2 CPU MODULE INSTRUCTIONS
2.7 Process Control Instructions
123
2
Control operation instructions
■Basic PID control
■Two-degree-of-freedom PID control
■Position type PID control
■Sample PI control
■I-PD control
■Blend PI control
■Ratio calculation
■Upper/lower limit alarm
■Lead-lag compensation
■Integral control
Instruction symbol Processing details Reference
S.PID Performs process value derivative type (inexact differential) PID operation.
The instruction performs the following processing steps: SV setting, tracking, gain (Kp) operation,
PID operation, and deviation check.
Page 1232 S.PID
Instruction symbol Processing details Reference
S.2PID Performs two-degree-of-freedom PID control operation (inexact differential).
The instruction performs the following processing steps: SV setting, tracking, gain (Kp) operation,
two-degree-of-freedom PID control operation, and deviation check.
Page 1239 S.2PID
Instruction symbol Processing details Reference
S.PIDP Performs position type PID operation.
The instruction performs the following processing steps: SV setting, tracking, gain (Kp) operation,
PID operation, deviation check, and control mode determination.
Depending on the operation result up to the mode determination processing, the instruction
performs either variation rate & upper/lower limiter and output conversion, or alarm clear and
output conversion processing.
Page 1246 S.PIDP
Instruction symbol Processing details Reference
S.SPI Monitors the operating time (operating time (ST) or hold time (HT)), and performs the following
processing steps: SV setting, tracking, gain (Kp) operation, SPI operation, and deviation check if
the operating time is in ST.
Page 1254 S.SPI
Instruction symbol Processing details Reference
S.IPD Performs I-PD operation.
The instruction performs the following processing steps: SV setting, tracking, gain Kp operation,
IPD operation, and deviation check.
Page 1262 S.IPD
Instruction symbol Processing details Reference
S.BPI Performs blend PI operation.
The instruction performs the following processing steps: SV setting, tracking, gain Kp operation,
BPI operation, and deviation check.
Page 1269 S.BPI
Instruction symbol Processing details Reference
S.R Performs the following processing steps to the input data: engineering value transformation,
tracking, variation rate limiter, and ratio calculation.
Page 1276 S.R
Instruction symbol Processing details Reference
S.PHPL Checks the range of the PV that has been output by the S.IN instruction. Page 1281 S.PHPL
Instruction symbol Processing details Reference
S.LLAG Performs lead-lag compensation to the input data, and outputs the operation result. Page 1287 S.LLAG
Instruction symbol Processing details Reference
S.I Performs integration operation to the input data, and outputs the operation result. Page 1290 S.I
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