Position Synchronized Output (PSO)

Program the Position Synchronized Output (PSO) to generate an output that is synchronized to the feedback position of an axis. PSO is typically used to fire a laser or trigger an external hardware device. The GL4 supports three-axis PSO in Automation1 versions 2.4.0+. The GL4 supports dual-axis PSO in A3200 and Automation1 versions before 2.4.0.

A PSO firing event can be triggered from a feedback channel or from a software trigger. You can get quadrature signals from feedback channels and PSO firing event signals after a PSO firing event occurs. When the PSO generates pulses, minimum latency occurs between the trigger condition and the output.

Aerotech recommends that you use an RS-422 line receiver or an opto-isolator if your system:

• Uses cables with long lengths in work areas where a lot of electrical noise occurs.
• Uses high-frequency pulse transmission.

For best performance, put the RS-422 line receiver or the opto-isolator near the electronics that receive the PSO output pulse.

Table: PSO Pins on the Laser Output A Connector

Pin #	Label	Description	In/Out/Bi
1	O1+	Laser Output 1+ / PSO Output	Output
2	O1-	Laser Output 1- / PSO Output	Output

Table: PSO Pins on the Laser Output B Connector

Pin #	Label	Description	In/Out/Bi
1	O1	Laser Output 1 / PSO Output (5V TTL)	Output
2	GND	Ground	N/A

Table: PSO Specifications