Publication 1766-RM001A-EN-P - October 2008
132 Using the High-Speed Counter and Programmable Limit Switch
Programmable Limit
Switch (PLS) File
The Programmable Limit Switch function allows you to configure the
High-Speed Counter to operate as a PLS (programmable limit switch) or
rotary cam switch.
When PLS operation is enabled, the HSC (High-Speed Counter) uses a PLS
data file for limit/cam positions. Each limit/cam position has
corresponding data parameters that are used to set or clear physical
outputs on the controller’s base unit. The PLS data file is illustrated below.
…
PLS Data File
Data files 9…255 can be used for PLS operations. Each PLS data file can
be up to 256 elements long. Each element within a PLS file consumes 6
user words of memory. The PLS data file is shown below:
PLS Operation
When the PLS function is enabled, and the controller is in the run mode,
the HSC will count incoming pulses. When the count reaches the first
preset (High - HIP or Low - LOP) defined in the PLS file, the output
source data (High - OHD or Low - OLD) will be written through the HSC
mask.
At that point, the next preset (High - HIP or Low - LOP) defined in the
PLS file becomes active.
IMPORTANT
The PLS Function only operates in tandem with the HSC of a MicroLogix
1400. To use the PLS function, an HSC must first be configured.
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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