Installation and Configuration
Ensemble CP
2.5.2. Position Synchronized Output (PSO)/Laser Firing (J104)
The PSO can be programmed to generate an output synchronized to the feedback position and is typically
used to fire a laser or sequence an external device. Trigger signals may be derived from a feedback channel
or a software trigger. The position synchronized output pulse is generated using high-speed hardware,
allowing minimal latency between the trigger condition and the output.
The PSO output is available on the dual-function AUX Marker/PSO signal lines. The auxiliary marker must
be configured as an output using the PSOOUTPUT CONTROL command. Refer to the Help File for more
information.
An RS-422 line receiver or opto-isolator is recommended, especially when using long cable lengths in noisy
environments or when high frequency pulse transmission is required. It is best to locate the line receiver or
opto-isolator close to the receiving electronics.
Table 2-28:
PSO Specifications
Specification
Value
Maximum Input Tracking Rate
(1)
Single-Axis Tracking
16.6 MHz
Maximum Quadrature Encoder Output
Frequency
Standard Feedback
40 MHz
Maximum PSO Output (Fire) Frequency
(2)
12.5 MHz
Firing Latency
Single-Axis Tracking
160 nsec
1.
Signals in excess of this rate will cause a loss of PSO accuracy.
2.
The optocoupler that you use on the output might have an effect on this rate.
N O T E :
When using the MRK± signals with single-ended systems,
do not
connect MRK+ or MRK- to
GROUND (GND).
N O T E :
The PSO feature is
not
compatible with the -MXU option. The PSO feature operates with the -
MXH option and with square wave encoders.
Table 2-29:
PSO Output Pin Assignment (J104)
Pin#
Description
In/Out/Bi
19
Auxiliary Marker- / PSO output
Bidirectional
20
Auxiliary / PSO output
Bidirectional
23
Analog Common
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