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MELSEC-Q
3 SPECIFICATIONS
3.3.2 Details of I/O signals
I/O signals for the D/A conversion module are explained in detail below.
(1) Input signals
Device No.
Signal name
Description
X0
Module READY
(1) When the PLC CPU is powered on or reset, this signal turns on once the
preparation for D/A conversion has been completed, and D/A conversion
processing is then performed.
(2) When the Module READY (X0) signal is off, D/A conversion processing is not
performed. Module READY (X0) turns off in the following situations:
• During offset/gain setting mode
• When the D/A conversion module has a watchdog timer error
X8
High resolution
mode status flag
(1) This turns ON when in high resolution mode.
X9
Operating
condition setting
completed flag
(1) This is used as an interlock condition for turning the operating condition setting
request (Y9) ON/OFF when the setting for D/A conversion enable/disable (buffer
memory address 0: Un\G0) is changed.
(2) Under the following conditions, the operating condition setting completed flag (X9)
turns OFF.
• When Module READY (X0) is OFF
• When operating condition setting request (Y9) is ON
Performed by the D/A conversion module
Performed by the sequence program
Module READY (X0)
Operating condition
setting completed flag (X9)
Operating condition
setting request (Y9)
XA
Offset/gain setting
mode flag
(1) This is used as an interlock condition for setting the user range write request (YA) to
ON/OFF when registering the value after adjustment of the offset/gain settings have
been completed.
(2) See Section 4.6 regarding the offset/gain settings.
Performed by the D/A conversion module
Performed by the sequence program
OFF
Module READY (X0)
Offset/gain setting mode flag (XA)
User range write request (YA)
