The OCM fiber Ethernet networking module is not an IT switch. The PLC-5 in-chassis OCM 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.
The OCM module is a PLC-5 in-chassis Ethernet module that is engineered specifically for the 1771 PLC-5 platform, Siemens / CTI / IT platform, and GE Genius 90-30 I/O.
The OCM module supports Modbus, Data Highway, Remote I/O, ControlNet, CIT / Siemens / Texas Instruments Remote I/O, RS-232, RS-485, RS-422, and GE Genius.
|Specifications||Fiber Optic Type |
Transmit Launch Power
|Single Mode or Multimode |
-15 dBm (Typical Multimode; -18 dBm (Single Mode)
|Power Supply||Plug-In Modules (Typical) |
Standalone Modules (VAC)
Standalone Modules (VDC)
|+5 VDC, 1.5 to 1.8 Amps |
120/220 VAC, 8-10 Watts
24 VDC, 8-10 Watts
|Environmental||Operating Temperature |
|0° to 60° C (32° to 140° F) |
-40° to 85° C (-40° to 185° F)
0 to 95% RH, noncondensing
|Dimensions||OCM Module |
|Single Slot 1771 Chassis, Single Slot GE 90-30, Single Slot CTI Series 2500 |
10.38” H x 3.50” W x 6.14” D
(154.9mm H x 78.7mm W x 139.7 mm D)
|OCM-CTN-(1)-(2)-(3)-(4)-(5)-(6)-(7)||ControlNet Communications |
(1771 Plug-In and Panelmount, Standalone modules)
|850 nanometer wavelength selection |
1300 nanometer wavelength selection
1550 nanometer wavelength selection
|Panelmount, Standalone Enclosure (OCM modules only) |
DIN Rail, Standalone Enclosure (OCX modules only)
1771, 1746, or 1756 Plug-In Module
|Interactive Diagnostics (Required for OCX CL I, DIV 2) |
|ST Fiber Optic Connector Style |
SMA Fiber Optic Connector Style (Available with 850nm wavelength only.)
|24 VDC Operation |
120/220 VAC, 50/60 Hz Operation
125 VDC Operation
|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.