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XPS-Q8 Controller
23.0
Appendix E: PCO Connector
XPSDocumentation V1.4.x (EDH0301En1060 — 10/17)
Figure 70: Position Compare Output Connector.
There is one PCO connector for every two axes. Axis #1 refers to the upper (odd)
encoder plug and axis #2 refers to the lower (even) encoder plug. The signals provided
on this plug depend on the configuration of the output triggers, see chapter 13, Output
trigger, for more details.
The state of the enable signal is low when the stage is inside the programmed position
compare window.
Note also, that only the falling edge of the trigger pulse is precise and only this edge
should be used for synchronization regardless of the PCOPulseWidth setting.
The duration of the pulse is 200 nsec by default and can be modified using the function
PositionerPositionComparePulseParametersSet(). Possible values for the
PCOPulseWidth are: 0.2 (default), 1, 2.5 and 10 (µs). Successive trigger pulses should
have a minimum time lag equivalent to the PCOPulseWidth time times two.
The signals are open collector type and accept up to 30 Volts and 40 mA
The +5V output provided on the PCO connector can be used to pull-up these outputs
and can supply 50 mA max.
To ensure fast transitions with an open collector, it is necessary to have enough
current to speed-up the transistor's junction capacitor charge / discharge. A good
value is around 10 mA. So to pull-up the PCO signals to +5 V, a 470 Ω resistor can
be used.
Refer to section B.1 Digital I/Os, Digital Outputs for detailed electrical description.
212
NOTE
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