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Mitsubishi Electric MELSEC iQ-F FX5 User Manual Page 155

Programmable controllers.
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Setting methods
The procedure to use the warning output function is described below.
1.
Disable the warning output setting (process alarm).
Name
Warning output setting (process alarm)
2.
Set the upper limit and lower limit values for the process alarm.
Four levels of values from the process alarm upper upper limit value to the process alarm lower lower limit value can be set for
each channel using the warning output function (process alarm).
Name
Process alarm upper upper limit value
Process alarm lower upper limit value
Process alarm upper lower limit value
Process alarm lower lower limit value
3.
Enable the warning output setting (process alarm).
Operation
The warning output flag (process alarm upper limit) or the warning output flag (process alarm lower limit) turns ON when the
digital operation value exceeds the process alarm upper upper limit value, or is below the process alarm lower lower limit
value, and the conditions to output a warning are satisfied.
This function executes for each averaging time and averaging count configured when time average and count average are
specified. This function executes every conversion cycle when other A/D conversion methods are specified (Sampling
processing and moving average).
The warning output flag (process alarm upper limit) or the warning output flag (process alarm lower limit) turns OFF after the
warning is output when the digital operation value is lower than the process alarm lower upper limit value, or is larger than the
process alarm upper lower limit value, and the conditions to output a warning are no longer satisfied.
However, the alarm code stored for the latest alarm code is not cleared.
To clear the alarm code stored in the latest alarm code, cycle the alarm clear request through OFF  ON  OFF after all
warning output flags (process alarm upper limit) and the warning output flags (process alarm lower limit) return to the OFF
status.
Precautions
When using the digital clipping function, the scaling function, and the shift function, the digital operation value resulting after
digital clipping, scaling, and adding the shift is detected for warning. Make sure to set the upper limits and lower limits for the
process alarms with regard to digital clipping, scaling, and shift additions.
Allowable setting range
0: Enabled
1: Disabled
Allowable setting range
-32768 to +32767
(upper upper limit  lower upper limit
 upper lower limit  lower lower
limit)
4 FX5U CPU MODULE BUILT-IN ANALOG
Default value
1: Disabled
Default value
0
4.3 Functions (Analog input)
4
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