1241 AMCI Resolver Interface Module

The 1241 is the first resolver interface module for Rockwell Automation’s ControlLogix platform.  The module converts resolver signals to digital position and tachometer data that is reported over the backplane.  Status information is also reported.  The 1241 eliminates the separate resolver decoder box, input card, and associated wiring needed to bring resolver data into a PLC. Like an absolute optical encoder, a resolver is a sensor that converts an angle into electrical signals.  However, this is where the similarities end.  The resolver is an analog device that does not contain sensitive components such as optics and electronics that may be damaged by severe environmental conditions.  Also, the position resolution of a resolver is limited only by the electronics that decode its signals.  When attached to a 1241 module, the resolver gives an absolute position value with up to thirteen bits of position resolution over a six conductor cable.  An absolute optical encoder would require a cable with at least fifteen wires to accomplish the same resolution.