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The EMERSON 8142-DO-DC is a robust 16-channel digital output module engineered for the DeltaV™ distributed control system (DCS) and DeltaV SIS safety instrumented systems. As a core component of Emerson’s M-Series I/O platform, the 8142-DO-DC delivers reliable switching of 24 V DC loads such as solenoid valves, motor starters, alarm beacons, and relay coils in continuous process environments. Designed for both basic process control and safety-critical applications (when deployed in certified redundant configurations), this module ensures deterministic actuation with high electrical isolation and comprehensive self-diagnostics.
Leveraging Emerson’s patented electronic marshalling architecture, the 8142-DO-DC works in tandem with CHARM (CHARacterization Module) technology to eliminate traditional hardwired marshalling panels. Each output channel can be software-defined during engineering or reconfigured later without physical rewiring—dramatically reducing project risk and lifecycle costs. The 8142-DO-DC features individual LED indicators per channel, short-circuit protection, and real-time feedback of output status and fault conditions directly into the DeltaV operator interface. Whether used in a refinery flare system, a pharmaceutical batch reactor, or a power plant boiler safeguard, the 8142-DO-DC provides the precision, resilience, and integration depth expected from Emerson’s industrial automation leadership.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 8142-DO-DC |
| Manufacturer | EMERSON |
| Product Type | Digital Output Module (for DeltaV DCS/SIS) |
| Number of Channels | 16 |
| Output Type | Sourcing (PNP), 24 V DC |
| Maximum Load Current | 0.5 A per channel, 4 A total module |
| Output Voltage Range | 18–30 V DC (nominal 24 V DC) |
| Short-Circuit Protection | Yes, auto-retry with fault reporting |
| Response Time | < 5> |
| Galvanic Isolation | 500 V AC RMS between field and system ground |
| Communication Interface | DeltaV M-Series backplane (via CHARM I/O Carrier) |
| Mounting | Vertical in DeltaV I/O carrier chassis (e.g., MCHM) |
| Operating Temperature | 0°C to +60°C |
| Dimensions (W×H×D) | 35 × 180 × 120 mm (module only) |
| Certifications | CE, ATEX, IECEx, FM, CSA, RoHS compliant |
Main Features and Advantages
Sourcing outputs with high drive capability: The 8142-DO-DC provides true 24 V DC sourcing (PNP) outputs capable of driving up to 500 mA per channel—sufficient for most industrial solenoids and pilot relays without external interposing relays.
Advanced fault detection and protection: Each channel on the 8142-DO-DC continuously monitors for short circuits, open loads, and overcurrent conditions. Upon fault detection, the module isolates the affected channel, logs the event in DeltaV Diagnostics, and attempts automatic recovery—preventing system-wide shutdowns.
Hot-swap and redundancy-ready: The 8142-DO-DC supports online replacement without powering down the I/O carrier, ensuring uninterrupted operation in 24/7 processes. In DeltaV SIS configurations, it can be deployed in redundant pairs to meet SIL 2/3 requirements per IEC 61511.
Seamless CHARM-based electronic marshalling: By pairing the 8142-DO-DC with the appropriate CHARM (e.g., CDO-16), engineers gain full flexibility to reassign output types or signal characteristics in software—future-proofing the I/O infrastructure against late-stage design changes.
Real-time visibility and cyber-awareness: All channel statuses—including commanded state, actual output, and diagnostic flags—are visible in DeltaV Operate and accessible via OPC UA. This transparency supports both operational excellence and compliance with industrial cybersecurity standards like ISA/IEC 62443.
Ruggedized for extreme environments: Conformal-coated circuitry and wide temperature tolerance allow the 8142-DO-DC to operate reliably in offshore platforms, desert compressor stations, or arctic LNG facilities where humidity, salt spray, or thermal cycling challenge lesser modules.
Application Field
The 8142-DO-DC is extensively used in industries where precise, fail-safe actuation of discrete field devices is essential. In oil & gas upstream operations, it controls subsea valve actuators, wellhead isolation solenoids, and emergency depressurization (EDP) valves—often as part of a SIL-rated safety shutdown system. Midstream pipeline terminals rely on the 8142-DO-DC to energize pump start/stop relays, batch valve sequences, and leak detection alarms.
In chemical and petrochemical plants, the module drives catalyst injection solenoids, agitator enable signals, and reactor dump valves, where timing accuracy and fault tolerance prevent runaway reactions. Power generation facilities use the 8142-DO-DC for boiler fuel shutoff commands, turbine trip resets, and auxiliary system sequencing. Even in water/wastewater treatment, it manages sludge valve banks and chemical dosing pumps with high reliability. Across all these scenarios, the 8142-DO-DC transforms control logic into physical action—securely, predictably, and with full traceability within the DeltaV ecosystem.
Related Products
8142-DO-AC: AC voltage version (115/230 V AC) of the 16-channel digital output module
8125-DI-DC: Complementary 16-channel digital input module for complete discrete I/O pairing
CHARM CDO-16: CHARM card used with 8142-DO-DC for 24 V DC sourcing output characterization
MCHM: CHARM I/O Carrier that houses the 8142-DO-DC and enables backplane communication
DeltaV SIS Controller: Safety controller supporting redundant 8142-DO-DC for SIL-certified applications
8130-AO-4: 4-channel analog output module in the same M-Series family for mixed-signal control
DeltaV Diagnostics: Software suite providing real-time health monitoring and predictive alerts for 8142-DO-DC channels
Installation and Maintenance
Pre-installation preparation: Before installing the 8142-DO-DC, confirm that the DeltaV I/O carrier (e.g., MCHM) is de-energized and properly grounded. Ensure the 24 V DC field power supply meets the 18–30 V DC range and can deliver the required current (up to 4 A total). Verify that the correct CHARM (such as CDO-16) is installed in the carrier slot—this defines the electrical behavior of the 8142-DO-DC. Use shielded, stranded copper wire (min. 22 AWG) for all field connections, with shields grounded only at the controller end to avoid ground loops.
Maintenance recommendations: The 8142-DO-DC requires no periodic calibration but benefits from routine inspection via DeltaV Diagnostics. Monitor for recurring short-circuit events that may indicate failing solenoids or wiring damage. Clean dust from the module using dry, non-conductive compressed air during scheduled outages. If an output fails to energize, first verify the control logic command and fuse status before suspecting the module. Thanks to hot-swap capability, a faulty 8142-DO-DC can be replaced in minutes without shutting down the entire I/O rack—minimizing production impact while maintaining system integrity.
