Siemens SIMATIC TI505 - Non-Quadrature Modes of Counting; Up;Down Counting Overview; Direction Counting Overview; Figure 1-8 Direction Counting

Product Overview
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High Speed Counter Encoder Module User Manual
1.4 Non-Quadrature Modes of Counting
When you select the up/down counting mode, two input pulse signals
determine the count value. (Refer to Figure 1-7.)
• W ith input B high, the count increments on the rising edge of input A.
• W ith input A high, the count decrements on the rising edge of input B.
For proper counting, the input without the clock must be held high or on;
otherwise, the count value that results cannot be defined.
A
5678Count V alue: 74
B
56
Up Count
Down Count
Up/Down Pulse Counting Mode
Figure 1-7 Up/Down Counting
When you select direction counting mode, the input B signal controls the
count values of the input A pulse. (Refer to Figure 1-8.)
• W ith input B low , the count increments on the rising edge of input A.
• W ith input B high, the count decrements on the rising edge of input A.
For proper counting, input A must be high during the transition of input B;
otherwise, the count value that results can not be defined.
A
4321Count V alue: 25
B
43
Up/Down Direction Counting Mode
Down Counting Up Counting
Figure 1-8 Direction Counting
Up/Down Counting
Overview
Dir ection Counting
Overview