Chapter 5 Program Configuration and Operation Method
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5.1.6 Counter processing
The counter counts the rising edges of pulses driving its input signal and counts once only when the input
signal is switched from off to on. XGB series have 4 counter instructions such as CTU, CTD, CTUD, and
CTR. The followings shows brief information for counter operation. Refer to the „XGB Instruction Manual‟ for
details.
Up counter increases the current value.
Down counter decreases the current value.
Up/Down counter compares the input value from both counters input.
Ring counter increase the current value and the current value is cleared as 0 when the current value
reaches the preset value.
(1) Renewal of counter‟s current value and contact On/Off
(a) Up counter
Up counter increases the current value at the rising edges of input.
The counter output contact (Cxxx) is turned On when the current value reaches the preset value.
When the reset input is turned On, the counter output contact (Cxxx) is turned Off.
(b) Down counter
Down counter decreases the current value at the rising edges of input.
The counter output contact (Cxxx) is turned On when the current value reaches the preset value.
When the reset input is turned On, the counter output contact (Cxxx) is turned Off.
(c) Up/Down counter
The current value is increased with the rising edge of up-count input signal, and decreased with the
rising edge of down-count input signal. The counter output contact (Cxxx) is turned On when the
current value is same as or more than current value. The counter output contact (Cxxx) is turned Off
when the current value is same as or less than current value.
When the reset input is turned On, the current value is cleared as 0.
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