MA and MB. This type of encoder is known as a quadrature encoder. Quadrature encoders may be either single-
ended (MA and MB) or differential (MA+, MA- and MB+, MB-). The DMC-41x3 decodes either type into quadrature
states or four times the number of cycles. Encoders may also have a third channel (or index) for synchronization.
The DMC-41x3 can be ordered with 120 Ω termination resistors installed on the encoder inputs. See the Ordering
Options in the Appendix for more information.
The DMC-41x3 can also interface to encoders with pulse and direction signals. Refer to the “CE” command in the
command reference for details.
There is no limit on encoder line density; however, the input frequency to the controller must not exceed
3,750,000 full encoder cycles/second (15,000,000 quadrature counts/sec). For example, if the encoder line density
is 10,000 cycles per inch, the maximum speed is 375 inches/second. If higher encoder frequency is required,
please consult the factory.
The standard encoder voltage level is TTL (0-5v), however, voltage levels up to 12 Volts are acceptable. (If using
differential signals, 12 Volts can be input directly to the DMC-41x3. Single-ended 12 Volt signals require a bias
voltage input to the complementary inputs).
The DMC-41x3 can accept analog feedback (±10v) instead of an encoder for any axis. For more information see
the command AF in the command reference.
To interface with other types of position sensors such as absolute encoders, Galil can customize the controller and
command set. Please contact Galil to talk to one of our applications engineers about your particular system
requirements.
Watch Dog Timer
The DMC-41x3 provides an internal watch dog timer which checks for proper microprocessor operation. The timer
toggles the Amplifier Enable Output (AMPEN) which can be used to switch the amplifiers off in the event of a
serious DMC-41x3 failure. The AMPEN output is normally high. During power-up and if the microprocessor ceases
to function properly, the AMPEN output will go low. The error light will also turn on at this stage. A reset is
required to restore the DMC-41x3 to normal operation. Consult the factory for a Return Materials Authorization
(RMA) Number if your DMC-41x3 is damaged.
Chapter 1 Overview ▫ 10 DMC-41x3 User Manual
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