111 Publication 1747-UM011G-EN-P - June 2008
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.

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