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MELSEC-Q
3 SPECIFICATIONS
3.2.3 Analog output test during programmable controller CPU STOP
(1) During the programmable controller CPU STOP, an analog output test as shown
in Table 3.5 can be performed.
(2) The analog output test performs the following operations in GX Developer device
testing or GX configurator-DA selection testing described in Section 5.6.1.
(a) Set D/A conversion enable/disable (buffer memory address 0: Un\G0) of
the channel to be tested to enable.
(b) Turn Operating condition setting request (Y9) from off to on. (Refer to
Section 3.3.2)
(c) Check that Operating condition setting completed flag (X9) turns off, and
turn Operating condition setting request (Y9) from on to off.
(d) Enable (off on) Output enable/disable flag (Y1 to Y8) of the channel
where the test is to be conducted.
(e) Write a digital value corresponding to the desired analog output value in
CH Digital value (refer to Table 3.7 in Section 3.4.1) in the buffer memory.
This function is performed with the D/A converter module of function version B or
later.
Table 3.5 List of analog output test
Setting
combination
D/A conversion enable/disable
(Un\G0)
Enable Disable
CH Output enable/disable flag (Y1 to Y8) Enable Disable Enable disable
Analog output test Allowed Not allowed
Not allowed
1
1 Perform the analog output test after changing D/A conversion enable/disable (buffer
memory address 0: Un\G0) to enable.
POINT
When the digital value storage device has been set in the automatic refresh setting
of GX Configurator-DA, the buffer memory is overwritten since automatic refresh is
performed if the programmable controller CPU is during STOP.
In this case, write a digital value to the digital value storage device instead of the
buffer memory.
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