Mitsubishi Electric MELSEC-A/QnA Series - Functional Comparison

3 ANALOG OUTPUT MODULE REPLACEMENT
3 - 15
3.3.2 Functional comparison
: With functions, -: Without functions
Item Description A616DAV Q68DAVN Precautions for replacement
D/A conversion
enable/disable
function
Specifies whether to enable or disable the D/A conversion
for each channel. By disabling the D/A conversion for the
channels that are not used, the conversion speed can be
shortened.
D/A output enable/
disable function
Specifies whether to output the D/A conversion value or the
offset value for each channel.
The conversion speed stays constant regardless of
whether D/A output is enabled or disabled.
On Q68DAVN, the output
enable/disable is set with Y
signal (CH Output enable/
disable flag).
Synchronous output
function
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 + 120µs"
has elapsed.
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.
-
Analog output HOLD/
CLEAR function
Retains an analog value that was output when the
programmable controller CPU is in the STOP status or an
error occurs.
1) Refer to ("Analog output
status combination list" in
the Digital-Analog
Converter Module User's
Manual to check the
execution status of output.
2) For the Q68DAVN, this
function is set with the
intelligent function module
switch setting.
Analog output test
while the
programmable
controller CPU is in the
STOP status
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.
-
Resolution mode
Switches the resolution mode according to the application.
The resolution can be selected from 1/4000, 1/12000, or 1/
16000.
The resolution mode is batch-set for all channels.
-
Online module
replacement
Replaces a module without stopping the system. -
Replaceable modules during
online are the Process CPU
and the Redundant CPU.
Setting
combi
nation
D/A conversion
enable/disable
Enable Disable
CH Output
enable/disable flag
Enable Disable Enable Disable
Analog output test Allowed
Not
allowed
Not allowed