Galil Motion Control DMC-42 0 Series, Руководство пользователя

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TTL Inputs and Outputs
Main Encoder Inputs
The main encoder inputs can be configured for quadrature (default) or pulse and direction inputs. This
configuration is set through the CE command. The encoder connections are found on the HD D-sub Encoder
connectors and are labeled MA+, MA-, MB+, MB-. The '-' (negative) inputs are the differential inputs to the
encoder inputs; if the encoder is a single ended 5V encoder, then the negative input should be left floating. If the
encoder is a single ended and outputs a 0-12V signal then the negative input should be tied to the 5V line on the
DMC.
When the encoders are setup as step and direction inputs the MA channel will be the step or pulse input, and the
MB channel will be the direction input.
The encoder inputs can be ordered with 120 Ω termination resistors installed. See the TRES – Encoder Termination
Resistors option in the Appendix for more information.
Electrical Specifications
Maximum Voltage 12 VDC
Minimum Voltage -12 VDC
Maximum Frequency (Quadrature)15 MHz
'+' inputs are internally pulled-up to 5V through a 4.7 kΩ resistor
'-' inputs are internally biased to ~1.3V
pulled up to 5V through a 7.1 kΩ resistor
pulled down to GND through a 2.5kΩ resistor
The Auxiliary Encoder Inputs
The auxiliary encoder inputs can be used for general use. For each axis, the controller has one auxiliary encoder
and each auxiliary encoder consists of two inputs, channel A and channel B. The auxiliary encoder inputs are
mapped to the inputs 81-96. The Aux encoder inputs are not available for any axis that is configured for step and
direction outputs (stepper).
Each input from the auxiliary encoder is a differential line receiver and can accept voltage levels between ± 12
volts. The inputs have been configured to accept TTL level signals. To connect TTL signals, simply connect the
signal to the + input and leave the - input disconnected. For other signal levels, the - input should be connected to
a voltage that is ½ of the full voltage range (for example, connect the - input to 6 volts if the signal is a 0 - 12 volt
logic).
Example:
A DMC-4210 has one auxiliary encoder. This encoder has two inputs (channel A and channel B). Channel A input is
mapped to input 81 and Channel B input is mapped to input 82. To use this input for 2 TTL signals, the first signal
will be connected to AA+ and the second to AB+. AA- and AB- will be left unconnected. To access this input, use
the function @IN[81] and @IN[82].
NOTE: The auxiliary encoder inputs are not available for any axis that is configured for stepper motor.
Chapter 3 Connecting Hardware ▫ 31 DMC-42x0 User Manual