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

3
FUNCTION LIST
The following table lists the functions of the A/D converter module. For further details on the functions, refer to the following.
 MELSEC iQ-R Channel Isolated Analog-Digital Converter Module (With Signal Conditioning Function) User's Manual
(Application)
Item
Range switching function
A/D conversion enable/disable setting function
Conversion start time setting function
A/D conversion Sampling processing
method
Averaging
processing
Primary delay filter
Scaling function
Warning output Process alarm
function
Rate alarm
Input signal error Upper limit detection, lower limit
detection detection, upper and lower limit
function detection
Simple disconnection detection
Shift function
Digital clipping function
Difference conversion function
Maximum value/minimum value hold function
External power supply interruption detection function
Supply power temporary stop function
Logging function
Logging read function
Interrupt function
Error history function
3 FUNCTION LIST
20
Description
Allows the input range of analog input to be switched for each channel. Switching the range makes
it possible to change the I/O conversion characteristics.
Controls whether to enable or disable A/D conversion for each channel. Disabling A/D conversion
for unused channels reduces the conversion cycles.
Setting the A/D conversion start time makes it possible to start A/D conversion from the time an
output from the 2-wire transmitter becomes stable.
Converts analog input values into digital output values at every sampling period, storing them in
buffer memory areas.
Time average Executes A/D conversion for the set time and performs the averaging processing on the total value
excluding the maximum and minimum values. The average processed values are stored in the
buffer memory area. The number of processing times within the set time changes depending on the
number of channels where A/D conversion is enabled.
Count average Executes A/D conversion for a set number of times and performs the averaging processing on the
total value excluding the maximum and minimum values. The average processed values are stored
in the buffer memory area. The time taken to store the average value obtained by the count
average processing in the buffer memory area changes depending on the number of channels
where A/D 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.
Smooths the transient noise of analog input depending on the set time constant. The smoothed
digital output values are stored in the buffer memory area.
Performs scale conversion on digital output 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 reduces the time
and effort to create a program of the scale conversion.
Outputs a warning when a digital operation value falls within the preset warning output range.
Outputs a warning if the change rate of a digital output value is equal to or more than the rate alarm
upper limit value, or is equal to or less than the rate alarm lower limit value.
Outputs an alarm when an analog input value exceeds the preset range.
Outputs an alarm when an analog input value is 2mA or smaller.
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.
Fixes a possible digital operation value to the maximum digital output value or the minimum digital
output value when an input current exceeds the input range.
Subtracts a difference conversion reference value from a digital operation value and stores the
resulting value in the buffer memory area.
Stores the maximum and minimum values of digital operation values in the buffer memory area for
each channel.
Detects the state in which 24VDC from the external power supply is not supplied or is stopped.
Temporarily stops power supply requirements for 2-wire transmitter and A/D conversion for each
channel. This function makes it possible to replace the 2-wire transmitter safely while keeping A/D
conversion for other channels running.
Logs (records) digital output values or digital operation values. 1000 points of data can be logged
for each channel.
Makes it possible to store more than 1000 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 warning output is detected.
Records errors and alarms that have occurred in the A/D converter module, storing the record into
the buffer memory area. Up to 16 storage areas are provided for both errors and alarms.