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

3
ANALOG OUTPUT MODULE REPLACEMENT

3.9.2 Functional comparison

Item
D/A conversion enable/ Specifies whether to enable or disable the D/A
disable function conversion for each channel.
Specifies whether to output the D/A conversion value or
D/A output enable/ the offset value for each channel.
disable function The conversion speed stays constant regardless of
whether D/A output is enabled or disabled.
Obtains analog output synchronized with the
programmable controller CPU.
The analog output will be updated after Synchronous
output request (YD) is set to ON and the time specified
as "programmable controller CPU processing time +
Synchronous output 120µs" has elapsed.
function However, the analog output will be fixed to CH1, and
other channels (CH2 to CH8) cannot be used.
When the module is mounted on a remote I/O station,
the analog output will not be synchronized because of a
link scan delay if the synchronous output function is
specified.
Retains an analog value that was output when the
Analog output HOLD/
programmable controller CPU is in the STOP status or
CLEAR function
an error occurs.
Outputs the analog value converted from a digital value
when CH Output enable/disable flag is forcibly turned
on while the programmable controller CPU is in the
STOP status.
Analog output test while
the programmable
Setting
controller CPU is in the
combi
STOP status
nation
Analog output test
Switches the resolution mode according to the
application.
Resolution mode The resolution can be selected from 1/4000, 1/12000, or
1/16000.
The resolution mode is batch-set for all channels.
Online module
Replaces a module without stopping the system.
replacement
3
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Description
D/A conversion
Enable
enable/disable
CH Output
enable/disable Enable Disable Enable Disable
flag
Not
Allowed
allowed
A68DAV Q68DAVN
-
Disable
-
Not allowed
-
: Available, - : Not available
Precautions for replacement
On Q68DAVN, by disabling the
D/A conversion for the channels
that are not used, the conversion
speed can be shortened.
On Q68DAVN, the output enable/
disable is set with Y signal (CH
Output enable/disable flag).
1) On Q68DAVN, the setting of
HOLD/CLEAR is carried out
for each channel.
2) For the Q68DAVN, this
function is set with the
intelligent function module
switch setting.
3) Refer to ("Analog output
status combination list" in the
Digital-Analog Converter
Module User's Manual to
check the execution status of
output.
Replaceable modules during
online are the Process CPU and
the Redundant CPU.