38
3.3
Function List
(1) Common Functions
(2) When the module is used as a temperature input module
(3) When the module is used as a temperature control module
Item
Description
Reference
Operation/stop
function
Whether to operate or stop the temperature conversion and the temperature control can be set for each
channel.
Temperature
conversion method
A measured value is stored into CH
Temperature process value (PV) (RWr8 to RWrB) in every
sampling cycle. In addition, the use of the primary delay digital filter smoothens the temperature
process value (PV), and its drastic change can be absorbed.
Moving averaging
process to a
temperature process
value (PV)
Moving averaging process 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 averaging
process can be disabled to hasten the response to the change of temperature process values (PV).
Temperature process
value (PV) scaling
function
The temperature process value (PV) is scaled up or down to the value in a set range, and can be stored
into the remote register using this function.
Sensor correction
function
When a difference occurs between the temperature process value (PV) and the actual temperature due
to reasons such as a measuring condition, the difference can be corrected using this function. The
following two types are available.
• Normal sensor correction (one-point correction) function: The percentage of the full scale of the set
input range can be corrected as an error corrected value.
• Sensor two-point correction function: With this function, the difference between the temperature
process value (PV) and the actual temperature between the two points selected in advance (a
corrected offset value and a corrected gain value) is stored. Based on this gradient, the difference
between a sensor and the actual temperature is corrected.
Auto-setting at input
range change
When an input range is changed, using this function automatically changes related parameter data to
prevent an error outside the setting range.
Set value backup
This function allows remote buffer memory data to be stored in the non-volatile memory and backed up.
The backed-up data is transferred from the non-volatile memory to the remote buffer memory when the
power is turned off and on. Therefore, temperature can be controlled without newly writing data when
the power is turned off and on.
Item
Description
Reference
Alert output function
An alert can be output when the temperature process value (PV) meets the condition set in advance
using this function. There are two types of alert: process alarm and rate alarm.
Item
Description
Enable or disable
Reference
Standard
control
Heating-
cooling
control
Control mode selection
function
A control mode can be selected using this function.
• Standard control
• Heating-cooling control (normal mode)
• Heating-cooling control (expanded mode)
• Mix control (normal mode)
• Mix control (expanded mode)
HOLD/CLEAR function
Whether to continue or stop the control when a stop error of the CPU module
occurs or the communication is disconnected can be selected using this
function.
Control method
The following control methods can be used with the settings of proportional
band (P), integral time (I), and derivative time (D).
• Two-position control
• P control
• PI control
• PD control
• PID control
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