TM 5-3895-374-24-1
Chapter 6
Wiring Your I/O Modules
This chapter describes how to wire you 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 you I/O modules
•
using removable terminal blocks
Defining Sinking and
Sinking and sourcing are terms used to describe a current signal flow
Sourcing
relationship between field input and output devices in a control system and
their power supply
•
Field devices connected to die 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 form sourcing field devices.
(page 3-417)
