4 FUNCTIONS
4.7 Alert Output Function
41
4
Application examples of rate alarms
A rate alarm serves to monitor that the variation of a digital output value lies in a limited range as shown below:
■
Example 1
To monitor that a rising rate of a digital output value is within the specified range
■
Example 2
To monitor that a drop rate of a digital output value is within the specified range
■
Example 3
To monitor that a change rate of a digital output value is within the specified range
Operation performed when disconnection is detected
• At disconnection detection, a rate alarm may occur as well because 'CH1 Digital output value' (Un\G400) changes
according to 'CH1 Conversion setting at disconnection detection' (Un\G531).
• At recovery time from disconnection, previous information (value) of rate alarm is cleared. Therefore, at the restart of
conversion, even if the change rate of the digital output value (from before restart to after restart) is out of the limit range, an
alert is not output.
+30%
+20%
0
Time (t)
Change rate of the digital output value (%)
Rate alarm upper value
Rate alarm lower value
-20%
-30%
0
Time (t)
Change rate of the digital output value (%)
Rate alarm upper value
Rate alarm lower value
+10%
-10%
0
Time (t)
Change rate of the digital output value (%)
Rate alarm upper value
Rate alarm lower value
Содержание MELSEC iQ-F
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