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Publication 1763-RM001C-EN-P - October 2009
128
Using High-Speed Outputs
Pulse Train Output
Function
The MicroLogix 1100 1763-L16BBB controller supports two 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
•
Accelerate/decelerate intervals
•
Run interval
The PTO instruction, along with the HSC and PWM functions, are different
than most other controller instructions. Their operation is performed by
custom circuitry that runs in parallel with the main system processor. This
is necessary because of the high performance requirements of these
functions.
In this implementation, the user defines the total number of pulses to be
generated (which corresponds to distance traveled), and how many
pulses to use for each acceleration/deceleration period. The number of
pulses not used in the acceleration/deceleration period defines how many
pulses are generated during the run phase. In this implementation, the
accelerate/decelerate intervals are not required to be the same.
Independent values can be defined for these intervals. The ADI bit in the
PTO function file is used to enable this feature. See page 134.
Within the PTO function file, there are PTO element(s). An element can
be set to control either output 2 (O0:0/2 on 1763-L16BBB) or output 3
(O0:0/3 on 1763-L16BBB).
The interface to the PTO sub-system is accomplished by scanning a PTO
instruction in the main program file (file number 2) or by scanning a PTO
instruction in any of the subroutine files. A typical operating sequence of
a PTO instruction is as follows:
1.
The rung that a PTO instruction is on is solved true.
ATTENTION
Only MicroLogix 1100 Series B controller supports 40kHz
PTO and PWM with any version of RSLogix500.
However, special cares are required in handling some of
PTO and PWM function file elements in user programs.
Refer to
Appendix F How to Use 40kHz PTO/PWM of
MicroLogix 1100 Series B Controller
information.
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