Mitsubishi Electric NZ2FTGN User Manual page 531

■Once - no main direction
This function performs counting between the lower limit value (-2147483648) and upper limit value (2147483647). The
counting stops when the value exceeds the upper limit value or goes below the lower limit value.
Ex.
When Once - no main direction is set (when "Counter behaviour internal gate" is set to "Interrupt counting")
Set SW gate
(b2 in "Control word" of Process data output)
Reset SW gate
(b10 in "Control word" of Process data output)
SW gate active
(b2 in "Counter status" of Process data input)
Internal gate active
(b5 in "Counter status" of Process data input)
Overflow performed
(b11 in "Counter status" of Process data input)
Underflow performed
(b12 in "Counter status" of Process data input)
(1) When the Set SW gate is turned on, the counting starts.
When the counting starts, SW gate active and Internal gate active turn on.
(2) The input pulse is switched from subtraction pulse to addition pulse.
(3) The input pulse is switched from subtraction pulse to addition pulse.
(4) If Counter value exceeds the upper limit value during up counting, the lower limit value is stored in Counter value.
At this time, the counting stops automatically, Internal gate active turns off, and Overflow performed turns on.
(5) When Reset SW gate is turned on, SW gate active turns off.
(6) When Set SW gate is turned on, the counting restarts.
After restarting the counting, SW gate active and Internal gate active turn on.
(7) The input pulse is switched from subtraction pulse to addition pulse.
(8) If Counter value goes below the lower limit value during down counting, the upper limit value is stored in Counter value.
At this time, the counting stops automatically, Internal gate active turns off, and Underflow performed turns on.
Underflow performed and Overflow performed are held until Reset status bits (b6 of Process data output
"Control word") is turned on.
Counter value
Upper limit value
(+2147483647)
(2)
(1)
0
(3)
Lower limit value
(-2147483648)
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
(8)
(7)
(6)
(4)
(5)
19 HIGH-SPEED COUNTER MODULE
19.1 NZ2FTS-D62P2
19
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