EMERSON 1C31218G01 Detailed Product Description (Ovation Relay Output Module)

I. Product Basic Information

1C31218G01 is a relay output module of the Ovation DCS system by Emerson (formerly Westinghouse Electric). It belongs to the Ovation 1C series I/O module and is specifically designed to provide dry contact switch quantity output for the system, used to drive solenoid valves, contactors, small motors, valve actuators, and alarm circuits, etc., as the core interface module connecting the control system with strong electric actuators. It is widely used in on-off control scenarios of switch quantities in process industries such as power generation, oil and gas, chemical industry, and metallurgy. 

Model: 1C31218G01

Brand: Emerson (formerly Westinghouse)

Series: Ovation DCS 1C Series I/O

Core Position: Ovation System Relay Output Module - Power Load Control Interface

Function Type: Switch Quantity Relay Output, Load Drive, Electrical Isolation, Status Diagnosis, Surge Protection

Installation Method: Ovation Standard Rack Base (1C31206G01/1C31205G01), supports hot swapping

Origin: United States

Warranty Period: 12 months (Original Factory)

Protection Level: IP20 (Module Body)

Core Value: Dry Contact Passive Output, Strong Isolation Anti-Interference, Wide Load Adaptation, High Reliability Long Life, Maintenance Convenient, Suitable for Switch Control Requirements of Various High Voltage Loads in Industrial Sites, Long-term Stable Operation under Harsh Conditions.

II. Core Functional Characteristics

1. Multi-channel Relay Output, Wide Adaptability of Passive Dry Contacts

Utilize 8 independent Form C (SPDT) relay outputs, each channel has a common terminal, normally open, and normally closed contacts. The design is passive dry contacts, without the need for external power supply to directly drive AC 250V/2A and DC 30V/2A and below types of actuators.

The maximum load current of a single channel is 2A, which can directly drive solenoid valve coils, contactors, small motors, indicator lights, alarm buzzers, etc.; the contacts adopt alloy gold plating process, with low conduction resistance, oxidation resistance, long life, mechanical life ≥ 1 million times, electrical life ≥ 100,000 times (full load), meeting the requirements of industrial high-frequency start-stop scenarios.

Channel-to-channel is completely electrically isolated, with a 2500V AC isolation voltage, avoiding strong electric interference from the load side from entering the control system, and preventing mutual influence between channels. A single-channel failure does not spread, ensuring the safety and stability of the system.

2. Industrial-level Electrical Protection, High Reliability in Harsh Environments

Built-in multiple levels of surge suppression and TVS transient protection, each channel is equipped with an independent surge absorption circuit, capable of withstanding ±6kV surge impact, effectively resisting inductive load disconnection reverse electromotive force, lightning interference, and grid fluctuations, protecting module contacts and rear-end circuits safety.

It has overcurrent, overvoltage, and short-circuit protection functions. When a single channel load is abnormal, it automatically cuts off the output and triggers a fault alarm to avoid module burnout; ESD protection ±20kV, capable of withstanding industrial site static interference, suitable for high dust, high vibration, and strong electromagnetic interference environments.

Operating Temperature Range: 0℃~+60℃, Storage Temperature Range: -20℃~+85℃, Relative Humidity 5%–95% RH (No Condensation), Certified by ISA-S71.04 Class G3 Pollution Level, Tolerant to corrosive gases, salt spray environment, suitable for turbine compartments, outdoor cabinets, explosion-proof areas, etc., extreme conditions.

3. Intelligent Status Diagnosis, Visual Maintenance Efficiency

The module integrates a microprocessor for real-time circuit monitoring, dynamically collecting core parameters such as each channel relay status (suction / disconnection), contact faults, load abnormalities, power status, and communication faults. When an anomaly occurs, it precisely alarms through panel LED indicators.

Equipped with multi-color LED indicators for power, communication, faults, and channel status, the operating status is clear at a glance, and fault channels and types can be quickly located without professional tools; Supports remote diagnosis, module status information can be uploaded to the system through the Ovation backplane bus, enabling remote monitoring, fault location, and historical data traceability.

Supports online hot swapping without disturbance maintenance, which can be plugged in and out of the module while the system is running, and after replacement, it automatically identifies and synchronizes parameter configuration, without the need for shutdown; It adopts tool-free snap-in installation, compatible with the standard base of the Ovation 1C series (1C31205G01/1C31206G01), and is convenient for installation and disassembly, significantly reducing maintenance time.

4. Strong compatibility and flexible expansion, compatible with multiple system architectures

Perfectly compatible with the full range of base units of the Ovation 1C series, including 2-slot base unit (1C31205G01) and 4-slot base unit (1C31206G01), and can be mixed-inserted with digital input/output and analog input/output modules, configured as needed for I/O stations, to build a flexible distributed control system.

The backplane communication uses the Ovation dedicated high-speed bus, with a communication rate of 1Mbps, a data refresh rate of 1ms, no delay in control instruction transmission, ensuring precise synchronization of switch actions; supports redundant system configuration, can be used with redundant controllers and redundant bases, critical circuits can be switched without disturbance, suitable for high-reliability control scenarios.

Supports Modbus RTU expansion communication, can interact with third-party devices through the backplane bus, compatible with multi-brand system integration requirements; the module comes with a channel address configuration switch, can quickly set the channel address without upper software, on-site debugging is convenient.

III. Detailed Technical Specifications

Output Channel Characteristics

Channel Quantity: 8 independent Form C (SPDT) relay outputs

Contact Type: Passive dry contacts (common terminal / normally open / normally closed)

Rated Load: AC 250V/2A, DC 30V/2A (per channel)

Contact Material: Alloy plated gold, low contact resistance, resistant to oxidation

Mechanical Life: ≥ 1 million times (without load)

Electrical Life: ≥ 100,000 times (full load)

Response Time: ≤ 10ms (typical value)

Channel Isolation: 2500V AC (between channels, between channel and system)

Electrical Specifications

Power Supply Voltage: 5V DC (supplied by the Ovation baseboard backplane)

Power Consumption: ≤ 8W (full load)

Surge Protection: ±6kV (TVS transient suppression)

ESD Protection: ±20kV

Backplane Bus: Ovation dedicated bus, rate 1Mbps

Communication Protocol: Ovation dedicated protocol, Modbus RTU

Environmental and Physical Specifications

Operating Temperature: 0℃ ~ +60℃

Storage Temperature: -20℃ ~ +85℃

Relative Humidity: 5%–95% RH (no condensation)

Vibration Resistance: 5g (IEC 60068-2-6)

Impact Resistance: 30g

Pollution Class: ISA-S71.04 Class G3

Size: 280mm (length) × 180mm (width) × 120mm (height)

Weight: Approximately 0.32kg

Certifications: CE, UL, CSA, RoHS, IEC 61000-6-2

IV. Typical Application Scenarios

Power Generation Industry (thermal power / gas turbine control)

Gas Turbine: Fuel solenoid valve control, guide vane actuator switch, ESD emergency shutdown circuit, alarm indicator light drive

Steam Turbine: Main steam valve / speed regulating steam valve solenoid valve control, drain valve switch, shaft protection alarm output, excitation system contactor control

Boiler System: Safety door / pressure relief valve solenoid valve, induced draft fan interlock switch, furnace purge solenoid valve, flame detection alarm output

Plant Auxiliary System: Coal conveying belt start-stop control, water treatment dosing solenoid valve, desulfurization and denitrification damper door switch, fire sprinkler valve control

Oil and Gas Industry (explosion-proof area / load-driven)

Oil and Gas Processing Facilities: Tank inlet and outlet solenoid valves, emergency shut-off valve control, compressor anti-surge valve switch, flare ignition circuit control Compressor unit group: Dry gas seal solenoid valve, lubricating oil pump start/stop, cooling fan control, unit fault alarm output

Long-distance pipeline: Main line cut-off valve switch, pressure relief valve control, pump station equipment interlock, pipeline leakage alarm output

Chemical and process industry (safety interlock・switch control)

Large chemical plant: Reactor feed/outlet solenoid valve, distillation column reflux valve control, emergency shutdown circuit, safety interlock alarm output

Fine chemicals: Explosion-proof zone solenoid valve, inert gas sweeping valve control, precise proportioning pump start/stop, reaction temperature over-limit alarm

Metallurgical industry: Blast furnace gas cut-off valve, hot air furnace combustion valve control, dust removal system solenoid valve, equipment fault alarm output

Other extreme working conditions scenarios

Water treatment: Sewage treatment plant chlorination solenoid valve, sewage valve control, aeration fan start/stop, water quality over-limit alarm output

Offshore platform: Platform equipment solenoid valve, fire protection system control, bilge pump start/stop, long-term stable operation in salt spray environment

Industrial test bench: Test equipment solenoid valve, actuator switch, alarm circuit drive, high-frequency start/stop test scenario adaptation

V. Ordering and Complementary Information

Ordering model: 1C31218G01 (Ovation 8-channel relay output module)

Complementary installation base:

1C31205G01: 2-slot remote node controller base

1C31206G01: 4-slot remote I/O module base

Complementary RNC module:

1C31204G01: Fiber optic remote I/O node module

1C31204G03: Remote node PMOD expansion module

Complementary load equipment: Solenoid valve, contactor, small motor, indicator light, alarm buzzer

Complementary communication accessories: 850nm multimode optical fiber, ST/SC connector, RS-485 shielded cable

Complementary power supply: 24V DC redundant power supply (baseboard power supply), surge protector

Complementary accessories: Module dust cover plate, channel label, LED status label, maintenance toolkit