User`s manual

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MELSEC-Q
3 SPECIFICATIONS
3.3.2 Details of I/O signals
I/O signals for the Q62DA-FG 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 Q62DA-FG has a watchdog timer error
X8 Monitor start flag
(1) This flag turns ON at completion of the A/D conversion of the output analog value,
and the output monitor value is stored.
(2) The monitor start flag turns OFF when the operating condition setting request (Y9)
turns ON.
X9
Operating
condition setting
completed flag
(1) This is used as an interlock condition for turning ON/OFF the operating condition
setting request (Y9) when any of the following settings is changed.
• D/A conversion enable/disable setting (buffer memory address 0: Un\G0)
• Rate control enable/disable setting (buffer memory address 46: Un\G46)
• Disconnection detection/warning output setting (buffer memory address 47:
Un\G47)
• Increase/decrease digital limit value (buffer memory addresses 70 to 73: Un\G70
to 73)
(2) Under the following conditions, the operating condition setting completed flag (X9)
turns OFF.
• When operating condition setting request (Y9) is ON
Performed by the Q62DA-FG
Performed by the sequence program
Module ready (X0)
Operating condition
setting completed flag (X9)
Operating condition
setting request (Y9)