Mitsubishi Electric MELSEC Q Series User Manual page 43

3 SPECIFICATIONS
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POINT
(1) Even if the sensor has been connected properly, the Q62DA-FG detects the
disconnection at its output monitor value is lower than 1mA or lower when either
of the following ranges is set to the module.
• 4 to 20mA (Extended mode) with the disconnection detection mode set to
"fixed",
• User range setting 1.
When the output monitor value is 1mA or lower, perform one among the
followings:
• Set the disconnection detection mode to either "arbitrarily" or "auto setting" or
• Set the disconnection detection function to "disconnection detection
disabled".
(2) In case of the "auto setting" is set to disconnection mode and the Q62DA-FG
analog value is anywhere between 0.5mA and 2mA (or digital values of -2625
and -1500 respectively), the formula to calculate the output monitor value at the
disconnection detection is as shown below:
The output monitor value at
the disconnection detection = Digital value + (
(3) When the disconnection detection function is activated, "1" is stored to the bit of
the corresponding channel in Disconnection detection operation flag (buffer
memory address 139: Un\G139).
In the case of the "auto setting", if digital values are set within the dead band, the
disconnection is not detected and "0" is stored to the bit of the corresponding
channel in Disconnection detection operation flag (buffer memory address 139:
Un\G139).
MELSEC-Q
-3000- digital value
)
2
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