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Rockwell Automation Publication 1734-UM013N-EN-P - September 2017 77

Install the Module Chapter 4

In the following two examples, the negative terminal of the sensor power supply

and that of the 1734 terminal base COMMON must be at the same potential.

Use of an external power supply limits diagnostics and increases susceptibility to

noise.

Follow the Guidelines for Wiring Safety Analog Inputs

on page 71.

Figure 45 - 4-wire Voltage or Tachometer Sensor (SIL 2) with External Power Supply

Figure 46 - 4-wire Current Sensor (SIL 2) with External Power Supply

IMPORTANT

You are responsible for making sure that the sensor is receiving appropriate

power. Safety sensors that are not properly powered do not always deliver

accurate signals to the analog input module.

V1 V2 V3

I0 I1 I2 I3

COM COM COM COM

S1 S2 S3

Signal Return and Common are at the same potential.

1734-TB Terminal Bases

Signal (V)

+24V

Cable Shield

Signal Return

4-wire

Sensor

See Figure 47

and Figure 48 on page 78 for tachometer wiring detail.