AMCI 1762 Resolver Interface Module

The AMCI 1761 / 1762 Resolver Interface Modules are Allen Bradley 1771 I/O compliant cards that convert resolver signals to digital multi-turn position and tachometer data that can be reported over the backplane using either block or single transfers. These modules eliminate the separate resolver decoder box, PLC input card, and associated wiring needed to bring the digital data into a PLC.

Like an absolute optical encoder, a resolver is a single turn absolute 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 1761 or 1762 module, the resolver gives an absolute 12-bit position value.

The transducers that connect to the 1761 and 1762 contain two resolvers. These resolvers are geared together in a vernier arrangement. The module decodes the separate resolvers and combines their positions into an absolute multi-turn position. The 1761 accepts a single dual-resolver transducer while the 1762 accepts two transducers.