Position Synchronized Output (Pso)/Laser Firing (Aux Enc Connector); Table 3-17: Pso Output Pin Assignment (Aux Enc); Table 3-18: Pso Output Sources - Aerotech Ensemble Epaq Hardware Manual

Table of Contents

Ensemble Epaq Hardware Manual

3.7.1. Position Synchronized Output (PSO)/Laser Firing (Aux Enc Connector)

The Ensemble Epaq includes a Position Synchronized Output (PSO) feature. The PSO output is available on

the dual function AUXMRK± differential signal lines (use of an RS-422 line receiver or opto-isolator is

recommended). The auxiliary marker must be configured as an output using the PSOOUTPUT CONTROL

command, see the Ensemble Help file for specific details.

The PSO can be programmed to generate an output synchronized to the encoder position, typically used to

fire a laser or sequence an external device. Trigger signals may be derived from the standard encoder

channel, auxiliary encoder channel, or a software trigger. The synchronized output pulse is generated using

high-speed hardware, allowing minimal latency (200 nanoseconds) between the trigger condition and the

output.

N O T E : When using the MRK± signals with single-ended systems, do not connect MRK+ or MRK- to

GROUND (GND).

The PSO can track an encoder with a maximum data (count) rate of 16.7 MHz (single axis tracking). Signals

in excess of this rate will cause a loss of PSO accuracy.

Multi-axis PSO can track encoder signals with a maximum data rate of 8.33 MHz. Signals in excess of this

rate will cause a loss of PSO accuracy. 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 3-17:

PSO Output Pin Assignment (Aux Enc)

Pin#

Description

Auxiliary RS-422 Marker Pulse - / PSO Output

Auxiliary RS-422 Marker Pulse +/ PSO Output

Encoder Power Common

(1) For PSO, see

Section 3.7.1.

Table 3-18:

PSO Output Sources

PSO Output Type

(1)

RS-422 Marker

(1) software configurable as the PSO output or Marker input Refer to the Ensemble Help File for programming information.

(1)

Max Frequency