CNC Colchester chipmaster

[Clive S]

I use the mesa 5i25 + 7i76 which from the manual gives:-


The 7I76 is daughtercard/breakout board for use with MESA's 25 pin I/O FPGA
cards like the 5I25. The 7I76 is designed for interfacing up to 5 Axis of step &dir step
motor or servo motor drives and also provides a spindle encoder interface, isolated analog
spindle speed control and 48 isolated I/O points for general purpose field I/O use.
All step and direction outputs are buffered 5V signals that can drive 24 mA. All
outputs support differential mode to reduce susceptibility to noise. An isolated analog
spindle voltage with direction and enable outputs is provided for spindle control as is a
single spindle encoder channel with TTL or differential inputs.

48 points of isolated field I/O are provided for general control use including limit
switch and control panel inputs, coolant enable and tool changer control outputs. Isolated
I/O includes 32 sinking inputs and 16 sourcing outputs. Inputs can sense 5V to 32V signals
and the outputs can switch 5V through 32V signals. Maximum output load is 300 mA.

Outputs are short circuit protected. Field I/O is powered by an isolated 8-32V field power
source.

The 7I76 provides a one channel encoder interface with index. This is intended as a spindle encoder but can be used for other purposes. The encoder input can be programmed for differential or single ended encoders. The encoder interface also provides short circuit protected 5V power to the encoder. When used with single ended encoders, the ENCA+, ENCB+ and IDX+ signals are wired to the encoder and the ENCA-,ENCB-, and IDX- terminal left unconnected.

Mesa cards can be purchased in Europe.