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Basic Examples of PID Control Section 5-1
Step Ladder Program block and the arrival at final signal to the Step Ladder
Program block.
5-1-6 Time-proportional Control
Follow the procedure below to perform time-proportional control where con-
tact output (ON/OFF) changes proportionately to the ON/OFF time ratio.
Function blocks used: Basic PID (Block Model 011)
Analog/Pulse Width Converter (Block Model 192)
Assign the MV of the PID function block to the Analog/Pulse Width Converter
block. The Analog/Pulse Width Converter block outputs the ON/OFF pulse
signal obtained by changing the ON and OFF times proportionally to MV.
PIDPV MV
Ramp program
RSP
Time
SP
AI 4-point Terminal
Block Model 586
PV
Basic PID
Block Model 011
Analog input
MV
Analog output
Ramp Program
Block Model 155
Step Ladder Program
Block Model 301
RSP
Arrival at final st 200
AO 4-point
Terminal Block
Model 587
Operation instruction
PID
PV
MV
SSR
Analog/Pulse Width Converter
Time-proportional output
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