MTS FlexTest Models 200 - Manual (Page 224)

MTS FlexTest® Models 40/60/100/200 Controller Hardware
Model 494.32 8-Channel DI/O Breakout Box
Digital I/O and Transition Boards 224
Digital Input Connections for the Model 494.32 DI/O Breakout Box
The Model 494.32 DI/O Breakout Box includes eight opto-isolators that
accept signals from input devices (switch contacts, logic inputs). The opto-
isolators convert the input signals to signals that are compatible with the
input circuits (J54) on the Model 494.44 System Board.
Device connections
Each input device connects to a terminal plug that is inserted into one of the
eight input sockets on the breakout box.
Power connections
You can connect up to two input power sources to connector J19 Input
Power. When two power sources are used, inputs 1–4 are powered by one
source and inputs 5–8 are powered by the other source. These supply
voltages are internally wired to pins 1 and 4 of each input socket.
Note Input devices can also receive power from power sources that are
not connected to the breakout box.
Input power fuses
The internal power and ground connections for each socket include a self-
resetting fuse.
Debounce circuits
The breakout box does not include debounce circuitry. Each digital input has
a 20-ms debounce circuit located on the Model 494.44 System Board.
System board
connections
A cable from J10 Digital Inputs on the DI/O Breakout Box connects all
eight input-device signals to J54 Dig In on the Model 494.44 System Board.