B885-1xx motion modules are high performance, single axis servo motion controllers contained in a single-width 800-Series I/O module. They are designed to plug directly into the I/O rack of the 984 PLC, although they are capable of standalone operation.

The modules use Schneider Automation's patented Direct Numerical Processing (DNP) technology. Advanced digital brushless motion control eliminates potentiometer adjustments and analog velocity loops for optimal control.

The B885-100 / B885-101 module uses a resolver to provide feedback for the position, velocity, and commutation of the motor. Essentially, a rotary brushless transformer that provides absolute position information to the motion module, the resolver gives the module a high degree of noise immunity.

The B885-110 / B885-111 module additionally has two quadrature encoder interfaces for extra position and velocity feedback.

Control communication interface to the B885-1xx modules can be either through the 800 I/O system backplane or the Modbus/RS-232 serial port. The module is designed to work directly with the Cyberline 1000 series brushless servo amplifiers as well as those of third-party vendors.

The PLC communicates with the motion modules through six input and six output registers with the control instructions providing a powerful, smooth and fast link between the two. Adjustable command buffering and direct register to function bits provide added communication speed for high response functions.

Motion programs, developed using MMDS, are either stored directly in the flash memory of the motion module or as registers in the PLC. The Motion Development Software (MMDS) is an on-line/ off-line, menu driven package (Part # SW-MMDS-1DB) for the IBM-AT or compatible computers. It enables the user to set up, program, operate and diagnose operation of the motion module. The program and file manipulation features are a versatile system for application management. The MMDS communicates via a computer serial port to the Modbus port on the motion module.