Counter Function7-87.1.4 Selection of Count Methods• Select from the following three types according to input devices to be connected.• In the case of phase input, the count operation varies depending on the settings ofmultiplication factor as shown on the next page. Count methodMethod Connection CountDirectiondistinctionInput AInput BIncremental encoderorPulse generator Pulse inputCount directionSensororSwitchUnit For the direction distinction input, thecount signal is connected to the inputA signal. The count direction iscontrolled by the level of the directionsignal of the input B signal.When the input B signal is off, thecounter is incremented when theinput A signal rises or falls. When theinput B signal is on, the counter isdecremented.IndividualUnitInput AInput BIncremental encoderorPulse generator Addition pulse inputSubtraction pulse inputIncremental encoderorPulse generatorIn the individual input method, thecounter is incremented when theinput A signal rises or falls, anddecremented when the input B signalrises or falls.PhaseUnitInput AInput ZInput BIncrementalencoderPhase A pulse inputPhase B pulse inputPhase Z input(Reset input)For the phase input, the input Asignal and input B signal of eachcounter are connected to the phase Aand phase B of an encoder.The count direction depends on thephase difference between the phasesA and B. When the phase A isproceeding by 90 degrees inelectrical angle than the phase B, thecount value is incremented. When thephase A is delayed by 90 degrees inelectrical angle than the phase B, thecount value is decremented.
