24VDC is used to supply myCNC-ET10 control board. The board contains 4 pins for connection +24V (joined internally) and a number of GND pins for convenient connection of external devices. The 24V DC Power Supply and +24V and GND pins are shown in the picture below.
ET10 has 6 channel pulse/dir outputs, with the maximum pulse frequency of 3MHz.
ET10 pulse/dir outputs conform to the RS422 standard and are compatible with most of servo and stepper drivers (line driver with paraphase signals positive and negative polarity). Internal schematic for pulse-dir is shown in the picture below:
ET15 board contains … output pins-
An internal schematic is shown in the picture below. Darlington transistor array chips ULN2003 are used to buffer binary outputs in ET10. Each chip contains 7 transistors and handles up to 7 binary outputs. We recommend not to exceed 0.25A output current for each output pin (however ULN2003 maximum current is 0.5A according to the datasheet).
ET10 pinout for the outputs is shown below:
There are LED indicators for each Output and PWM pin on the ET10 board to control actual Output/PWM state. LEDs are highlighted in the picture below.
The ET10 control board has 48 galvanic isolated binary inputs, 12 groups of 4 inputs each. Each group has a common LED wire and separate power supply pins so inputs can be powered from different power sources. Using PNP and NPN sensors simultaneously is possible too. Schematic of the 4 inputs group is shown in the picture below.
Wires VCCB (common wire) and VCCA are used for external power supply connection. Beside external power supply, internal +24V DC can be used to supply input LEDs, if the correspondent jumpers are closed.
WARNING: If an external Power supply is used, correspondence jumpers for the group should be OPEN
Jumpers to use the internal power supply for each 4-inputs group are shown in the picture below
Connection Examples -
Jumpers for selected group are closed.
Common wire for 4 optocoupler units is connected to internal GND (0V) if the Jumper is closed. A switch should short another optocoupler input to +24V to activate input pin.
Jumper should be closed to connect the optocoupler pin to +24V. A switch should short wire to GND(0V).
ET10 board has 6 Incremental encoder inputs. There are 4 complete ABC encoder inputs (A/B quadrature encoder signals and Z signal) and 2 reduced AB encoder inputs. ET10 encoder inputs conform to the RS422 standard and are compatible with most of the servo drivers and line driver incremental encoders. 34C86 chip is used in ET10 as a receiver for the encoder signals. Internal schematic for line driver encoder inputs is shown in the picture below.
ET10 control board contains 6 channel +/-10V DAC outputs. This outputs can be used for analogue servo drivers closed-loop control, spindle speed control or any other application that requires IN analogue signals in +/-10V range.
myCNC-ET10 Control board has 8 ADC inputs. ADC Channel #0 has differential amplifier input pins and suitable to connect differential analogue signals up to 30V range. The rest 7 of ADC inputs are in the 0 to 5V Range. ADC inputs connectors have also GND and +12V DC output pins for convenient potentiometer connection.
Connectors XT20, XT21 are used to connect ADC inputs. The connector pinout is shown below
The picture below shows an example of a potentiometer connected to ADC2 input.
MyCNC-Et10 control board has a RS422/RS485 bus connector. Modbus ASCII/RTU and Hypertherm Serial communication interfaces are implemented in myCNC-ET10 control board. RS422 connector pinout is shown below: