22
3 FUNCTION LIST
3
FUNCTION LIST
The following table lists the functions of the temperature control module. For details on each function, refer to the following.
MELSEC iQ-R Temperature Control Module User's Manual (Application)
: Available,
: Not available
Item
Description
Availability
Standard
control
Heating-
cooling control
Position
proportional control
Control mode selection function
A control mode can be selected from the following
modes.
• Standard control
• Heating-cooling control (normal mode)
• Heating-cooling control (expanded mode)
• Mix control (normal mode)
• Mix control (expanded mode)
• Position proportional control (normal mode)
• Position proportional control (expanded mode)
Control method
Two-position
control
By the settings of proportional band (P), integral time (I),
and derivative time (D), each control method can be
performed
P control
PI control
PD control
PID control
Sampling cycle switching function
A sampling cycle can be selected from the following.
• 500ms
• 250ms
HOLD/CLEAR function
Whether to clear or hold the transistor output status
when a CPU module stop error occurs or when a CPU
module is turned from RUN to STOP can be selected.
Overlap/dead band function
By changing the temperature where the cooling
transistor output is started, whether control stability is
prioritized or energy saving is prioritized can be
selected.
Manual reset function
This function is used to manually move a stable position
in the P control or PD control.
Cooling method setting function
At the execution of auto tuning, an auto tuning
operational expression is automatically selected
according to a selected cooling method and an
operation is started.
Temperature conversion function
(using unused channels)
In the heating-cooling control (normal mode), mix
control (normal mode), or position proportional control
(normal mode), only the temperature measurement can
be performed using unused temperature input
terminals.
Manual control
A manipulated value (MV) can be set manually by users
without being automatically calculated by the PID
control.
Auto tuning function
The temperature control module automatically sets
suitable PID constants.
Self-tuning function
The temperature control module constantly monitors the
control state. When the control system is oscillatory just
after the control start, owing to the set value (SV)
change or fluctuation of characteristics of a controlled
object, this function allows PID constants to be
automatically changed.
Direct/reverse action selection
function
Whether to execute a PID operation with a direct action
or a reverse action can be selected.
RFB limiter function
When deviation (E) continues for a long period of time,
this function prevents the PID operation results
(manipulated value (MV)) calculated by integral actions
from exceeding the effective range of the manipulated
value (MV).
Summary of Contents for MELSEC iQ-R series
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