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MELSEC-Q
5 DETAILS AND SETTING OF FUNCTIONS
Outline of comparison output function operation
The following gives the outline of the comparison output function operation. (For
CH1)
Comparison signal reset request
(Y10)
Accumulating counter comparison flag
(X10)
Comparison output setting value
(Buffer memory address:2,3)
Operating condition setting
complete flag
(X1)
OFF
ON
1)
1200
OFF
ON
1)
Count indication start
0
788
0+788
788
1100 1388
1100+288>1200
288
OFF
2)
ON
ON
OFF
Count enable
(Y18)
Sampling pulse number
(Buffer memory address:0)
Accumulating count value
(Buffer memory address:8,9)
Number Details
1)
Count operation is started when the count enable (Y18) is turned ON with
the operating condition setting complete flag (X1) ON.
2)
When the "accumulating count value" is equal to or greater than the
"comparison output setting value", the accumulating counter comparison
flag (X10) turns ON.
Since the accumulating count value is updated at intervals of the count
cycle setting value (refer to Section 5.1.2), the accumulating counter
comparison flag is also turned ON at the timing of the count cycle setting
value.
POINT
The accumulating counter comparison flag (X10 to X17) is reset when the
comparison signal reset request (Y10 to Y17) is turned ON. When the accumulating
counter is operating as a linear counter, the accumulating counter comparison flag
(X10 to X17) that was turned OFF once does not turn ON until the accumulating
count value reaches the comparison output setting value again after it has been
reset.
If the accumulating counter is operating as a ring counter, the flag turns ON when
the accumulating count value reaches the comparison output setting value again in
the ring processing.
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