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

3
ANALOG OUTPUT MODULE REPLACEMENT

3.8.2 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/disable the offset value for each channel.
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
combin
STOP status
ation
Switches the resolution mode according to the
application.
Resolution mode
The resolution can be selected from 1/4000 or 1/12000.
The resolution mode is batch-set for all channels.
Online module
Replaces a module without stopping the system.
replacement
3
- 55
Description
D/A conversion
Enable
enable/disable
CH Output
enable/disable Enable Disable Enable Disable
flag
Not
Analog output test Allowed
allowed
A68DAI Q68
(-S1) DAIN
-
Disable -
Not allowed
-
: Available, - : Not available
Precautions for replacement
On Q68DAIN, by disabling the D/A
conversion for the channels that
are not used, the conversion
speed can be shortened.
On Q68DAIN, the output enable/
disable is set with Y signal (CH
Output enable/disable flag).
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.
Replaceable modules during
online are the Process CPU and
the Redundant CPU.