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

2
ANALOG INPUT MODULE REPLACEMENT

2.2.2 Function comparison

Item
Specifies whether to enable or disable the A/D
conversion for each channel.
A/D conversion enable/
By disabling the conversion for the channels
disable
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
Sampling processing
the digital output value is output upon each
conversion.
Sequence program separately from normal
sampling processing can specify channels to
carry out the A/D conversion, and outputting
the direct access request can perform direct A/
Direct access processing D conversion of specified channels.
When inputting channel specification with
sampling processing and direct access
processing simultaneously, the direct access
request is prioritized.
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.
Averaging processing
The setting range is as shown below:
Averaging processing by the number of times:
4 to 62500
Averaging processing by time: 2 to 5000ms
The maximum and minimum values of the
Maximum and minimum
digital output values are retained in the
values hold function
module.
Errors arising from changes in the ambient
temperature of the module are automatically
Temperature drift compensated to improve conversion accuracy.
compensation function The temperature drift compensation function
can be performed at (A/D conversion time for
all channels) + 160µs.
The resolution settings of 1/4000, 1/12000 or
1/16000 can be selected according to the
Resolution mode application.
The resolution mode setting is applicable to all
channels.
A module change is made without the system
Online module change
being stopped.
2
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Description A616AD Q68ADV/I
: With functions, -: Without functions
Precautions for replacement
-
The sampling processing time
changes depending on the number of
channels used (number of channels
set to A/D conversion enable) and
whether, with or without the
temperature drift compensation
function.
(a) Without temperature drift
compensation function (processing
time) = (number of channels used)
× 80 (µs /1 channel)
(b) With temperature drift
compensation function (processing
time)= (number of channels used)
× 80 (µs /1 channel) +160µs
Q68ADV/I does not have [Direct
-
access processing] function.
-
-
-
-
The CPUs corresponding to online
- module replacement are process CPU
and redundant CPU modules.