4 FUNCTIONS
4.1 Function List
25
4
4.1
Function List
This chapter lists the functions of multiple input module.
Item
Description
Reference
Operation mode
Select the operation mode (normal mode, 2CH conversion mode, offset/gain setting
mode) of the multiple input module.
Input type/Range setting function
Input type, and input range can be checked for each channel. Disabling the
conversion on unused channels reduces the conversion cycles.
Conversion
method
Sampling processing
Converts analog input values and temperature conversion values at every sampling
period, storing them in buffer memory areas.
Averaging
processing
Time average
Executes A/D conversion and temperature conversion for the set time and performs
the average processing on the total value excluding the maximum and minimum
values. The values that had the average processing are stored in the buffer memory
areas. The number of processing times within the set time varies depending on the
number of channels where the conversion is enabled.
Count average
Executes A/D conversion and temperature conversion for a set number of times and
performs the average processing on the total value excluding the maximum and
minimum values. The values that had the average processing are stored in the buffer
memory areas. 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 digital output values taken at every sampling period for a specified number
of times, and stores the averaged value in the buffer memory area. The target range
for averaging processing moves at each sampling period, thereby allowing the latest
digital output value to be obtained.
Scaling function
Performs scale conversion on digital operation values within the range from a scaling
upper limit value to a scaling lower limit value, both of which are set at desired
values. This function helps reduce the time taken for creating a scale conversion
program.
Alert output
function
Process alarm
Outputs an alert when a digital operation value falls within the preset alert output
range.
Rate alarm
This function outputs an alert when the change rate of a digital output value is equal
to or greater than the rate alarm upper limit value, or the rate is equal to or smaller
than the rate alarm lower limit value.
Disconnection detection function
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
Input signal error
detection
function
Upper limit detection, lower limit
detection, upper and lower limit
detection
Outputs an alarm when an analog input value exceeds the preset range.
Simple disconnection detection
Outputs an alarm when an analog input value is 0.5 V or smaller or 2 mA or smaller.
Shift function
Adds (shifts) a set conversion value shift amount to a digital output value, and stores
the result in the buffer memory area. A change in conversion value shift amount is
reflected to the digital operation value in real time, which facilitates fine adjustment at
system start-up.
Digital clipping function
Fixes a possible digital operation value to the maximum digital output value or the
minimum digital output value when an input current or voltage exceeds the input
range.
Maximum Value/Minimum Value Hold Function
Stores the maximum and minimum values of digital operation values in the buffer
memory area for each channel.
Logging function
Logs (records) digital output values or digital operation values. 10000 points of data
can be logged for each channel.
Offset/gain setting function
Allows the correction of errors in digital output values.
FX2N allocation mode function
Allows to convert the layout of buffer memory addresses of a multiple input module
to the one equivalent to FX2N-8AD. This compatibility enables the reuse of
programs that have proven performance on FX2N-8AD.
2CH conversion mode function
Performs A/D conversion of 2CH to 1 ms and can update the digital output value at
the same time.
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