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Chapter 1 Overview • 12 USER MANUAL
The DMC-13X8 also provides standard 64 extended I/O points. These TTL I/O points are software
configurable in banks of 8 points, and can be brought out directly on the IOM-1964 I/O module.
Each axis on the controller has 2 encoders, the main encoder and an auxiliary encoder. Each unused
auxiliary encoder provides 2 additional inputs available for general use (except when configured for
stepper motor operation).
System Elements
As shown in Fig. 1.2, the DMC-13X8 is part of a motion control system which includes amplifiers,
motors, and encoders. These elements are described below.
Computer
DMC-1700/1800
Controller
Driver
Power Supply
Encoder Motor
Figure 1.2 - Elements of Servo systems
Motor
A motor converts current into torque which produces motion. Each axis of motion requires a motor
sized properly to move the load at the required speed and acceleration. (Galil's "Motion Component
Selector" software can help you with motor sizing). Contact Galil at 800-377-6329 if you would like
this product.
The motor may be a step or servo motor and can be brush-type or brushless, rotary or linear. For step
motors, the controller can operate full-step, half-step, or microstep drives. An encoder is not required
when step motors are used.
Amplifier (Driver)
For each axis, the power amplifier converts a +/-10 Volt signal from the controller into current to
drive the motor. For stepper motors, the amplifier converts step and direction signals into current.
The amplifier should be sized properly to meet the power requirements of the motor. For brushless
motors, an amplifier that provides electronic commutation is required or the controller must be
configured to provide sinusoidal commutation. The amplifiers may be either pulse-width-modulated
(PWM) or linear. They may also be configured for operation with or without a tachometer. For
current amplifiers, the amplifier gain should be set such that a 10 Volt command generates the
maximum required current. For example, if the motor peak current is 10A, the amplifier gain should
be 1 A/V. For velocity mode amplifiers, 10 Volts should run the motor at the maximum speed.