Chapter 3 Function List - Mitsubishi Electric MELSEC iQ-R Series User Manual

3
FUNCTION LIST
The following table lists the functions of the A/D converter module. For further details on the function, refer to the following.
 MELSEC iQ-R Analog-Digital Converter Module User's Manual (Application)
Item
Range switching function
A/D conversion enable/disable setting function
A/D conversion Sampling processing
method
Averaging
processing
Primary delay filter
Scaling function
Shift function
Digital clipping function
Difference conversion function
Maximum value/minimum value hold function
Alert output Process alarm
function
Rate alarm
Input signal error detection function
Logging function
Logging read function
Interrupt function
Inter-module synchronization function
Error history function
Event history function
Offset/gain setting
Backing up, saving, and restoring offset/gain values
Online module change
Description
Allows switching the input range of an analog input for each channel. Switching the range makes it
possible to change the input signal characteristics.
Controls whether to enable or disable the A/D conversion for each channel. Disabling the A/D
conversion on unused channels reduces the A/D conversion cycles.
Executes A/D conversion of analog input values sequentially and stores the digital output values to
the buffer memory areas.
Time average Executes A/D conversion for a set time, and calculates the average of the total value excluding the
maximum value and the minimum value to store it in the buffer memory area. The number of
processing times within the set time changes depending on the number of channels where the A/D
conversion is enabled.
Count average Executes A/D conversion for a set number of times, and calculates the average of the total value
excluding the maximum value and the minimum value to store it in the buffer memory area. The
time taken to store the average value obtained by the average processing in the buffer memory
area changes depending on the number of channels where the A/D conversion is enabled.
Moving average Averages digital output 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 digital output value can
be obtained.
Performs digital output where the transient noise of analog input is smoothed depending on the set
time constant, and stores the value in the buffer memory area.
Performs scale conversion on digital output values within a specified range between a scaling
upper limit value and a scaling lower limit value. This function reduces the time and effort to create
a program of the scale conversion.
Adds (shifts) a set conversion value shift amount to a digital output value and stores the result in the
buffer memory area. The digital operation value reflects the change in the conversion value shift
amount on a realtime basis. Therefore, fine adjustment can be easily performed when the system
starts.
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.
Subtracts a difference conversion reference value from a digital operation value and stores the
acquired value in the buffer memory area.
Stores the maximum and minimum values of digital operation values to the buffer memory area for
each channel.
Outputs an alert when a digital operation value enters the preset alert output range.
Outputs an alert when the change rate of a digital output value is equal to or more than the rate
alarm upper limit value, or the rate is equal to or less than the rate alarm lower limit value.
Detects an analog input value that is above or below the set range.
Logs (records) digital output values or digital operation values. 10000 points of data can be logged
for each channel.
Makes it possible to store more than 10000 points of logging 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 an input signal
error or alert output is detected.
Allows the A/D conversion values to be held simultaneously among multiple modules in which the
inter-module synchronization function is active.
Records up to the 16 errors and alarms that occurred in the A/D converter module to store them
into the buffer memory area.
Collects occurred errors and alarms, and performed operations in the A/D converter module as
event information into the CPU module.
Corrects errors in digital output values.
Makes it possible to back up, save, and restore the offset/gain values of the user range setting.
Allows module replacement without stopping the system. For the procedure of the online module
change, refer to the following.
 MELSEC iQ-R Online Module Change Manual
3 FUNCTION LIST
19
3