ABB RDCO-02 | Industrial DCS 16-Channel Digital Output Interface
ABB RDCO-02 | Industrial DCS 16-Channel Digital Output Interface
Brand: ABB
Model: RDCO-02
Product Type: Digital Output Slave Module
Series: Symphony Harmony (Symphony Plus)
Core Function: Receives digital control commands from Symphony Harmony DCS master controllers, converts to 16-channel 24V DC outputs for field actuators (e.g., relays, solenoid valves), and transmits status feedback via Profibus DP.
Key Specs: 16 isolated channels, 24V DC output (max 0.5A per channel), Profibus DP (up to 12 Mbps), -25°C to +60°C operating temperature.
RDCO-02: Product OverviewThe ABB RDCO-02 is a 16-channel digital output slave module designed for integration into ABB Symphony Harmony distributed control system (DCS) I/O racks. Positioned as a controller-to-actuator interface, its primary role is to receive digital control commands from Symphony Harmony master controllers (e.g., AC800M) and convert them into 24V DC output signals for field devices such as relays, solenoid valves, motor starters, and indicator lights. It simultaneously transmits actuator status (e.g., command acknowledgment, fault flags) back to the master via Profibus DP, completing the control loop. This module is critical for executing discrete control actions in continuous processes, where reliable actuation directly impacts operational safety and efficiency.Functionally, the RDCO-02 processes 16 independently isolated output channels, each capable of sourcing up to 0.5A at 24V DC. It employs galvanic isolation (2500VAC) to protect the DCS from field-side electrical disturbances, such as voltage spikes from inductive loads. Communication with the master controller occurs via Profibus DP (up to 12 Mbps), supporting cyclic data exchange for real-time control and acyclic messages for diagnostics. As part of the Symphony Harmony family, the module leverages the platform’s modular architecture, hot-swappable design, and compatibility with ABB’s Control Builder M engineering tool. Benefits include simplified system expansion, reduced wiring complexity through standardized protocols, and unified configuration workflows across I/O racks.
ABB RDCO-02
RDCO-02: Technical Specifications
Model Number: RDCO-02
Manufacturer: ABB
Product Type: Digital Output Slave Module
Number of Channels: 16 (individually isolated)
Output Type: 24V DC sourcing (solid-state)
Output Voltage: 24V DC nominal (18-30V DC range)
Output Current per Channel: Max 0.5A (short-circuit protected)
Communication Protocol: Profibus DP (up to 12 Mbps, master/slave mode)
Operating Temperature: -25°C to +60°C
Humidity Range: 5% to 95% non-condensing
Power Supply: 24V DC (from rack backplane, 18-32V DC range)
Power Consumption: 2.5W (typical, all channels active)
Dimensions: 25mm x 128mm x 115mm (width x height x depth)
Weight: 0.21kg
Certifications: CE, UL, cULus, RoHS
Core Features & Customer ValueThe RDCO-02 is engineered to deliver reliable actuation and simplify maintenance in industrial automation. Its 16-channel density reduces cabinet footprint compared to lower-density modules, minimizing wiring and mounting costs in systems with numerous actuators (e.g., a packaging line with 12 solenoid valves and 4 motor starters). For engineers, this streamlines initial installation and reduces potential points of failure.Galvanic isolation (2500VAC) is critical for protecting the DCS from field-side transients. In chemical plants with solenoid valves, inductive kickback can damage unprotected outputs. The RDCO-02’s isolation ensures the master controller remains unaffected, extending system longevity. Additionally, per-channel short-circuit protection prevents cascading failures if an actuator wiring fault occurs.Built-in diagnostics enhance operational awareness. The module monitors output status (on/off), channel faults (short/open circuit), power supply health, and communication integrity, reporting issues to the DCS master via LED indicators and software logs. For maintenance teams, this reduces troubleshooting time; a failed valve coil can be identified without manual inspection of all field connections.Hot-swap capability allows replacement without system shutdown, essential for continuous processes like power generation. Technicians remove the faulty module and install a new one; the DCS automatically reloads configuration data, eliminating scheduled downtime. Integration with Control Builder M enables engineers to reuse output profiles across projects, cutting commissioning time by 20%.
ABB RDCO-02
Typical ApplicationsThe ABB RDCO-02 is deployed in Symphony Harmony DCS environments requiring discrete actuation. In a petroleum refinery’s crude distillation unit, it controls 16 solenoid valves regulating reflux flow and product draw-off. Profibus DP ensures real-time command execution, while 2500VAC isolation withstands EMI from nearby pumps.At a chemical plant’s batch reactor, the module activates 8 agitator motor starters (via contactors) and 8 cooling water valve solenoids. Its -25°C cold-start capability supports winter startups, and hot-swap functionality allows maintenance during planned turnarounds without halting reactions.In a municipal water treatment facility, the RDCO-02 drives 12 chemical dosing pump contactors and 4 alarm indicator lights. Data on pump status is transmitted to the central SCADA system, enabling remote verification of dosing operations. The module’s compact size (25x128x115mm) fits into space-constrained I/O racks, simplifying retrofits in aging infrastructure.
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