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MELSEC-Q
1 OVERVIEW
1
1 OVERVIEW
This User's Manual describes the specifications, handling and programming methods
for the Q62DA type digital-analog conversion module (hereinafter referred to as the
Q62DA), the Q64DA type digital-analog conversion module (hereinafter referred to
as the Q64DA), the Q68DAV type digital-analog conversion module (hereinafter
referred to as the Q68DAV) and the Q68DAI type digital-analog conversion module
(hereinafter referred to as the Q68DAI) which are used in conjunction with MELSEC-
Q series CPU module (hereinafter referred to as the PLC CPU).
In this manual, the Q62DA, Q64DA, Q68DAV and Q68DAI are collectively referred to
as the D/A (Digital-Analog) conversion modules.
1.1 Features
(1) Available models
• Q62DA ........ 2 channels: Voltage or current output can be selected for each
channel.
• Q64DA
........ 4 channels: Voltage or current output can be selected for each
channel.
• Q68DAV........8 channels: All of which are voltage output.
• Q68DAI ........8 channels: All of which are current output.
(2) High-speed conversion processing
Conversion processing is performed at a speed of 80 s/channel.
(3) High degree of accuracy
The conversion accuracy is ± 0.1% (When the ambient temperature is 25 ± 5 °C).
(4) Changing the resolution mode
The resolution mode can be changed according to the application, and digital-
value resolution settings of 1/4000, 1/12000 or 1/16000 can be selected.
(5) Changing the output range
The output range 1 can easily be changed using GX Developer.
1 The output range refers to the type of offset/gain settings. The most
frequently used range is set as the default but the user can also specify their
own offset/gain settings.
(6) Synchronous output function
This function sets a constant time (120 s) until the analog value is output after
the digital value is written from the PLC CPU. Highly accurate analog control can
be achieved by combining this function with a constant cycle execution type
program for the PLC CPU or the constant scan function 2.
2 The constant scan function executes the sequence program within a fixed
time interval.
(7) Analog output HOLD/CLEAR function
This function is set to either retain or clear the analog output value when the CPU
module is in the STOP status or when a stop error occurs.
