Advantech PCI-1240, Руководство пользователя

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25 Chapter 3
3.8 Encoder Input (nECAP, nECAN, nECBP, nECBN,
nINOP, nINON)
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-1240/PCI-1240U 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-1240/PCI-1240U use high speed
photo coupler 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 MCX314/MCX314AS is low. The maximum
possible A/B phase feedback frequency is about 1 MHz.