SYSTEM FUNCTIONS

The MSC-250 servo controller can simultaneously and independently regulate two motion

axes. Programming of the motion control is supplied by a separate computer program or

by a pre-programmed PROM (Programmable Read-Only Memory). Once loaded, the

program is stored in non-volatile memory in the controller.

The controller uses two processors. One processor is labeled “Main Microprocessor” and

the other is labeled “Axis Microprocessor” (refer to “Section 1.3 – Components”). These

two processors communicate through two kilobytes of dual-port RAM (Random Access

Memory) for maximum processing and communication speed. (Dual-port RAM is memory

which is mapped in the same location on each processor and is simultaneously accessible

by both processors.) The main microprocessor processes information from the operating

program, communication ports, and I/O (Input/Output) modules. The axis microprocessor

processes information from the feedback devices and sends commands to the drives.

The MSC-250 can control one or two motion axes, providing precision position-loop control

to each axis. The controller can provide indexing, positioning, cam following, and profiling

control. It can also be used as a passive position sensing device. A third axis (referred to

as a half axis) can only monitor information received from a master axis or controller or

from the pseudo axis. It does not provide any control functions.