FLX Series

FLX-16DI is an eXpansion module to the CBX Series of Controllers. FLX-16DI offers 16 Digital inputs. 

Other FLX modules include, FLX-8R8 (-H) and FLX-4R4 (-H) to provide System Integrators even greater control flexibility than before. 

The fully programmable CBX-8R8 (-H) with the range of FLX eXpansion Modules providing up to 64 points of control, can be tailored to meet a variety of applications by creating and modifying strategies using new CXproHD Engineering Software. 

PDF Datasheet


FLX-16DI is a field level eXpansion module designed to work with CB Series of BACnet Controllers CBX-8R8 (-H). The CBX-8R8 supports up to three FLX Series eXpansion modules providing up to 64 points of control. The CBX-8R8 features 8 UniPuts™ with Relay and 8 Universal Inputs and is designed for a wide range of applications for intelligent control of HVAC equipment, lighting control, and electrical systems including metering applications.


16 Digital Inputs 

Quick & Easy Installation with Modular Hardware Design 

  • Replace or Extend I/O points quickly and easily. 
  • FLX Modules snap together without the need for the System Integrator to prepare special cabling. However, when necessary, a cable can be used to extend the FLX modules a total distance of 300 meters (1,000 feet) from the CBX controller. 
  • I/O bus / power connection is achieved through a single plug connector, simplifying the installation process and eliminating the possibility of misconnection between components of a CBX system trunk. 

Reduced Diagnostic Time 

  • Tool free diagnostics to facilitate instant identification of wiring faults. 
  • Status LEDs included for all I/O points instantaneously provide visual diagnostic and error status for each connected system point reducing problem solving time. 

Reduce Time On-Site 

  • Pre-configuring of the FLX expansion module via the FLX dip switch addressing facility: 
  • Reduces on-site installation time 
  • Simplifies setup and system checks 
  • Reduces the skill level for hardware upgrade or expansion. 

Efficient Post Installation Checks and Testing 

  • Manual over-ride of UniPuts™ enable easy configuration, quick commissioning and post installation testing without the need to connect to Engineering Centre.  Over-ride of UniPuts™ can be undertaken through Engineering Centre or locally using the HOA facility where available. Hand/Off/Auto local over-ride function (available for FLX UniPuts™) 

Flexibility to Expand 

  • Flexibility to Expand up to 64 points of control with FLX-8R8 and FLX-8R8-H Field Level eXpansion modules. 

FLX Product Models

Additional FLX product models available

4 UniPuts™ with Relay  
4 Universal Inputs 4R4 Controllers  

FLX 4R4-H  
4 UniPuts™ with Relay  
4 Universal Inputs 4R4 Controllers 
Including Hand/Off/Auto Local Override Function 

8 UniPuts™ with Relay  
8 Universal Inputs  

8 UniPuts™ with Relay  
8 Universal Inputs 
Including Hand/Off/Auto Local Override Function 

Product Range

  UniPutsTM with Relay1 Universal Inputs Digital Inputs Modbus RTU
CBT-STAT Bus HOA Switch & Pot. 18 V Aux Power FLX
I/O Modules
CBX-8R8 8 8 0 4* 1 No  Yes   3
8 8 0 4* 1 Yes Yes  3
8 8 0 0 0 No Yes  -
8 8 0 0 0 Yes Yes  -
FLX-4R4 4 4 0 0 0 No Yes  -
FLX-4R4-H 4 4 0 0 0 Yes Yes  -
FLX-16DI 0 0 16 0 0 No Yes  -


Type STM32 ARM Cortex-M3 processor
System Memory 1MByte external SRAM + 16 Mbyte external flash
(soldered to PCB not removable)

Supply Requirements 24 V AC ±20 % 50/60 Hz

Termination PCB mounted plug terminal connections
Conductor Area Max AWG 12 (3.09 mm2) Min: AWG 22 (0.355 mm2)

Temperature & Humidity -13° to 122° F (-25° to 50° C) / 0-90% RH non-condensing
EMC Immunity EN 61326-1: 2013
EMC Emission EN 61326-1: 2013, EN 61000-3-2: 2014, EN 61000-3-3: 2013

Size 4.1 x 3.55 x 2.25” (104 x 89.5 x 57 mm) excluding terminal plugs
Enclosure & Mounting Flame-retardant ABS / DIN Rail
(724) 733-2000
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