switching PID