Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | 1C31179G02 |
| Manufacturer | Emerson / Westinghouse |
| System | Ovation DCS |
| Module Type | Media Attachment Unit Electronics Module |
| Function | Remote I/O optical communications |
| Optical Channels | 4 |
| Matching Personality Module | 1C31181G02 |
| Optical Wavelength | 850 nm with 1C31181G02 |
| Documented Link Length | Up to 2 km / 6,560 ft |
| Base Assembly | 1C31206 Media Attachment Unit Base |
| Controller-Side Application | Ovation Controller Cabinet MAU |
| Power Architecture | +24 V supplied through MAU backplane |
Emerson’s Ovation spare-parts documentation identifies 1C31179G02 as an EMOD assembly, Media Attachment Unit, 4-channel. The associated personality module is 1C31181G02, identified for the 4-channel, 850 nm configuration.
The Ovation system documentation further distinguishes the G02 configuration from the G01 version: 1C31179G01 provides two optical channels, while 1C31179G02 provides four. With the 1C31181G02 personality module, the documented optical link length is up to 2 km. The same documentation lists a 4-channel 1300 nm configuration using 1C31181G04, with a documented link length up to 4 km.
Product Introduction
The Emerson 1C31179G02 is an Ovation Media Attachment Unit (MAU) electronics module used to connect an Ovation controller cabinet with remote I/O nodes over optical communication links. It is not an analog input, digital output, or general-purpose Ethernet communication card. Emerson’s spare-parts documentation specifically classifies it as a four-channel MAU electronics assembly.
The module works with a separate personality module, with 1C31181G02 providing the documented 850 nm, four-channel configuration. The MAU is installed in an 1C31206 Media Attachment Unit Base, whose backplane provides the +24 V connection to the attachment-unit modules.
1C31179G02
Application Scenarios & Field Pitfalls
Engineering Pain Point
The main replacement risk is confusing the electronics module, personality module, and optical specification. The 1C31179G02 is only one part of the MAU assembly. A replacement must preserve the channel count and optical configuration used by the connected remote nodes.
Typical Applications
- Power-generation Ovation DCS: extending I/O communications between controller cabinets and remote I/O locations.
- Boiler and turbine systems: connecting distributed process I/O where long cabinet-to-cabinet cable runs make optical links practical.
- Remote equipment buildings: linking remote I/O nodes back to the main Ovation controller cabinet.
- Legacy Ovation installations: maintaining four-channel optical MAU configurations without redesigning the remote-I/O architecture.
Technical Pitfalls to Avoid
- Do not confuse G01 and G02. The G01 version is documented as a two-channel MAU, while 1C31179G02 is four-channel.
- Verify the personality module. The documented 850 nm companion for G02 is 1C31181G02. A 1300 nm configuration uses a different personality module, so the optics should not be assumed interchangeable.
- Check optical-link length and node configuration. The 2 km figure applies to the documented G02 + 1C31181G02 850 nm arrangement. Do not apply the 4 km figure from the 1300 nm configuration to an 850 nm installation.
Related Products
- 1C31179G01 — Two-channel version of the MAU electronics module; intended for a two-channel optical configuration rather than the four-channel G02 arrangement.
- 1C31181G02 — Matching 4-channel, 850 nm personality module for 1C31179G02.
- 1C31181G04 — 4-channel, 1300 nm personality module used with the G02 electronics configuration; associated with longer documented optical links.
- 1C31206 — Media Attachment Unit base supporting the MAU electronics/personality-module arrangement.
- 1C31203G01 — Ovation remote node controller electronics module; serves the remote-node side rather than the controller-cabinet MAU side.
- 1C31204G01 — 850 nm remote-node personality module associated with the remote-node controller architecture.
- 1C31166G02 — Ovation link-controller electronics module using an R1120 CPU; a different communications function from the MAU.
- 1C31177G02 — Ovation local shield-loop interface; this is a field-interface component rather than an optical MAU.
Procurement Check
For 1C31179G02, verify the complete MAU assembly rather than purchasing the electronics module in isolation. Confirm 1C31179G02 + 1C31181G02, the four-channel/850 nm configuration, the 1C31206 base, and the optical link length against the cabinet drawings. The biggest mistake is treating this part as a generic remote-I/O or Ethernet module; its documented function is specifically the Ovation optical Media Attachment Unit.
