Smithy Ez-Trol2 User Manual
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a.MESA Electronics 7I47 RS-422 Interface Board (Upper
Board) – Provides 12 RS422 transmitters and 12 RS422 receivers
for differential signaling.
b. MESA Electronics 7I37 Isolated I/O Board (Lower
Board) – Provides 16 Inputs and 8 Outputs of optically isolated
24 Volt I/O.
6. Charge Pump to E-stop – Detects the presence of a signal generated
by the CNC software when it is running. When this signal is not present due
to the CNC control software either not running or not operating correctly,
this module signals an emergency stop.
7. EMI and RFI Filtering devices - Restricts the undesired propagation of electromechanical and
radio frequency interference produced by the machine’s spindle motor axis motor drives. To con-
trol the interference the control system is equipped with both a power line filter module and strate-
gically placed ferrite beads. Twisted pair wiring, shielded cables and attention to wiring layout
inside the control cabinet also reduce undesired emissions.
Figure 4.5 Isolated I/O Boards
Figure 4.6 Charged
Pump to E-Stop
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SmithyCNC EZ-Trol II Control System
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