Galil has introduced Modbus slave support for the following controllers: the DMC-40x0, DMC-42x0, and DMC-41x3.  These controllers now have the option of being either a Modbus master or slave.  

The DMC-42x0 controller, introduced earlier this year, is the latest addition to the Accelera family. This controller shares most of the firmware features with its counterpart, the DMC-40x0. The DMC-42x0 offers servo update rates as high as 16 kHz with command processing as fast as 40 microseconds. Compared to the prior generation controllers, the DMC-42x0’s update frequency is four times faster with almost double the encoder frequency. The output frequency for steppers, the program memory, and array element space has also been doubled.

Our next two-day product school is Thursday January 28, 2016 through Friday January 29, 2016.  The training will be at our headquarters in Rocklin, CA (near Sacramento).

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Figure 1 - Linear stepper motor

     Modern motion controllers can include the ability to run stepper motors with encoder feedback, resulting in true closed-loop motion control. This mode of motor control is very similar to standard three-phase brushless servo motor control, where the three phases are offset 120 electrical degrees. With steppers, the motor has two phases offset by 90 electrical degrees. The benefits of closed-loop control with stepper motors include greatly improved velocity smoothness and reduced power consumption compared to open-loop steppers and much higher torque at low velocity compared with traditional three-phase brushless servo motors.