User manual

113 Publication 1747-UM011F-EN-P - May 2007

Chapter

Wiring Your I/O Modules

This chapter describes how to wire your I/O modules. It covers the

following:

• Defining sinking and sourcing

• Preparing your wiring layout

• Features of an I/O module

• Recommendations for wiring I/O devices

• Wiring your I/O modules

• Octal label kit installation

• Using removable terminal blocks

Defining Sinking and

Sourcing

Sinking and sourcing are terms used to describe a current signal flow

relationship between field input and output devices in a control

system and their power supply.

• Field devices connected to the positive side (+V) of the field

power supply are sourcing field devices.

• Field devices connected to the negative side (dc Common) of

the field power supply are called sinking field devices.

To maintain electrical compatibility between field devices and the

programmable controller system, this definition is extended to the

input/output circuits on the discrete I/O modules.

• Sourcing I/O circuits supply (source) current to sinking field

devices.

• Sinking I/O circuits receive (sink) current from sourcing field

devices.

Europe: dc sinking input and sourcing output module circuits are the

commonly used options.