Publication 1763-RM001C-EN-P - October 2009
Using High-Speed Outputs 149
PWM - Pulse Width
Modulation
Instruction Type: output
5 No No Yes Jog Error PTO is in the idle state and two or more of the following are set:
•Enable (EN) bit set
•Jog Pulse (JP) bit set
•Jog Continuous (JC) bit set
This error does not fault the controller. It is automatically cleared when the
error condition is removed.
6 No Yes No Jog
Frequency
Error
The jog frequency (JF) value is less than 0 or greater than 20,000. This error
faults the controller. It can be cleared by logic within the User Fault Routine.
7 No Yes No Length
Error
The total output pulses to be generated (TOP) is less than zero. This error
faults the controller. It can be cleared by logic within the User Fault Routine.
Pulse Train Output Error Codes
Error
Code
Non-User
Fault
Recoverable
Fault
Instruction
Errors
Error
Name
Description
PWM
Pulse Width Modulation
PWM Number 1
PWM
IMPORTANT
The PWM function can only be used with the controller’s
embedded I/O. It cannot be used with expansion I/O
modules.
IMPORTANT
The PWM instruction should only be used with
MicroLogix 1100 BBB unit. Relay outputs are not capable
of performing very high-speed operations.
ATTENTION
MicroLogix 1100 Series A controller does not support
40kHz PTO and PWM. Only MicroLogix 1100 Series B
controller supports 40kHz PTO and PWM with any
version of RSLogix500. Refer to Appendix F How to Use
40kHz PTO/PWM of MicroLogix 1100 Series B Controller
for more information.
Execution Time for the PWM Instruction
Controller When Rung Is:
True False
MicroLogix 1100 51.9 μs 33.68 μs
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