NSD ABSOCODER NPG-220HZCLC Specifications & Instruction Manual page 37

●A/B phase pulse
If the sensor travel direction setting is OFF (up pulse), A phase will be faster than B phase
when the sensor travels to the sensor data increase direction which is indicated in the outer
dimension.
A phase pulse
B phase pulse
If the sensor travel direction setting is ON (down pulse), A phase will be slower than B phase
when the sensor travels to the sensor data increase direction which is indicated in the outer
dimension.
A phase pulse
B phase pulse
The Busy signal doesn't change when outputting A/B phase pulse.
Ts: depends on the speed (1m/s: approx. 1μs)
● Pulse missing
If the ABSOCODER sensor travel exceeds the pulse output permissive speed, pulses will not be output.
The pulses which aren't output during that time can be stored. Even though the pulse output error (PE) is
output, stored pulses are output when the ABSOCODER sensor travel speed is back to the range of the
pulse output permissive speed. Hence, the pulse missing will be never occurred.
However, there is a time lag between actual ABSOCODER sensor position and pulse output because of
stored pulses.
In this case, the pulse output error (PE) occurs only, the integrated alarm (ALM) doesn't.
This motion is corresponding to both up/down pulse and A/B phase pulses.
T=Ts×4
PU+
PU-
Ts
PD+
PD-
T=Ts×4
PU+
PU-
Ts
PD+
PD-
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