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DMC-21x5 Functional Elements
The DMC-21x5 circuitry can be divided into the following functional groups as shown in Figure 1.2 and discussed
below.
DMC-21x5
The main processing unit of the controller is a specialized Microcomputer with RAM and Flash EEPROM. The RAM
provides memory for variables, array elements, and application programs. The flash EEPROM provides non-volatile
storage of variables, programs, and arrays. The Flash also contains the firmware of the controller, which is field
upgradeable.
Motor/Encoder Interface
The controller provides an interface for quadrature decoding of each encoder at up to 15 MHz. For standard servo
operation, the controller generates a ±10 volt analog signal (16 Bit DAC). For stepper motor operation, the
controller generates a step and direction signal.
Axis I/O
The controller provided dedicated I/O for each axis such as forward and reverse limit switches, home switches, and
a high speed latch.
Communication
The communication interface with the DMC-21x5 consists of high speed 100bT Ethernet and an RS232 serial port.
General Purpose and Committed I/O
The DMC-21x5 provides interface circuitry for 8 TTL inputs, 8 TTL outputs, as well as 40 extended IO bits and 8
analog inputs with 12-Bit or 16-Bit ADC with certain accessories. Unused auxiliary encoder inputs may also be used
Chapter 1 Overview ▫ 5
Figure 1.2: DMC-21x5 Functional Elements
DMC-21x5 User Manual 1.0a1
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