System Overview

Each individual channel on the RTD module can receive input signals from 2.

3 or 4-wire RTD sensors or from resistance input devices. You configure each

channel to accept either input. When configured for RTD input types, the

module converts the RTD readings into linearized, digital temperature

readings in °C or °F. When configured for resistance inputs, the module

provides a linear resistance value in ohms.

IMPORTANT 

The RTD module is designed to accept input from RTD

sensors with up to 3 wires. When using 4-wire RTD

sensors, one of the 2 lead compensation wires is not used

and the 4-wire sensor is treated like a 3-wire sensor. Lead

wire compensation is provided via the third wire. Refer

to Wiring Considerations on page 2-8 for more information.

System Operation

The RTD module has 3 operational states:

· power-up

· module operation

· error (module error and channel error)