Mitsubishi Electric MELSEC-A/QnA Series - Functional Comparison

3 ANALOG OUTPUT MODULE REPLACEMENT
3 - 55
3.8.2 Functional comparison
: Available, - : Not available
Item Description
A68DAI
(-S1)
Q68
DAIN
Precautions for replacement
D/A conversion enable/
disable function
Specifies whether to enable or disable the D/A
conversion for each channel.
On Q68DAIN, 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 Q68DAIN, 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) On Q68DAIN, the setting of
HOLD/CLEAR is carried out for
each channel.
2) For the Q68DAIN, 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.
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 or 1/12000.
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
combin
ation
D/A conversion
enable/disable
Enable Disable
CH Output
enable/disable
flag
Enable Disable Enable Disable
Analog output test Allowed
Not
allowed
Not allowed