Introduction

Autotech's PLS and Mini-PLS families have continually set the standard for speed, precision, reliability, and product features in the Programmable Limit Switch marketplace. While retaining the key features and high standards of other Autotech products, the M1920 combines 80 power outputs, fault detection and indication, hundred user-defined PLS programs, and simple, easy-to-learn programming in one compact unit with a NEMA 12 front panel. In addition, each of the hundred PLS programs supports up to 20 ON/OFF setpoint pairs which may be used in any combination of 10 each on the low and high 8 channels, per PLS card. Included also are a fault output that indicates on the display the source of the fault for fast, easy troubleshooting and a motion detector that energizes when the resolver is rotating between motion limits.

Principle of Operation

The M1920 is designed for modularity and flexibility. The Unit has 5 slots for plug-in modules.

The microprocessor in the base unit takes care of the functions common to all the modules. The intelligent module have their own processors to perform their control functions, which allow multiprocessor architecture to achieve fast response time from the control modules. The base unit has a short circuit proof resolver input circuit which decodes resolver (coupled on drive train) signals and broadcasts machine positon slots.

The basic PLS card has 16 PLS outputs, based upon angle on & angle off. And the advanced PLS card can have the outputs selected as either angle ON/angle OFF or angle ON/time OFF.