Mitsubishi Electric MELSEC iQ-R Series - Basic Loop Types; Chapter 11 Process Control Instructions; Overview

11 PROCESS CONTROL INSTRUCTIONS
11.1 Overview
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11 PROCESS CONTROL INSTRUCTIONS
When a process control program is created, using process control function blocks is recommended
Process control function blocks have features as follows.
• A process control program can be easily created by placing and connecting FB elements.
• Since the initial value of the function block can be set in the "FB Property" window of the engineering tool,
the program for the initial value setting is not required.
• An operation constant can be input to a label indicating a tag name without being conscious of address of a
device.
• The operating status of a tag FB can be checked and controlled by accessing the tag data from the
faceplate of an engineering tool.
For details on the process control function blocks, refer to the following.
 MELSEC iQ-R Programming Manual (Process Control Function Blocks)
11.1 Overview
This section describes the loop type that can be configured by process control instructions, data configurations of the
instructions, instruction execution methods, and precautions.
Basic loop types
The following table summarizes basic loop types configured by combinations of process control instructions.
Loop type Configuration Application
Two-degree-of-freedom
PID control (S2PID)
Used for general PID control (two degrees of freedom). (Speed
type)
PID operation is performed every control cycle.
PID control (SPID) Used for general PID control. (Speed type)
PID operation is performed every control cycle.
PIDP control (SPIDP) Used for general PID control. (Position type)
PID operation is performed every control cycle.
Sample PI control (SSPI) Used for processes which involve much dead time.
PI control is executed only for the control execution time every
control cycle, and later output is held constant.
I-PD control (SIPD) Used to make a slow response so as not to give a shock to the
operation terminal and process when the set value is changed.
S.ININPUT OUTPUTS.PHPL S.2PID S.OUT1
SET
PV
SV
MV
S.ININPUT OUTPUTS.PHPL S.2PID S.DUTY
SET
PV
SV
MV
S.ININPUT OUTPUTS.PHPL
S.PID
S.OUT1
SET
PV
SV
MV
S.ININPUT OUTPUTS.PHPL S.PID S.DUTY
SET
PV
SV
MV
S.ININPUT OUTPUTS.PHPL S.PIDP
SET
PV
SV
MV
S.ININPUT OUTPUTS.PHPL S.SPI S.OUT1
SET
PV
SV
MV
S.ININPUT OUTPUTS.PHPL S.IPD S.OUT1
SET
PV
SV
MV