WESTINGHOUSE 1C31179G02 Ovation Remote IO Master Unit

The Westinghouse 1C31179G02 is the electronics module of the Ovation Media Attachment Unit (MAU). The MAU is the point of attachment for the fiber-optic cables that carry remote I/O traffic between the PCRR (IOIC) board in the controller cabinet and up to four remote nodes. It converts PCRR-readable signals into fiber-compatible signals and back, and directs messages between the PCRR and one selected remote node at a time. The module works together with an Attachment Unit personality module, which sets the optical wavelength and the maximum link length.

Key Specifications

• Manufacturer: Westinghouse Process Control (Ovation DCS, now Emerson)
• Part Number: 1C31179G02
• Product Type: Media Attachment Unit (MAU) electronics module
• System: Ovation distributed control system, remote I/O subsystem
• Channels: 4 (up to four remote nodes, one addressed at a time)
• Required Personality Module: 1C31181G02 (850 nm, up to 2 km) or 1C31181G04 (1300 nm, up to 4 km)
• Optical Link Length: Up to 2 km (6,560 ft) at 850 nm; up to 4 km (13,120 ft) at 1300 nm
• Recommended Maximum Link: 3.7 km, to stay within standard PCRR time-out settings
• Bus Standard: 10BASE-FL Ethernet physical layer with proprietary protocol
• Host Interface: AUI cable to the PCRR board
• Module Base: 1C31206 MAU Base (holds up to two modules, routes +24 V, terminates the local I/O bus)
• Front Indication: LEDs for fiber connection and remote node power
• Power Supply: +24 V from the MAU base backplane
• Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)
• Storage Temperature: -40 °C to 85 °C (-40 °F to 185 °F)
• Humidity: 0 % to 95 % non-condensing (non-CE Mark), 0 % to 90 % (CE Mark), max wet bulb 35 °C

Key Features

• Four Optical Channels: One MAU serves up to four remote nodes; the module selects and addresses one node at a time.
• Media Conversion: Translates between the PCRR electrical interface and the fiber-optic remote I/O bus in both directions.
• Two-Part Construction: Electronics module carries the Attachment Unit Logic Board and module power; the personality module carries the Attachment Unit Personality Board and the optical connectors.
• Wavelength Set by Personality Module: Fitting 1C31181G02 gives 850 nm / 2 km; fitting 1C31181G04 gives 1300 nm / 4 km.
• Integrated Bus Termination: The MAU base terminates the local I/O bus, so no branch terminator board is needed at the end of a branch that carries a MAU.
• Diagnostic Visibility: Front LEDs report fiber connection and remote node power; loopback and link checks can be run from the controller without disturbing the I/O modules.

Typical Applications

• Remote I/O drops at tank farms, pump stations and utilities located away from the controller cabinet
• Long-distance fiber links between a controller cabinet and remote node cabinets
• Expansion of an Ovation system where I/O must sit near the process rather than near the controller
• Replacement of a failed MAU in an existing remote I/O branch

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