Overview

The 57C411 is a Resolver Input Module for the Reliance Electric AutoMax PLC and DCS 5000 systems. Its primary function is to convert the analog sine and cosine signals from a rotary resolver into precise digital values representing shaft angular position and velocity. Designed for high-performance motion control, it offloads the complex resolver-to-digital conversion from the main CPU, ensuring fast and accurate feedback for coordinated drive systems.

Technical Data

Typical Applications

The 57C411 module is essential in applications requiring precise angular feedback and real-time position monitoring, including:

• Printing presses and packaging machinery for synchronized multi-axis motion

• High-speed cut-to-length systems requiring accurate position tracking

• Robotics and machine tool control for absolute shaft position measurement

• Coordinated industrial drive systems where millisecond response is critical

Its high-resolution, real-time output allows complex motion control while maintaining product quality and system synchronization.

FAQ

Q1: What is a resolver and why is the 57C411 needed?
A: A resolver is an electromagnetic sensor providing sine and cosine signals proportional to shaft angle. The 57C411 converts these analog signals into precise digital values usable by the PLC, offloading this processing from the main CPU.

Q2: What is the purpose of the 2-bit revolution counter?
A: It allows the module to track up to 4 complete electrical revolutions of the resolver, providing multi-turn absolute feedback when the mechanical system rotates more than 360°.

Q3: What do the LEDs on the faceplate indicate?
A: LEDs indicate critical diagnostics such as direction of rotation, feedback validity (FDBK OK), common clock status (CCLK OK), and isolated power supply status (IPS OK), simplifying troubleshooting.

Q4: Can the 57C411 be used for long-distance position sensing?
A: Resolvers are robust against electrical noise, but twisted-pair cabling is recommended for both incoming and outgoing signals to maintain accuracy over longer distances.