Motion Control
Stepper Motors and Step Motor Controllers
  The Motion Group, Inc.



Stepper Motors
Linear Actuators
[PDF file - 700k]

Pico Droplet NEW
Syringe Pumps

Ready-To-Steptm
Black Box
Systems
   - Single Axis
   - Multiple Axis

OEM Card sets
   - Multiple Axis
   - Motor Drivers

CNC Retro Kits
High Res  NEW
Slide Systems
Videos
Software
free hit counter


step motors
American Made
MME-4C


The MME-4C is a complete 1, 2, 3, or 4 channel motion control system on a single 5.6" x 3.7" x 1.8" high card. The card contains three sections: the controller, the multiplexer, and the MD 1.2 step motor drivers (see MD 1.2, OEM Elements). The controller contains a CY 545 (550) step motion microprocessor. The multiplexer section allows the CY545 to control up to four step motor channels by multiplexing the motion signals between the channels. Refer to "SID Software" for a description of the 545 microprocessor and its "High-Level" command set (26 characters and symbols). All actions of this system are controlled by these commands.


In the MME system, the User Bits of the 545 (USRB 0-7) are assigned to control both the 8 line output mux and the 8 line input mux. The output lines (0,1,2,3) select a motor channel; the remainder (4,5,6,7) are available for general purpose output functions. The 8 line input mux inputs the home sensors on lines 0,1,2, 3; the remainder (4,5,6,7) are general purpose. The slave card option can add 5,6,7, or 8 addition motor drivers.

When a channel is selected, the Step pulses and the Direction signal from the CY 545 are directed to a motor driver by the multiplexer. The muxer also directs the Home signal, for that motor, back to the controller.

Normally, one channel is selected at a time as the MME card only generates signals for one step motor. If more than one channel is selected, the motors will make identical moves; Electronic Cam-Shafting. Curves or 3-D motions are produced by single stepping the system and switching motors each step. A major advantage of this system is the ability to trace true point-to-point patterns at up to 1K steps/sec.

Manually jogging the motors is possible by building a simple toggle switch assembly and loading the onboard memory with the jogging control sequence found on the Download page. [ MMCjog.wri ] explains the coding proceedure as well as the switch assembly.

Each system includes CI cables (chassis interface cable). This 10 pin cable connects the Home Sensor and Limit Loop signals back to the controller. The 8 User I/O lines, as well as power, ground, CW/CCW, and slave controls, are available at the 16 pin I/O connector. The on-card (option) AC-DC converter allows operation from a 16 to 24 VAC transformer.

This system is self-contained and can operate stand-alone or under the serial command of a host computer. In stand-alone mode, a host computer is used to "teach" the system by sending a string of commands which are stored, for later execution, in the on-board memory of the controller card.

In direct mode, host commands are executed immediately by the CY545. A combination of these two modes is also possible; typically macro command strings are loaded to memory and then executed as required.
>
The Motion Group, Inc. P.O. Box 669 Clovis, CA 93613-0669     © 1996 - 2007 All Rights Reserved-