Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
158 Using High-Speed Outputs
PWM Accel/Decel Delay (ADD)
PWM ADD (Accel/Decel Delay) defines the amount of time in 10
millisecond interval to ramp from zero to 20kHz frequency. Also specifies
the time to ramp down to zero.
The PWM ADD value is loaded and activated immediately (whenever the
PWM instruction is scanned on a true rung of logic). This allows multiple
steps or stages of acceleration or deceleration to occur.
PWM Error Code (ER)
PWM ER (Error Codes) detected by the PWM sub-system are displayed in
this register. The table identifies known errors.
Element Description Address Data Format Range Type User Program
Access
ADD - Accel/Decel Delay PWM:0.ADD word (INT) 0 to 32,767 control read/write
Element Description Address Data Format Range Type User Program
Access
ER - PWM Error Codes PWM:0.ER word (INT) -2 to 5 status read only
Error
Code
Non-User
Fault
Recoverable
Fault
Instruction
Errors
Error
Name
Description
-2 Yes No No Overlap
Error
An output overlap is detected. Multiple functions are assigned to the same
physical output. This is a configuration error. The controller faults and the
User Fault Routine does not execute. Example: PWM0 and PWM1 are both
attempting to use a single output.
-1 Yes No No Output
Error
An invalid output has been specified. Output 2 and output 3 are the only valid
choices. This is a configuration error. The controller faults and the User Fault
Routine does not execute.
0 Normal Normal (0 = no error present)
1 No No Yes Hardstop
Error
This error is generated whenever a hardstop is detected. This error does not
fault the controller. It is automatically cleared when the hardstop condition is
removed.
2 No No Yes Output
Forced
Error
The configured PWM output (2 or 3) is currently forced. The forced condition
must be removed for the PWM to operate. This error does not fault the
controller. It is automatically cleared when the force condition is removed.
3 Yes Yes No Frequency
Error
The frequency 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.
4Reserved
5 Yes Yes No Duty Cycle
Error
The PWM duty cycle is either less than zero or greater than 1000.
This error faults the controller. It can be cleared by logic within the User Fault
Routine.
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English