Redundant fiber SLC-500 in-chassis Ethernet networking modules for PLCs and Ethernet field devices

Multi-fault tolerant, Ethernet communications built for industrial SLC-500 PLC applications

The OLC fiber Ethernet networking module is not an IT switch.  The SLC-500 in-chassis OLC module is an OT (operational technology) networking module that is built for critical industrial Ethernet applications and networking together Ethernet PLCs.

Industrial applications for Ethernet networking are different from IT applications.  If a networking module fails, it needs to be hot swappable and plug and play, not complicated with command line interface programming; and taking minutes for boot up is not acceptable on the plant floor after power cycle.

An industrial Ethernet module needs to be able to transport multiple industrial Ethernet protocols, at the same time -- for example Ethernet/IP, PROFINET, and Modbus TCP, and have options for other industrial protocols such as ControlNet, Data Highway, IEC 61850, R/IO, GE Genius, RS-232, RS-485, RS-422, CTI, Siemens, Texas Instruments Remote I/O, and Modbus Serial.

And, it needs to be compatible with any vendors PLCs or DCS.

That's exactly what the Phoenix Digital fiber Ethernet networking modules provide, and they are available as DIN rail mount, ControlLogix in-chassis modules, CompactLogix in-chassis modules, PLC-5 in-chassis modules, and SLC-500 in-chassis modules.

The OLC module is a SLC-500 in-chassis Ethernet module that is engineered specifically for the 1746 SLC-500 platform.

The OLC module supports Ethernet, ControlNet, Remote I/O, Data Highway+, DF1, RS-232, RS-485, DSL, Modbus, and Modbus RTU.


Built-for control engineers

  • Allen Bradley SLC-500 in-chassis PLC module
  • No command line interface configuration
  • Plug and play, hot swapable
  • 10-second power-up
  • Transports multiple industrial protocols at the same time

Built-for critical networks

  • Redundant fiber between OCR modules
  • Fiber facilitates long distances, eliminates ground loop issues, and impervious to EMI
  • Copper Ethernet to PLCs and field devices
  • 0 second network convergence time if a fiber fails or a module fails

Technical Data

Technical Data
Specifications Fiber Optic Type
Mating Connector
Transmit Launch Power
Receive Sensitivity
Single Mode or Multimode
-15 dBm (Typical Multimode; -18 dBm (Single Mode)
-32 dBm
Power Supply Plug-In Modules (Typical) +5 VDC, 1.5 to 1.8 Amps
Environmental Operating Temperature
Storage Temperature
Relative Humidity
0° to 60° C (32° to 140° F)
-40° to 85° C (-40° to 185° F)
0 to 95% RH, noncondensing
Dimensions OLC Module Single Slot, 1746 Chassis

Order Information

Part Numbers  
OLC-CTN-(1)-(3)-(4)-(6)-(7) ControlNet Communications
(1746 Plug-In modules)
(1) “85”
850 nanometer wavelength selection
1300 nanometer wavelength selection
1550 nanometer wavelength selection
(3) “D”
Interactive Diagnostics (Required for OCX CL I, DIV 2
No Diagnostics
(4) “ST”
ST Fiber Optic Connector Style
SMA Fiber Optic Connector Style (Available with 850nm wavelength only.)
(6) “SM”
Singlemode Fiber Compatibility (Available with 1300 nm or 1550 nm Wavelengths, and ST connector options only.)
Multimode Fiber Compatibility
(7) “EXT” = Extended Capacity Operation (Required for networks with 28 or more OCM/OLC/OCX-CTN modules.)


Phoenix Digital network communications architecture

This video explains typical applications, types of devices connected, how the redundant fiber ring backbone is connected to each module, and what happens when a fiber or module breaks and what you have to do to repair the link.

Phoenix Digital networking diagnostic software

How to use the Phoenix Digital networking diagnostic software to troubleshoot modules or your network.


Softing Inc.