Connecting the input signals – National Instruments Isolated Analog Input Modules SCC-AI14 User Manual

Page 5

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5

SCC-AI Series Isolated Analog Input Modules

Connecting the Input Signals

The SCC-AIXX has a fixed screw-terminal receptacle and a removable
screw-terminal block, as shown in Figure 1-2.

Figure 1-2. SCC-AIXX Two-Part Screw-Terminal System

After you install the SCC-AIXX, connect the input signals to the removable
screw-terminal block of the module.

1.

Remove power from the signal lines.

2.

Strip 7 mm of insulation from the ends of the signal wires.

3.

Insert the wires into the screw terminals.

4.

Tighten the screws to 0.5 to 0.6 N · m (4.4 to 5.3 lb - in.) of torque.

Each screw terminal is labeled by pin number <1..4>. Pins 1 and 2 form a
channel routed to E Series DAQ device channel X

+8, and pins 3 and 4 form

a channel routed to the E Series DAQ device channel X, where X is 0 to 7
depending on the socket where you plug in the module. The SCC-AIXX
provides channel-to-ground and module-to-module isolation only. It does
not provide isolation between the two channels of the SCC-AIXX. Because
both channels must have the same reference voltage, pins 1 and 3 are
connected together internally. Figure 1-3 shows the SCC-AIXX signal
connections.

1

SCC Screw-Terminal Receptacle

2

Removable Screw-Terminal Block

3

2

1

4

1

2

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