User`s manual

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MELSEC-Q
3 SPECIFICATIONS
3.2.3 Output monitor function
To check the actually output analog value, the analog output value is converted into a
digital value within the Q62DA-FG and the result is stored at the buffer memory
addresses 38,39 (Un\G38, Un\G39) as an output monitor value.
The monitor start flag (X8) is turned ON when the A/D conversion of the analog output
value is completed.
A/D conversion is performed on the D/A conversion-enabled channel to update the
output monitor value.
Digital value
Write/automatic refresh
Read/automatic refresh
Load
Analog
value Output
Buffer memory
PLC CPU
Q62DA-FG
D/A
conversion
Digital value
CH digital value
CH output monitor value
A/D
conversion
POINT
The output monitor value is stored into the buffer memory a maximum of two
conversion cycles (20ms) after the digital input value has been written.
Hence, the digital input value and output monitor value compared immediately after
write will not be the same.
Output
Time
20ms
Digital output value
Output monitor value