3 FUNCTION LIST
23
3
Derivative action selection function
This function improves dynamic characteristics by
selecting a suitable derivative action for fixed value
actions or ramp actions.
Simple two-degree-of-freedom
In addition to the PID control, this function selects a
suitable response speed for the set value (SV) change
from three levels to simply achieve the two-degree-of-
freedom PID control.
Auto-setting at input range change
When the input range is changed, the related buffer
memory data is automatically changed to prevent the
values in those buffer memory areas from being out of
the setting range.
Setting variation rate limiter setting
function
Setting change rate limiters for the temperature rise and
the temperature drop can be set in a batch or
individually.
Sensor correction function
When there is an error between the temperature
process value (PV) and actual temperature due to
measurement conditions, this function corrects the
error. Select one of the following two correction
methods.
• Normal sensor correction (one-point correction)
function: Corrects the error using a set value as the
error correction value.
• Sensor two-point correction function: Sets two points
(correction offset value, correction gain value) to
correct the error.
Primary delay digital filter
By setting the primary delay digital filter, a temperature
process value (PV) with smoothed transient noise can
be output.
Moving average processing
Moving average processing can be set to a temperature
process value (PV). With this function, the fluctuation of
temperature process values (PV) can be reduced in
electrically noisy environments or in the environments
where temperature process values (PV) fluctuate
greatly. The moving average processing can be
disabled to hasten the response to the change of
temperature process values (PV).
Scaling function
This function can convert temperature process values
(PV) into the set width to import them in the buffer
memory.
ON delay output function
This function enables users to configure settings
considering the delay time (response/scan time delay)
of an actual transistor output.
Input/output (with another analog
module) function
This function can input and output with other analog
modules (including A/D converter module and D/A
converter module) on the system.
The position proportional control can use input only.
Alert function
This function issues an alert when a temperature
process value (PV) or deviation (E) meets the condition
set in advance.
Heater disconnection detection
function
The current which flows in the heater main circuit can be
measured and disconnections can be detected.
Output off-time current error
detection function
An error of when the transistor output is off can be
detected.
Loop disconnection detection
function
The current which flows in the heater main circuit can be
measured and disconnections can be detected.
Loop disconnection detection
during AT function
This function detects loop disconnections during AT
(auto tuning).
Peak current suppression function
This function suppresses the peak current by
automatically changing the values of the upper limit
output limiter of each channel and dividing the timing of
the transistor output.
Simultaneous temperature rise
function
This function allows several loops to reach the set value
(SV) at the same time.
Item
Description
Availability
Standard
control
Heating-
cooling control
Position
proportional control
Summary of Contents for MELSEC iQ-R series
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