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3
FUNCTION LIST
This chapter lists the functions of temperature input modules. For details on the functions, refer to the following.
MELSEC iQ-R Channel Isolated Thermocouple Input Module/Channel Isolated RTD Input Module User's Manual
(Application)
Item
Input range setting function
Conversion enable/disable setting function
Temperature
Sampling processing
conversion method
Averaging
processing
Primary delay filter
Scaling function
Alert output function
Process alarm
Rate alarm
Disconnection detection function
Cold junction compensation setting function
Cold junction compensation resistor disconnection detection
function
Logging function
Logging read function
Interrupt function
Error history function
Event history function
Offset/gain setting
Backing up, saving, and restoring offset/gain values
Description
Allows to select the thermocouple type or resistance temperature detector type to be used
as well as the input range for each channel.
Sets whether to enable or disable the temperature conversion for each channel. Disabling
the conversion on unused channels reduces the conversion cycles.
Executes the conversion of temperature input values every sampling cycle and stores the
converted values in buffer memory areas as measured temperature values.
Time average
Executes the temperature conversion for set time and averages the total value excluding
the maximum value and the minimum value. The calculated value is stored in the buffer
memory area. The number of processing times within the set time varies depending on
the number of channels where the conversion is enabled.
Count average
Executes the temperature conversion for a set number of times and averages the total
value excluding the maximum value and the minimum value. The calculated value is
stored in the buffer memory area. The time taken to store the average value obtained by
the processing in the buffer memory area varies depending on the number of channels
where the conversion is enabled.
Moving average
Averages measured temperature values taken at every sampling cycle for a specified
number of times, and stores the averaged value in the buffer memory area. Because the
target range for averaging processing is moved in response to every sampling
processing, the latest measured temperature value can be obtained.
Performs the conversion where the transient noise of temperature input is smoothed
depending on the set time constant. The smoothed measured temperature value is stored
in the buffer memory area.
Performs scale conversion from a measured temperature value to a value calculated
using the ratio (%) of the set scaling width to the set scaling range. The converted value is
stored in the buffer memory area.
Outputs an alert when a measured temperature value enters the preset alert output
range.
Outputs an alert when the change of a measured temperature value is equal to or greater
than the rate alarm upper limit value, or equal to or smaller than the rate alarm lower limit
value.
Outputs an alarm when disconnection of a thermocouple, compensation lead wire, or
resistance temperature detector is detected. A measured temperature value to be stored
at the disconnection detection is selected from the following.
• Value just before disconnection
• Upscale
• Downscale
• Any value
Enables two types of cold junction compensation (using a cold junction compensation
resistor or an external method (cooling bath)) by setting whether to use a cold junction
compensation resistor.
Outputs an error when disconnection of a cold junction compensation resistor (RTD) is
detected.
Logs (records) measured temperature values or scaling values. Data of 1000 points can
be logged for each channel.
Allows to store more than 1000 points of data without stopping logging by transferring the
device data to the file register of the CPU module during logging. This function reduces
the takt time in a test demanding high-speed conversion.
Executes an interrupt program of the CPU module when an interrupt factor such as alert
output or disconnection is detected.
Records up to 16 errors and alarms that occurred in a temperature input module to store
them in the buffer memory areas.
Collects occurred errors and alarms, and performed operations in a temperature input
module, and stores them as event information into the CPU module.
Corrects errors in measured temperature values.
Allows to back up, save, and restore the offset/gain values of the user range setting.
3 FUNCTION LIST
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