1C31181G01 | Ovation Remote I/O Module

Overview

The Emerson 1C31181G01 is a Remote I/O Master Attachment Unit Personality Module (PMOD) for the Ovation™ distributed control system. It functions as the personality board within the Media Attachment Unit (MAU), translating signals between the PCRR (Primary Communication Ring Repeater) and fiber optic media for remote node communication up to 2 km.

Data Conflict Note: Verified suppliers provide overlapping but distinct classifications. RMS-DCS explicitly identifies 1C31181G01 as the Personality Module (PAU) within the MAU assembly, housing the Attachment Unit Personality Board. PLCMasters and other suppliers describe it broadly as a Remote I/O Master Unit. JDZJ lists it as Master-Connecting Unit PMOD-2N (2 km). The specifications below reflect the most functionally detailed classification (Personality Module for MAU).

Technical Specifications

• Manufacturer: Emerson (Westinghouse)
• Model: 1C31181G01
• Type: Remote I/O Master Attachment Unit PMOD / MAU Personality Module
• Function: Signal translation between PCRR and fiber optic media
• Distance Rating: 2 km (per jdzj.com: PMOD-2N 2 km)
• Input Voltage: 24 VDC
• Current Rating: 2 A
• Communication Protocol: RS-485 (per PLCDCSPro); Fiber optic (per RMS-DCS)
• Weight: ~0.1 – 3.0 kg (varies significantly by packaging/source)

Key Features

• Translates signals between PCRR logic and fiber optic media
• Provides connectors for fiber optic cables to remote nodes
• Supports up to four remote nodes per MAU assembly
• Hot-swappable design for minimal system downtime

FAQ

Q: What does PMOD-2N mean?
A: PMOD indicates this is a Personality Module; 2N typically refers to a 2-node or 2-channel fiber configuration with a 2 km distance rating.

Q: Is this the complete MAU or just the personality module?
A: 1C31181G01 is the Personality Module (PMOD) component of the MAU. The complete MAU also requires the Electronics Module (1C31179) and base assembly.

Q: Can I use this for copper media instead of fiber?
A: No, the 1C31181G01 is specifically configured for fiber optic media attachment. For copper media, verify alternative PMOD part numbers.

Installation Guidelines

1. Insert the 1C31181G01 PMOD into the MAU electronics module (1C31179).
2. Connect fiber optic cables to the PMOD connectors per the system diagram.
3. Verify fiber polarity and clean connectors before insertion.
4. Confirm remote node controllers have power and are communicating.

Selection Tips

• Order 1C31181G01 when you need a 2 km fiber personality module for Ovation MAU remote I/O.
• For 3.7 km distance, use 1C31181G03 (PMOD-2N 3.7 km).
• For 4-node configurations, verify whether 1C31181G02 (4N 2 km) is required.