Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | 1C31125G02 |
| Manufacturer | Emerson |
| System | Ovation DCS |
| Module Category | Digital Output Personality Module |
| Associated Electronics Module | 1C31122G01 |
| Digital Output Capacity | 16 channels |
| Output System | 0–60 VDC |
| Pmod Function | Relay-module interface with local power supply |
| Alternative Use | Field interface through terminal blocks |
| Fuse | 5 × 20 mm cartridge, 3.15A, 250V, fast acting |
| Relay Interface | Supports Ovation relay-panel configurations |
| Architecture | Ovation I/O Base / EMOD-PMOD arrangement |
The important distinction is that 1C31125G02 is not the actual 16-channel output electronics module. Emerson documentation identifies 1C31122G01 as the electronics module and 1C31125G02 as its personality module. The G02 version is intended for relay modules when power is supplied locally from the I/O backplane auxiliary supply. It can also provide the field-terminal interface.
Product Introduction
The Emerson 1C31125G02 is a Personality Module used with the Ovation digital output subsystem. It interfaces the 1C31122G01 16-channel digital output electronics module to relay modules or, where configured, directly to field terminal connections. The underlying digital output subsystem uses sinking transistor outputs for loads up to 60 VDC.
For maintenance teams, the G02 designation matters because it identifies the local-power relay interface configuration. The related G03 uses a different field-power arrangement, so treating G02 and G03 as interchangeable can create wiring and grounding problems. Emerson specifically documents the G02/G03 distinction in the Ovation I/O architecture.
1C31122G01
1C31125G02
Application Scenarios & Field Pitfalls
Engineering Pain Point
A common replacement mistake is ordering 1C31125G02 as though it were a standalone digital output card. It is not. The operating subsystem consists of the electronic module, personality module, base/termination hardware, and—when required—the relay panel. The G02 provides the interface layer between the DO electronics and the external relay or field wiring.
Typical Applications
- Power generation: turbine auxiliary controls, annunciators, interposing relays, and discrete command circuits.
- Boiler and balance-of-plant systems: solenoid and motor-control commands.
- Water and wastewater: pump, valve, and actuator on/off control.
- Legacy Ovation control cabinets: replacement of failed or degraded digital-output personality hardware.
The documented Ovation relay-panel family includes solid-state AC/DC panels, G2R low-power electromechanical panels, and KU high-power electromechanical relay configurations.
Technical Pitfalls to Avoid
- Do not substitute G03 for G02 without checking the power architecture. G02 is for locally supplied relay power; G03 is associated with remote field power.
- Check the companion 1C31122G01. Replacing only the personality module will not resolve a failed DO electronics module.
- Inspect the fuse and relay-panel configuration. Emerson specifies a 3.15A/250V fast-acting 5 × 20 mm cartridge fuse for the G02 Pmod.
- Do not trust generic reseller descriptions. Some current listings incorrectly describe 1C31125G02 as a digital input module, while Emerson’s Ovation documentation clearly identifies it as a digital-output personality module.
Related Products
- 1C31122G01 — The 16-channel digital output electronics module that works with the G02 Pmod.
- 1C31125G01 — Standard DO personality module for direct field-terminal interfacing.
- 1C31125G03 — DO personality module for relay modules using remotely supplied field power.
- 5A22410G01 — 16-position solid-state AC relay panel.
- 5A22410G02 — 16-position solid-state DC relay panel.
- 5A22411G01 — 16-position G2R relay panel.
- 5A22412G01/G02/G03 — KU high-power electromechanical relay-panel configurations.
- 1C31219G01 — Ovation relay output module for a different output architecture.
Procurement Check
For a replacement order, specify 1C31125G02 together with the installed 1C31122G01, relay-panel part number if applicable, I/O base type, and cabinet wiring arrangement. The key verification point is local versus remote relay/field power. A visually similar Ovation Pmod is not automatically a functional substitute.
