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Temperature Control
The high-level PID control easily achieves high-speed, high-accuracy
multi-point temperature control.
■ New PID Command (F356 EZPID) Produces a Temperature
Control Program only in a Single Line.
●The application of PLC-based temperature control has been
expanding such as multi-level temperature control, timer-
controlled temperature control, and a temperature control
relative to a variable based on a data computation results
etc. By using the new PID command (F356 EZPID), a PID
control program can be drastically simplified and the PLC-
based temperature control, which was previously thought
to be difficult by a PLC, can easily be achieved. The
example on the right, a simple uniform temperature control,
enables a surprisingly easily PID control with a single line
command by using a F356 command combined with a
touch-panel operation.
Thermocouple
SSR
Heater
PWM output
■ Multi-point PID control
●High-accuracy PID control is possible by adopting a sophisticated
algorithm and floating-point operations.
●Higher accuracy is obtained by ultra high-speed computations in a
32 µs/loop. For example, a 16-loop control only adds a scan time of
0.5 ms by ensuring minimum impact on the tact time.
●The simultaneous multi-point auto-tuning simplifies complex
parameter setting.
●The high-speed control PI-D*
mode are available for selection according to the intended application.
●By combining with a sequence control, the parameters (Kp, Ti, Td, etc.)
can be changed during a PID control execution, thereby enabling
optimum temperature control in each stage including start up, mid-
range, and convergence.
The ability to change the target value easily enables multi-step
temperature control, which was difficult only with temperature
controllers. In addition, the multi-point temperature control enables
the centralized control of multiple temperature controllers with a
single FP-X for unified data management.
*1 Derivative type
*2 Proportional-derivative type
Two modes are selectable
PI-D mode
Target
value
I-PD mode
°C
Constant Temperature
1
mode and overshoot suppression I-PD*
Partial optimum control by changing parameters
High-speed PID
Target
value
Time
When using the
previous F355 command
Parameter setup
• Target value
• Control code
• PID control elements
Auto-tuning setup
Start bit ON
Auto-tuning end
Start bit OFF
Parameter storage
PID command execution
Bit processing
PWM output
frequency setup
Timer set value
t
conversion
R0
PWM output circuit
PWM output
2
FP-X
control
Overshoot suppression
Rapid acceleration
Smooth startup
Time
When using the new
F356 PID command
Touch Panel
• Target value setup
• Auto-tuning execution
Program
Executing F356 PID command
Only a
single line
F356 EZPID, WR1,
WX1,
DT0,
Control code
Measured value Target value Output value
Modbus-RTU
Easy unification of
data management
T/C
T/C
T/C
T/C
The number can even be increased up to 28 channels by using
the thermocouple input cassette and FP0 thermocouple unit.
Multi-step control by changing the target value
Target value
Y0
DT100
Output address
Multiple temperature
controllers
T/C
Time
11
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