139 Publication 1766-RM001A-EN-P - October 2008
Chapter
6
Using High-Speed Outputs
The high-speed output instructions allow you to control and monitor the
PTO and PWM functions which control the physical high-speed outputs.
PTO - Pulse Train Output
Instruction Type: output
Pulse Train Output
Function
The MicroLogix 1400 1766-L32BXB and 1766-L32BXBA controller supports
three high-speed outputs. These outputs can be used as standard outputs
(not high-speed) or individually configured for PTO or PWM operation.
The PTO functionality allows a simple motion profile or pulse profile to
be generated directly from the controller. The pulse profile has three
primary components:
• Total number of pulses to be generated
Instruction Used To: Page
PTO - Pulse Train Output Generate stepper pulses 139
PWM - Pulse Width Modulation Generate PWM output 159
PTO
Pulse Train Output
PTO Number 0
PTO
IMPORTANT
The PTO function can only be used with the controller’s embedded I/O. It
cannot be used with expansion I/O modules.
IMPORTANT
The PTO instruction should only be used with MicroLogix 1400 BXB or BXBA
units. Relay outputs are not capable of performing very high-speed
operations.
Execution Time for the PTO Instruction
Controller When Rung Is:
True False
MicroLogix 1400 11.0210 µs 5.5115 µs
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