Output Monitor Function - Mitsubishi Electric MELSEC Q Series User Manual

3 SPECIFICATIONS

3.2.3 Output monitor function

Programmable controller CPU
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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
address 38, 39 (Un\G38, Un\G39) as CH
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.
Write/automatic refresh
CH output monitor value
Read/automatic refresh
POINT
CH Output monitor value (buffer memory address 38, 39: Un\G38, Un\G39) 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
20ms
Output monitor value.
Q62DA-FG
Buffer memory
Digital value
CH digital value
Digital value
MELSEC-Q
D/A
conversion
Analog
value
Output
A/D
conversion
Digital input value
Output monitor value
Time
Load
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