Isolated Analog Input Modules User Guide

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