Installation and Configuration
Ensemble HLe
2.5.2. Position Synchronized Output (PSO)/Laser Firing (J205)
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 opto-isolated output is available on the TB302 connector of the -IO option (see
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 2-26:
PSO Specifications
Specification
Value
Maximum Input Tracking Rate
(1)
Single-Axis Tracking
16.6 MHz
Dual-Axis Tracking
8.33 MHz
Triple-Axis Tracking
8.33 MHz
Maximum Quadrature Encoder Output
Frequency
Standard Feedback
40 MHz
-MXH Feedback
25 MHz
Maximum PSO Output (Fire) Frequency
(2)
12.5 MHz
Firing Latency(3)
Single-Axis Tracking
160 nsec
Dual-Axis Tracking
220 nsec
Triple-Axis Tracking
220 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.
3.
MXH encoder multiplier options have an additional latency of ~3.25 microseconds between the measurement position and the
update of the PSO hardware.
N O T E :
When using the MRK± signals with single-ended systems,
do not
connect MRK+ or MRK- to
GROUND (GND).
Software controlled PSO pre-scalars may be used to limit the data rate of each encoder being tracked
without affecting the servo loop data rate.
Table 2-27:
PSO Output Pins on the Auxiliary I/O Connector (J205)
Pin#
Description
In/Out/Bi
19
Auxiliary Marker- / PSO output
Bidirectional
20
Auxiliary / PSO output
Bidirectional
23
Analog Common
-
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Chapter 2
55
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