Advantech PCI-1220U, Руководство пользователя, Страница: 29 / 56

23 Chapter 3
3.8 Encoder Input
When feedback the encoder signals, connect nECAP to phase A of
encoder output. And nECAN to phase A, nECBP to phase B, nECBN to
phase B. nIN0P to phase Z and nIN0N to phase Z. The default setting of
position feedback of PCI-1220U is quadrature input. Up/Down pulses
feedback is available after setting the input pule mode.
nIN0P/N is used for encoder phase Z signal feedback and also can be
used as general purposed input or instantaneous stop input.
Figure 3.11: Circuit Diagram of Encoder Feedback
From the circuit diagram above, PCI-1220U uses high speed photo cou-
pler for isolation. The encoder output can be differential mode or open-
collector mode. When n***P is high and n***N is low, the real feedback
signal (n***) to MCX312 is low. The maximum possible A/B phase feed-
back frequency is about 1 MHz.