Emerson 1C31157G02 Product Description (Ovation SOE Module)
 I. Product Overview

1C31157G02 is the event sequence recording (SOE) module of Emerson (formerly Westinghouse) Ovation DCS system. It is an upgraded / replacement version of 1C31157G01. Its core function is to capture the state changes of digital signals with millisecond-level high precision and timestamp them, which is used for accident traceability, fault analysis, and recollection of interlock events. 

Model: 1C31157G02

Series: Ovation DCS I/O

Function: SOE (Sequence of Events) event sequence acquisition

Supplementary: Requires pairing with 1C31110G01 (24V) / G03 (48V) characteristic module to form 16-point SOE input

Typical industries: Thermal power, oil and gas, chemical industry, metallurgy (critical interlock / trip event recording)

II. Core Functions (compared with G01)

1. High-precision SOE recording (core)

Timestamp resolution: ≤ 1ms (power industry standard)

Event cache: ≥ 4000 entries, power-off retention

Time base synchronization: Supports GPS / Beidou time synchronization, unified system time

2. Signal input capability

Input voltage: 24VDC ±10% (compatible with 48VDC signal)

Input type: Dry contact / Wet contact; NPN/PNP compatible

Level threshold:

24V: High ≥ 18V, Low ≤ 6V

48V: High ≥ 36V, Low ≤ 12V

Isolation: 1500VAC (channel - bus, channel-to-channel isolation)

3. Key differences from G01

G02: Hardware optimization, stronger anti-interference, wider temperature range, better compatibility, used for new projects and replacement of G01 spare parts.

G01: Early version, gradually replaced by G02.

III. Technical Specifications Electrical

Power Supply: 24VDC ±10%, typical power consumption 5.2W

SOE Resolution: ≤1ms

Isolation Voltage: 1500VAC / 1min Environment

Operating temperature: 0℃ ~ +60℃

Storage temperature: -40℃ ~ +85℃

Humidity: 5%–95% RH (no condensation)

Vibration: 5g; Shock: 30g (IEC 60068-2-6)

Protection: IP20 Physics

Dimensions: 122 × 50 × 165 mm (standard Ovation module)

Weight: Approximately 0.33 kg

Installation: DIN rail, supports hot swapping Passage

Cooperative Feature Module: 16-point switch quantity SOE input

Indicator lights: Power, operation, communication, fault, channel status

IV. Typical Applications

Power plant trip / interlock recording: Circuit breaker, protection relay, MFT/ETS switch quantity event sequence capture.

Oil and gas pipeline emergency cut-off (ESD): Valve, pressure / level interlock event traceability.

Chemical reaction vessel safety interlock: Temperature / pressure / level interlock action sequence analysis.

Old system upgrade: Replace 1C31157G01, improve anti-interference and stability.

V. Installation and Pairing Tips

Must be used in pairs: 1C31157G02 + 1C31110G01 (24V) or G03 (48V).

Wiring: Switch quantity uses shielded twisted pair, shield layer grounded at one end; keep away from strong interference equipment such as frequency converters and motors.

Hot swapping: Support online replacement, no need to stop operation.

Software configuration: Set filter (0–100ms), debounce, event triggering method in Ovation, enable GPS time synchronization.

VI. Ordering and Alternatives

1C31157G02: Current mainstream SOE module, can directly replace 1C31157G01.

Matching order: 1C31110G01/G03 (feature module), terminal block, cable.