User`s manual

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MELSEC-Q
3 SPECIFICATIONS
3.2 D/A Converter Module Function
Table 3.3 shows the function of the D/A converter modules.
Table 3.3 Function list
Item Function Reference section
D/A conversion enable/disable
function
(1) Specifies whether to enable or disable the D/A conversion for each channel.
(2) By disabling the D/A conversion for the channels that are not used, the conversion speed can be
shortened.
Section 3.4.4
D/A output enable/disable
function
(1) Specifies whether to output the D/A converted value or the offset value for each channel.
(2) The conversion speed stays constant regardless of whether D/A output is enabled or disabled.
Section 3.3.1
Synchronous output function (1) An analog output synchronized with the PLC CPU can be obtained. Section 3.2.1
Analog output HOLD/CLEAR
function
(1) The output analog value can be retained when the PLC CPU module is placed in the STOP
status or when an error occurs.
Section 3.2.2
Analog output test during PLC
CPU STOP
(1) When the CH output enable/disable flag is forced ON during PLC CPU STOP, the D/A
converted analog value is output.
Section 3.2.3
Resolution mode
(1) The resolution mode can be changed according to the application, and a resolution setting can
be selected from 1/4000, 1/12000 and 1/16000.
(2) The resolution mode setting is applicable to all channels.
(3) See Section 3.1.1 for the digital input values and maximum resolution in normal resolution mode
and high resolution mode.
Section 3.1.1
Section 4.5
Online module change (1) A module change is made without the system being stopped. Chapter 7
3.2.1 Synchronous output function
An analog output that is synchronized with the PLC CPU can be obtained.
The analog output will be updated after the synchronous output request (YD) is set to ON
and the time specified as "PLC CPU processing time + 120
s" 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.
Digital write from the
PLC CPU
Synchronous output
request (YD)
Analog output value
Always constant
<Program example>
Write command
DELTA YD
T0 K1 D0 K1H0
Digital value write
Outputs synchronous
output request as a pulse