Mitsubishi Electric MELSEC-Q series User Manual page 58

(g) Examples to use a rate alarm
The change rate of digital output values in a limited range can be monitored easily as follows:
1: To monitor that a rising rate of a digital output value is within the specified range
Ex.
Change rate of digital
output value (%)
2: To monitor a drop rate of a digital output value is within the specified range
Ex.
Change rate of digital
output value (%)
3: To monitor a change rate of a digital output value is within the specified range
Ex.
Change rate of digital
output value (%)
56
Rate alarm upper limit
+30%
+20%
Rate alarm lower limit
0
0
Rate alarm upper limit
-20%
-30%
Rate alarm lower limit
Rate alarm upper limit
+10%
0
-10%
Rate alarm lower limit
Time
Time
Time