Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 40

Rate alarm
This function outputs a warning when the change rate of a digital output value is equal to or more than the rate alarm upper
limit value, or the rate is equal to or less than the rate alarm lower limit value.
CH1 Warning output flag (rate alarm upper)
CH1 Warning output flag (rate alarm lower)
CH2 Warning output flag (rate alarm upper)
CH1 A/D conversion latest alarm code
CH2 A/D conversion latest alarm code
■Operation
The digital output value is monitored in each rate alarm warning detection period. When the change from the previous value
shows the change rate above the rate alarm upper limit value or below the rate alarm lower limit value, the "warning output
flag (rate alarm upper limit)" or "warning output flag (rate alarm lower limit)" turns ON.
When the digital output value changes to a value below the rate alarm upper limit value or above the rate alarm lower limit
value and the warning output condition is not satisfied after the warning output, the "warning output flag (rate alarm upper
limit)" or "warning output flag (rate alarm lower limit)" turns OFF. The "warning output flag (rate alarm upper limit)" and
"warning output flag (rate alarm lower limit)" turn OFF also when the "warning output setting (rate alarm)" is set to "disable".
However, the alarm code stored in the "A/D conversion latest alarm code" is not cleared.
For clearing the alarm code stored in the latest alarm code, wait until the "warning output flag (rate alarm upper limit)" and
"warning output flag (rate alarm lower limit)" turn OFF, and then set the "alarm clear request" to OFF, ON and OFF.
■Detection cycle
Set the rate alarm warning detection period in "rate alarm warning detection period setting".
2 FX5-4AD-ADP
38
2.3 Functions
Digital output value
Rate alarm
detection period
Change rate of the digital output value (%)
Rate alarm upper limit value
0
Rate alarm lower limit value
0000H
CH1 Digital
output value
warning
CH2 Digital
output value
Change rate of CH1
Digital output value
Change rate of CH2
Digital output value
0821H
0000H
Controlled by the FX5-4AD-ADP
Time
Time
0831H
0822H