Eaton XN300 - 35.4 How the counter module works

35 Counter module XN-322-1CNT-8DIO
35.4 How the counter module works
289 XN300 slice modules 02/24 MN050002EN Eaton.com
35.4 How the counter module works
In AB quadrature mode, the phase shift of the input signals at pins A and B is
used to determine pulses and directions. To do this, signals A and B are
evaluated for rising and falling edges. The device can be configured for X1,
X2, or X4 encoding as necessary.
The dots represent the points at which the count changes. If the signal
sequence is followed in the direction the arrow is pointing (towards the
right), this corresponds to a positive counting direction. If it is followed
against it, this corresponds to a negative counting direction.
Please refer to Application examples  Chapter 39 “Appendix”, page 330.
a X1 encoding
b X2 encoding
c X4 encoding
Figure 161: Signal diagram for counter module
n = n - 1
A
B
n = n + 1
①
②
③