Function Comparison - Mitsubishi Electric MELSEC-A/QnA Series Handbook

2
ANALOG INPUT MODULE REPLACEMENT

2.6.2 Function comparison

Item
A/D conversion enable/disable
Sampling processing
Averaging processing
Primary delay filter
Maximum and minimum values
hold function
Resolution mode
Input signal error detection
function
Warning output function
Scaling function
Online module change
*1 For the A68AD-S2, the resolution for voltage is 1/2000 and that for current is 1/1000 (fixed).
For the Q68AD-G, the resolution for voltage and current is 1/4000 in the normal resolution mode, while the resolution for the
voltage from -10 to 10V is 1/16000 and the resolution for the voltage in other ranges and current is 1/12000 in the high
resolution mode.
2
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Description
Specifies whether to enable or disable the
A/D conversion for each channel.
By disabling the conversion for the
channels that are not used, the sampling
time can be shortened.
The A/D conversion for analog input values
is performed successively for each channel,
and the digital output value is output upon
each conversion.
For each channel, A/D conversion values
are averaged for the set number of times or
set amount of time, and the average value
is output as a digital value.
Moving average takes the average of the
specified number of digital output values
measured per sampling time.
A digital output value is smoothed
according to the preset time constant.
The maximum and minimum values of the
digital output values are retained in the
module.
The resolution can be switched according to
the application. The resolution mode is
*1
batch-set for all the channels.
The voltage/current outside the setting
range is detected.
(1) Process alarm
A warning is output if a digital output
value falls outside the setting range.
(2) Rate alarm
A warning is output if the varying rate of
a digital output value falls outside the
preset varying rate range.
Conversion of A/D conversion values to
preset percentage values and loading into
the buffer memory is available.
Programming steps for the scaling can be
eliminated.
A module change is made without the
system being stopped.
: With functions, -: Without functions
A68AD-S2 Q68AD-G Precautions for replacement
The setting range of average
time and count differ.
Refer to Q68AD-G [User's
Manual] and then, confirm the
- specifications.
-
-
-
-
-
-
Replaceable modules during
- online are a process CPU and a
redundant CPU.