HelmPak Press Control
8
Users Guide
PROGRAMMABLE LIMIT SWITCH OPERATION
PLS software is a group of engineered press-control products for PLC processors. This
software controls the operation-of:
•
Programmable Limit Switch (PLS) for crankshaft synchronization
WHAT IS A PROGRAMMABLE LIMIT SWITCH?
The Programmable Limit Switch is ladder logic for a PLC -based control system that
times or sequences outputs according to precise and repeatable positions of a
crankshaft. Crankshaft positions are monitored by a resolver. You can use PLS to
integrate auxiliary press machinery such as lifters, grippers, blow-off valves, and inter-
press automation into your stamping press control system.
HOW A PLS CHANNEL WORKS
You preset the rotational position (preset angle) at which you want the PLS output to turn
ON. You select how you want the PLS output to turn off: based on a preset angle or a
preset time. If the PLS is to only occur intermittently, based on a number of strokes, then
Intermittent angle or intermittent timer mode is necessary. You will then select the
number of strokes, time duration, or OFF angle based on the desired mode of operation
