myCNC-ET7 controller board

myCNC-ET7 controller specification

Number of axes

6

Motor driver outputs

pulse-dir,
differential line driver outputs compatible with EIA RS-422 Standard

Maximum pulse frequency

3 MHz

Binary inputs

16x galvanic isolation,
PNP/NPN sensors compatible

Encoder inputs

3x incremental encoder inputs,
differential line driver (EIA RS422 compatible),
hardware decoded, 5MHz max frequency

Binary outputs

5x - pluggable relays 10A, NO/NC contacts
11x - open collector, 24V, 0.25A

PWM outputs

3x - open collector, 24V, 0.25A,

ADC inputs

2x - 0...10V range, differential inputs, fully galvanic isolated
(for plasma arc voltage measure, THC control),
6x - 0...3V range

DAC output

1x - 0...10V (for spindle speed control and relative applications)

RS485/RS422

1x RS422 full duplex serial communication
OR
2x RS485 half-duplex serial communication

External operator panel connector

up to 25 external keys
up to 2 rotary encodersup to 2 double-axes joysticks OR
up to 4 potentiometers (shared with 4x ADC inputs)

Power supply outputs for control computer

2x DC-DC converters 5V 1.5A

 

 myCNC-ET7 connectors description.

 

 

myCNC-ET7 control board connectors description

 

 

Built-in power supply

myCNC-ET7 board contains 2 independent 5V 2A step-down converters which can be used to supply Single board Computer (SBC) and TFT screen to build a complete stand alone CNC control.

Connector X10 has outputs +5V(#1) and +5V(#2) and 2 pins GND. Example connection of SBC Odroid-C2 is shown below

 

Power up Odroid-C2 SBC from myCNC-ET7
Power up Odroid-C2 SBC from myCNC-ET7

 

 

Optional Operator panel board for ET7

myCNC-ET7 control board supports external operator panel which may contains up to 25 keys (matrix 5x5), 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, encoder.

Suggested schematic for external operator panel is shown below.

 

ET7 external operator panel suggested schematics

 

 External operator panel connected to ET7 board via X1 connector. X1 pin description shown on a picture below.

ET7 operator panel connector desctription

 

Optional Operator Panel board ET7-KEY-001 is available for ET7 controller.

Operator panel board for ET7

We can offer custome design Operator Panel Board according requirements. Approximate price is $35/pcs if order with ET7 controller board (MOQ is 10pcs)

 

Open collector Binary outputs & PWN outputs

ET7 contains 11 open collectro outputs and 3 PWM outputs. Output circuit is based on Darlington transistor array ULN2003. According to chip datasheet each output is capabl;e to drive up to 500mA, however we recommend to not exceed 250mA.

 

 

 

Binary inputs

ET7 contains 4 blocks of 4 binary inputs each block. 4 opto-couple leds whithin the bock has common line. Common line of each block is isolated from other blocks. It makes possible to use different power supply or mixed PNP and NPN sensors with different blocks.

Each common line can be shorted to GND by closing jumper switch, If use internal 24V DC power line to supply sensors.

Schematic design of input block is shown below.

 

 ET7 binary inputs description

 

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 be either standard desktop/industrial computer with Linux or MS Windows OS installed
OR
small single board computer like Odroid-C2, Odroid-XU4, Raspberry-Pi3/Pi2

 

 

myCNC-ET7 board contains built-in DC-DC converter and mounting holes to install and power-up Odroid/Raspberry computer board.

 

ET7 with Odroid-C2 computer mounted


 

 Standard monitor with HDMI can be connected to Odroid-C2 computer board. Screen resolution up to 1920x1080 (Full HD) supported.  Fully functional Ubuntu 16.04 Linux and myCNC control software 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" screen with resistive touch to build a complete stand-alone CNC control kit.

 ET7 CNC control kit

 

 

myCNC-ET7 connection examples.

 

Binary inputs

myCNC-ET7 contains galvanic isolated binary inputs, compatible with 2-wire NPN, 3-wire NPN, 3-wire PNP sensors and switchers. Its possible to use internal 24V DC or external power supply with sensors. Connection examples are shown on a pictures below.

myCNC-ET7 inputs connection examples 001
myCNC-ET7 inputs connection examples 001
myCNC-ET7 inputs connection examples 001
myCNC-ET7 inputs connection examples 002

 

 

 

 

 

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