24 Rockwell Automation Publication 5094-UM001E-EN-P - April 2020
Chapter 1 Digital I/O Module Operation in a Logix 5000 Control System
Construct a 5094 FLEX 5000 
I/O System
FLEX 5000 I/O is a small, modular I/O system for distributed applications that 
performs all of the functions of rack-based I/O. The FLEX system contains the 
components pictured below. 
• Adapter - transfers read and write configuration data to and from the 
I/O module
• Terminal base - contains a terminal strip to terminate wiring for two- or 
three-wire devices
• I/O modules - contains the bus interface and circuitry needed to perform 
specific functions related to your application
• End cap - basically a dust cap for the last module in a rack
FLEX 5000 I/O System Power
FLEX 5000 I/O SA Field-Side Power
• FLEX 5000 I/O modules use terminal base (TB) assemblies to connect 
field-side wiring. 
• SA field-side power source is connected to the terminal base (TB) 
assemblies via SA Power terminals.
• If you are using DC voltage for SA power, you must limit the SA field-side 
power source to 10 A, max, at 18…32V DC.
• If you are using AC voltage for SA power, you must limit the SA field-side 
power source to 10 A, max, at 120…240V AC.
• Confirm that the external module power supply is adequately sized for the 
total SA field-side power current draw in the module.
For example, if the total module power current draw, including current 
inrush requirements, is 5 A, you can use a module power supply that is 
limited to 5 A.
Adapter Terminal BaseI/O Module End Caps
STATUS
NET
LINK 1
LINK 2
5094-AENTR
EtherNet/IP
™
 Adapter
FLEX 5000
TM
 I/O
PRP
DLR
POWER
X100
X10
X1
IP ADDRESS
ATTENTION: Power to this equipment and all connected I/O must be 
supplied from a source that is isolated from Mains power via an approved 
isolating transformer constructed with basic insulation.