Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 361

■Detection target for outputting an alert
'CH1 Digital output value' (Un\G400) is a target for outputting an alert. The target is the same for when the scaling function is
enabled.
■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
Change rate of the digital output value (%)
+30%
+20%
0
• Example 2
To monitor that a drop rate of a digital output value is within the specified range
Change rate of the digital output value (%)
0
-20%
-30%
• Example 3
To monitor that a change rate of a digital output value is within the specified range
Change rate of the digital output value (%)
+10%
0
-10%
■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.
Rate alarm upper value
Rate alarm lower value
Time (t)
Rate alarm upper value
Time (t)
Rate alarm lower value
Rate alarm upper value
Rate alarm lower value
Time (t)
3
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3.4 Functions