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MELSEC-Q
6 CONVENIENT USAGE
6.4 Using the Sampling Counter Function
This function counts the pulses input in the specified sampling time (T).
The relationships between the signals, buffer memory, etc. in the sampling counter
function are illustrated below.
ON
OFF
ON
OFF
TTT
200
100
0
200
100
0
-100
1
0
1)
2)
3)
4)
5)
CH Count enable command
(Y4, YC)
CH Present value
(Un\G2, Un\G3, Un\G34, Un\G35)
CH Counter function selection start
command (Y6, YE)
Counter function selection start command
(function start input)
CH Sampling count value
(Un\G14, Un\G15, Un\G46, Un\G47)
CH Sampling/periodic counter flag
(Un\G11, Un\G43)
Number Description
1)
Input pulses are counted from 0 on the rising edge of CH
Counter function
selection start command (Y6, YE) or the counter function selection start
command (function start input).
2) When the specified sampling time period elapses, the count stops.
3)
While the sampling counter function is performed, "1" is stored in CH
Sampling/periodic counter flag (Un\G11, Un\G43).
4)
Even after the sampling counter function is performed, the value stored in CH
Sampling count value (Un\G14, Un\G15, Un\G46, Un\G47) is held.
5)
The sampling counter function is performed regardless the on/off status of CH
Count enable command (Y4, YC).