Functional Comparison - Mitsubishi Electric MELSEC L Series Manual

3
ANALOG OUTPUT MODULE REPLACEMENT

3.4.2 Functional comparison

Item
D/A conversion enable/
Sets whether to enable or disable D/A conversion for each channel.
disable function
Sets whether to output the D/A conversion value or the offset value
D/A output enable/disable for each channel.
function The conversion speed is constant, regardless of the output enable/
disable status.
Range switching function Sets the output range to be used.
Offset/gain setting function Corrects errors in analog output values.
Analog output HOLD/ Sets the status of analog output values (HOLD or CLEAR), according
CLEAR function to the CPU module operating status (RUN, STOP, or stop error).
Outputs the converted analog values when CH Output enable/
disable flag is forcibly turned on while the CPU module is in the STOP
status.
Analog output test when
Setting
CPU module is in STOP
combi-
status
nation
Resolution mode
Sets the resolution according to the application.
Scale-converts the input digital value to the set range of the scaling
Scaling function upper limit value and scaling lower limit value. This omits the
programming of the scale conversion.
Alarm output function Outputs an alarm when the digital value is out of the preset range.
Turns on when the external power supply (24VDC) is supplied. When
External power supply
this flag is off, the analog output value becomes 0V/0mA regardless
READY flag
of other settings.
Stores the errors and alarms occurred in the D/A converter module to
Error log function the buffer memory as a history. Up to 16 errors and alarms can be
stored.
Module error collection Collects the errors and alarms occurred in the D/A converter module
function and stores them in the CPU module.
Clears the error from the system monitor window of the programming
Error clear function
tool.
Saving and restoring offset/
Saves and restores the offset/gain values in the user setting range.
gain values
*1 For the A1S68DAV, the mode is fixed at 1/4000 (-2000 to 2000).
For the L60DA4, the resolution is 1/20000 (fixed). To use the same digital value that is used for the A1S68DAV, set the
scaling upper and lower limit values that match the resolution of the A1S68DAV using the scaling function.
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Description
D/A conversion
Enable
enable/disable
CH Output enable/
Enable Disable Enable Disable
disable flag
Analog output test Allowed
allowed
A1S68DAV L60DA4
–
–
Disable
–
Not
Not allowed
*1
–
–
–
–
–
–
–
–
: Available, –: Not available
Precautions for replacement
With the L60DA4, disabling the D/A
conversion for an unused channel
reduces the conversion cycles.
The A1S68DAV is set the status for
all channels at once using the HLD/
CLR terminal on the front of the
module.
With L60DA4, HOLD/CLEAR is set
for each channel.
Since the resolution differs
between AnS series and L series
modules, it needs to be matched
–
using a sequence program, user
range settings, or the scaling
function. (Refer to Appendix 3.)
By setting the same scaling upper
limits and scaling lower limits as the
resolution of A1S68DAV, the same
digital output values as A1S68DAV
can be used.
This function can be used on the
GX Works2.