7I92 1
GENERAL
DESCRIPTION
The MESA 7I92 is a low cost, general purpose, FPGA based programmable I/O card
with 100 BaseT Ethernet host connection. The 7I92 that uses standard parallel port pinouts
and connectors for compatibility with most parallel port interfaced motion control / CNC
breakout cards/ multi axis step motor drives, allowing a motion control performance boost
while retaining a reliable real time Ethernet interface. Unlike the parallel port that the 7I92
replaces, each I/O bit has individually programmable direction and function.
The 7I92 has a simplified UDP host data transfer systems that allows operation in
real time and compatibility with standard networks. The 7I92 provides 34 I/O bits (17 per
connector) All I/O bits are 5V tolerant and have pullup resistors. A power source option
allows the 7I92 to supply 5V power to breakout boards if desired. This 5V power is protected
by a PTC.
Firmware modules are provided for hardware step generation, quadrature encoder
counting, PWM generation, digital I/O, Smart Serial remote I/O, BISS, SSI, SPI, UART
interfaces and more. Configurations are available that are compatible with common
breakout cards and multi axis step motor drives like the Gecko G540 and
LeadshineMX3660/4660. All motion control firmware is open source and easily modified to
support new functions or different mixes of functions.
In addition to standard parallel port breakouts, There are currently six 7I92
compatible breakout cards available from Mesa, the 7I74 through 7I78 and 7I85. The 7I76
is a step/dir oriented breakout with 5 axis of buffered step/dir outputs, one spindle encoder
input, one isolated 0-10V analog spindle speed plus isolated direction and enable outputs,
one RS-422 expansion port, 32 isolated 5-32V inputs and 16 isolated 5-32V 300 mA
outputs. The 7I77 is a analog servo interface with 6 encoder inputs, 6 -10V outputs,
one RS-422 expansion port, 32 isolated 5-32V inputs, and 16 isolated 5-32V 300 mA
outputs. The 7I92 supports two breakout cards so for example a 10 Axis step/dir
configuration or 12 axis analog servo configuration is possible with a single 7I92 and two
Mesa breakout cards.