Basic Loop Types Available By Combinations Of Process Control Instructions - Mitsubishi MELSEC-Q series Programming Manual

2.3
Basic Loop Types Available by Combinations of Process
Control Instructions
Loop type
2-degree-of-freedom PID
control
(S2PID)
PID control
(SPID)
PIDP control
(SPIDP)
Sample PI control
(SSPI)
I-PD control
(SIPD)
Blend PI control
(SBPI)
Ratio control
(SR)
2-position ON/OFF control
(SONF2)
3-position ON/OFF control
(SONF3)
Batch counter
(SBC)
22
Structure
SET
PV
S.IN S.PHPL S.2PID
INPUT
SET
PV
S.IN S.PHPL S.2PID
INPUT
SET
PV
INPUT S.IN S.PHPL S.PID
SET
PV
S.IN S.PHPL S.PID
INPUT
SET
PV
S.IN S.PHPL S.PIDP
INPUT
SET
PV
S.IN S.PHPL S.SPI
INPUT
SET
PV
S.IN S.PHPL S.IPD
INPUT
SET
PV
S.IN S.PHPL S.BPI
INPUT
SET
PV
S.IN S.PHPL S.R
INPUT1
SET
PV
S.IN S.PHPL S.ONF2
INPUT
SET
PV
S.IN S.PHPL S.ONF3
INPUT
S.PSUM S.BC
INPUT
SV
MV
S.OUT1
OUTPUT
SV
MV
S.DUTY
OUTPUT
SV
MV
S.OUT1 OUTPUT
SV
MV
S.DUTY
OUTPUT
SV
MV
OUTPUT
SV
MV
S.OUT1
OUTPUT
SV
MV
S.OUT1
OUTPUT
SV
MV
S.OUT1
OUTPUT
SV
MV
S.OUT2
OUTPUT
SV MV
OUTPUT
SV MV
OUTPUT
OUTPUT
Application
Used for general PID control (2-degree-
of-freedom). (velocity type)
Conducts PID operations for each
control cycle.
Used for general PID control. (velocity
type)
Conducts PID operations for each
control cycle.
Used for general PID control. (Position
type)
Conducts PID operation for each
control cycle.
Used for a process that has long dead
time.
PI control is executed for only the
period of control execution time in each
control cycle and the output is kept
constant after that.
Used to make slow response so that
the operation end and process are not
given impact when the set value is
varied.
Used for a process where the
manipulated value may vary in a short
period of time and may be constant in a
long period of time.
Control is performed to keep constant
the ratio of the given manipulated value
to the other varying value.
Depending on the sign (positive/
negative) of a deviation, operation to
turn the manipulated value ON or OFF
is performed.
3-position ON/OFF control outputs
signals of three areas in response to
the process value to carry out control.
This control can suppress the sudden
variation of the manipulated value.
A valve or like is controlled ON/OFF in
a process of batch preparation for a
tank or like.