Mitsubishi Electric NZ2FTGN User Manual page 540

Ex.
When Higher equal comparison value is set (when "Hysteresis" is 2 or more)
The comparison match is detected when Counter value is equal to or larger than Comparison value of Process data output.
Comparison value + Hysteresis
Comparison value - Hysteresis
Comparison value reached
(b3 in Process alarm data)
Reset status bits
(b6 in "Control word" of Process data output)
Comparison condition met (3)
(b9 in "Counter status" of Process data input)
Comparison bit active (3)
(b6 in "Counter status" of Process data input)
(1) The lower limit value is stored as Counter value because up counting is performed when Counter value is the upper limit value.
(2) The upper limit value is stored as Counter value because down counting is performed when Counter value is the lower limit value.
(3) Comparison condition met and Comparison bit active operate regardless of the parameter setting.
19 HIGH-SPEED COUNTER MODULE
538
19.1 NZ2FTS-D62P2
Counter value
Upper limit value
(+2147483647)
Alert
Comparison value
0
Lower limit value
(-2147483648)
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Alert output range
(b5 in Status word "Unacknowledged process alarm" is on.)
Out of alert output
(b5 in Status word "Unacknowledged process alarm" is off.)
Included
Alert clear request
(2) Alert
Alert cleared
(1)
Alert clear request
Alert cleared