myCNC-ET7 controller board
myCNC-ET7 controller specification
|Number of axes||
|Motor driver outputs||
|Maximum pulse frequency||
16x galvanic isolation,
3x incremental encoder inputs,
5x - pluggable relays 10A, NO/NC contacts
3x - open collector, 24V, 0.25A,
2x - 0...10V range, differential inputs, fully galvanic isolated
1x - 0...10V (for spindle speed control and relative applications)
1x RS422 full duplex serial communication
|External operator panel connector||
up to 25 external keys
|Power supply outputs for control computer||
2x DC-DC converters 5V 1.5A
Please find the full ET7 control board connectors descriptions on our online documentation website
Power Supply Connections
myCNC-ET7 control board uses 24VDC . The board contains 4 pins for connection +24V (joined internally) and a number of GND pins for convenient connection of external devices. Power Supply 24V DC and +24V and GND pins are shown on a picture below.
myCNC-ET7 board contains 2 independent 5V 2A step-down converters which can be used to supply a Single board Computer (SBC) and TFT screen to build a complete standalone CNC control.
The built-in power supply connector shown in the picture above has the +5V and +12V outputs as well as 2 GND pins.
ET7 Output pins
ET7 board contains 19 output pins:
- 5 relay outputs (OUT#11 ... OUT#15)
- 11 open collector outputs (OUT#0 ... OUT#10)
3 PWM outputs (PWM#1, PWM#2, PWM#3)
|<code>WARNING: ET7 board rev.1,2 has Output pin names printed on Bottom side of the board.
These names are NOT correct and differ from actual output addresses.
Please check the table below to find out the actual output address</code>
|SILK print||Actual Output Pin Address|
Schematic for ET7 inputs & outputs is shown below:
ET7 has 6 channel pulse-dir outputs, with a max pulse frequency of 3MHz.
ET7 pulse-dir outputs conform to the RS422 standard and are compatible with most of servo and stepper drivers (line driver with paraphase signals of positive and negative polarity). Internal schematic for pulse-dir is shown on a picture below.
The pulse/dir schematic is shown below:
Optional Operator panel board for ET7
myCNC-ET7 control board supports an external operator panel which may contain up to 25 keys (in a 5x5 matrix matrix), 2x rotary encoders and up to 2x double-axes joysticks or 4 potentiometers to control CNC parameters. Functions can be flexibly assigned to any key, resistor, joystick, or encoder.
Suggested schematic for an external operator panel is shown below.
External operator panel is connected to ET7 board via a connector. The connector pinout is shown in the picture below.
Optional Operator Panel board ET7-KEY-001 is available for the ET7 controller.
We can offer custom design Operator Panel Boards according to the particular requirements and specifications. Approximate price is $35/pcs if ordered with ET7 controller board (MOQ is 10pcs)
Open collector Binary outputs & PWN outputs
ET7 contains 11 open collectror outputs and 3 PWM outputs. Output circuit is based on the Darlington ULN2003 transistor array. According to chip datasheet, each output is capablle to drive up to 500mA, however we recommend to not exceed 250mA.
ET7 contains 4 blocks of 4 binary inputs per each block. 4 opto-couple LEDs within the block have a common line. Common line of each block is isolated from the other blocks. This makes it possible to use different power supplies or mixed PNP and NPN sensors with different blocks.
Each common line can be shorted to GND by closing the jumper switch, If the internal 24V DC power line is used to supply the sensors.
Schematic design of the input block is shown below:
3-wire NPN sensor connection example (external power supply)
3-wire PNP sensor connection example (external power supply)
3-wire NPN sensor connection example (internal power supply)
3-wire PNP sensor connection example (internal power supply)
Internal power supply. All of jumpers J1,J2,J3,J4 are open.
As the sensor requires a 24V power supply, it is necessary to connect it to the 24V port, not the 5V.
Switch connection example (internal power supply)
Jumper for selected group (one of J1,J2,J3,J4) is closed.
Common wire for 4 optocouple units is connected to internal +24V if Jumper is closed. Switch should short another optocouple input to GND (0V) to activate input pin.
J(#) - in this case, J4 - should be closed to connect optocouple pin to +24V. Switch should also short the wire to GNC(0V).
Switch connection example (external power supply)
Control computer for myCNC-ET7
myCNC-ET7 board works under control of myCNC software. Control computer needs to build a complete CNC control system based on myCNC. It can either be a standard desktop/industrial computer with Linux or MS Windows OS installed
a small single board computer like the Odroid-C2, Odroid-XU4, or a Raspberry-Pi3/Pi2
myCNC-ET7 board contains a built-in DC-DC converter and mounting holes to install and power-up the Odroid/Raspberry computer board.
A standard monitor with an HDMI port can be connected to the Odroid-C2 computer board. Screen resolution up to 1920x1080 (Full HD) is supported. Fully functional Ubuntu 16.04 Linux and myCNC control software can be installed on the computer. NC code files can be uploaded to the computer through Wifi (Samba Server, FTP Server installed on the computer) or USB disks.
We can offer affordable 10"/15.6" screens with resistive touch to build a complete stand-alone CNC control kit.
myCNC-ET7 connection examples.
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