User`s manual

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MELSEC-Q
3 SPECIFICATIONS
3.2.4 Warning output function
(1) If the digital value written to the buffer memory is equal to or greater than the
warning output upper limit value is equal to or less than the warning output lower
limit value, the warning output flag (buffer memory address 48: Un\G48) and
warning output signal (XE) turn ON to give a warning.
The warning is output for the D/A conversion enabled channel only.
(2) At occurrence of the warning, the analog output value is converted from the digital
value at the warning output upper limit value or warning output lower limit value.
(3) The warning output flag (buffer memory address 48: Un\G48) and warning output
signal (XE) turn OFF when the operating condition setting request (Y9) or warning
output clear request (YE) turns ON.
(4) For the warning output function, the disconnection detection/warning output
setting (buffer memory address 47: Un\G47) allows enable/disable of the warning
output to be specified for each channel. To enable the warning output, write "0" to
the bit position corresponding to the channel number and turn ON the operating
condition setting request (Y9). The default is all-channel disable.
(5) Set the warning output upper and lower limit values to the buffer memory
addresses 86 to 89 (Un\G86 to Un\G89).
Warning output
upper limit value
-16384
OFF ON
Warning output signal (XE)
OFF
OFF ON
Warning output
lower limit value
16384
Digital input value
CH1 warning output flag upper limit value
(Buffer memory address 48.b1)
CH1 warning output flag lower limit value
(Buffer memory address 48.b2)
OFF
Digital input value
Analog output value
ON ON
ON OFF
OFF
OFF
Warning output clear request (YE)
POINT
(1) If the warning is output immediately after D/A conversion is enabled, make a
warning output clear request after writing the digital value that is less than the
warning output upper limit value and is greater than the warning output lower
limit value.
(2) During an analog output test, the warning output function is invalid.