Application Example - IDEC MICROSmart FC6A Series Ladder Programming Manual

Application Example

This section describes an application example using the PIDA instruction.
Note: You must change the settings according to the application's actual system configuration and operating status.
The following two system configurations are described for applications that set the set point for the control target temperature to
200°C and perform PID control.
• PID control via ON/OFF output
• PID control via analog output
Operation
• PID control is performed based on the temperature input to the analog I/O cartridge and the manipulated variable is output.
The set point is 200ºC.
• The control mode is PID (PID control) and the control action is reverse control action.
• Alarm 1 output (S3+3) is turned ON when the process variable reaches 250°C, and the heater is stopped or the power is adjusted.
PID control via ON/OFF output
System configuration
I0
FC6A-PJ2CP
RTD
TC
+ –
Thermocouple
Heater
IN0
A B B'
+ -
NC
COM0( + )
Q0 Q1
Alarm Lamp
+
–
Fuse
SSR
(Solid State Relay)
FC6A S MICROS
ERIES MART
V0(-)
L P M
ADDER ROGRAMMING ANUAL
19: PID C
ONTROL
FC9Y-B1726
I
NSTRUCTION
19-45