Alarm Output Function - Mitsubishi MELSEC L Series User Manual

8.6

Alarm Output Function

This function outputs an alarm when the digital value is out of the preset range.
Warning output upper limit value
Warning output lower limit value
CH1 Warning output flag
(upper limit value) (Un\G48.b0)
CH1 Warning output flag
(lower limit value) (Un\G48.b1)
Warning output signal (XE)
Warning output clear request (YE)
(1) Alarm output notification
When the digital value moves above the alarm output upper limit value, or below the alarm output lower limit
value, alarm notifications are made by Warning output flag (Un\G48), Warning output signal (XE) and the ALM
LED turning ON.
In addition, alarm code 15
The alarm code that is stored is shown below:
(2) Operation of alarm output function
When the digital value moves above the alarm output upper limit value, or below the alarm output lower limit
value, alarm notifications are made, and the analog output value becomes any of the following.
• When the digital value exceeds the alarm output upper limit value: An analog value converted from the
digital value of alarm output upper limit value is output.
• When the digital value is less than the alarm output lower limit value: An analog value converted from the
digital value of alarm output lower limit value is output.
After an alarm has occurred, the analog output value returns to the normal value by changing the digital value to
a value within the setting range. However, Warning output flag (Un\G48) and Warning output signal (XE) are not
cleared. (ALM LED keeps ON.)
Digital value
20000
-2000
OFF ON
OFF
OFF ON
OFF
is stored in Latest error code (Un\G19).
15
Fixed
Warning channel number
1: Lower limit
0: Upper limit
CHAPTER 8 FUNCTIONS
Digital value
Analog output value
OFF
ON
OFF ON
ON OFF
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