Wiring Signals
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Preparing to Wire Signals
Keep the following recommendations in mind when wiring signals to
the DT9820 Series function modules:
• Use individually shielded twisted-pair wire (size 14 to 26 AWG)
when using the DT9820 Series function module in highly noisy
electrical environments.
• Separate power and signal lines by using physically different
wiring paths or conduits.
• To avoid noise, do not locate the DT9820 Series function modules
and cabling next to sources that produce high electromagnetic
fields, such as large electric motors, power lines, solenoids, and
electric arcs, unless the signals are enclosed in a mumetal shield.
• Prevent electrostatic discharge to the I/O while the DT9820 Series
function modules are operational.
• Connect all unused analog input channels to analog ground.
• When first installing the module, try wiring the signals as
follows:
−
Wire a function generator or a known voltage source to analog
input subsystem 0 using the differential configuration.
−
Wire an oscilloscope or voltage meter to analog output
channel 0.
−
Wire a digital input to digital input line 0.
−
Wire a digital output to digital output line 0.
CAUTION:
To avoid electrostatic sensitivity, it is recommended that you unplug
your DT9820 Series module from the computer before wiring signals.
