Yaskawa MP900 Series Ladder Programming Manual - Manual (Page 294)

5.10 System Function Instructions
5.10.1 Counter (COUNTER)
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Instructions
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5.10 System Function Instructions
5.10.1 Counter (COUNTER)
( 1 ) Operation
When the count up or count down command changes from OFF to ON, the current value is incremented or decre-
mented.
When the counter reset command turns ON, the current value of the counter is set to 0. The current value of the counter
is compared against the set value and the result is output.
If a counter error occurs (i.e., if the current value is greater than the set value), the current value will neither be incre-
mented nor decremented.
Three status are output as shown below.
• Count matched (current value = set value).
• Count is zero (current value = 0).
• Counter error
(current value > set value or current value < 0).
Status
Rising edge of count up command
(OFF → ON)
Rising edge of count down command
(OFF → ON)
Counter reset command
ON
Count value incremented
(current value + 1).
Count value decremented
(current value − 1).
Counter reset
(current value = 0)
Counter set value
Counter current value
COUNTER instruction