ABB DATX110 3ASC25H209 3BSC980004R784 Digital I/O Terminal Module

The DATX110 3ASC25H209 3BSC980004R784 is an integrated digital input/output terminal base module developed by ABB for Symphony and Symphony Plus distributed control systems. Equipped with 16 isolated 24VDC digital input channels and 16 transistor digital output channels, it acts as a signal termination bridge between the DCS control backplane and field switches, valve position feedback contacts and auxiliary relay loads. The conformal-coated PCB and multi-channel optical isolation design effectively suppress high-frequency electromagnetic interference from variable frequency drives and high-power motors in power plant and chemical control cabinets.

This legacy ABB DCS I/O module has been officially discontinued for new projects and serves as a critical aftermarket maintenance spare for aging thermal power, pulp & paper and petrochemical automation systems. It features pluggable green screw terminal blocks with channel-status LED indicators, supporting hot-swap operation on compatible backplanes. The mechanical anti-misinsertion lock prevents mismatched module installation, and unified Symphony bus pin definitions enable direct plug-and-play replacement without extensive control logic reconfiguration.

Main Specifications

• Brand: ABB; Model Series: DATX110; Main PN: 3ASC25H209; Full Order Code: 3BSC980004R784; System: Symphony DCS
• I/O Configuration: 16-channel 24VDC digital sink/source inputs, 16-channel 24VDC transistor digital outputs
• Electrical Ratings: Input response time 3ms; Output per channel 0.5A, maximum total module load 8A; 500VAC galvanic channel isolation
• Power Supply: 24VDC ±10% backplane power, maximum operating current 0.7A
• Backplane Communication: Symphony internal bus, 10Mbps high-speed data transmission, supports 1:1 hot standby redundant pairing
• Environmental Parameters: Operating -10℃ ~ +60℃; Storage -40℃ ~ +85℃; 5%–95% RH non-condensing, IP20 indoor cabinet rating
• Diagnostic & Termination: Independent LED status indicator for each channel; multi-row screw terminal blocks for 14–24AWG copper wires
• Certifications & Structure: CE industrial EMC certification; conformal coated anti-corrosion PCB; hot-swap supported with matching Symphony chassis
• Matching Hardware: Symphony controller racks, DAPU100 processor modules, field limit switches, solenoid valves and auxiliary relays

Core Functions

• Collect binary status signals from on-site limit switches, valve feedback contacts and safety interlock sensors, and transmit digital state data to the Symphony DCS main controller via backplane bus.
• Output 24VDC transistor switching signals to drive field solenoid valves, auxiliary relays and indicator lights, executing open/close control commands issued by DCS process logic programs.
• Channel-independent galvanic isolation prevents field circuit short-circuits, voltage surges and ground loop noise from damaging core DCS control hardware, improving overall system anti-interference safety margin.
• Per-channel LED diagnostic lights enable rapid on-site fault location for open circuits, short-circuits and power loss, drastically shortening troubleshooting time during equipment inspection.
• Detachable terminal block structure separates internal rack bus wiring and external field cables; all field wiring remains intact during module replacement without full re-termination work.
• Supports automatic bumpless redundant failover within 10ms when paired with a standby DATX110 module, eliminating unplanned production shutdowns for critical continuous-process units.

Application Scenarios

• Digital I/O spare replacement for ABB Symphony DCS control cabinets in coal-fired power plants, combined cycle power stations and hydropower monitoring rooms.
• Field signal termination spare parts for petrochemical refineries, natural gas transmission pipelines and continuous chemical reaction production lines.
• Maintenance backup inventory for pulp & paper mills, metallurgical rolling lines and self-owned industrial power plant distributed control racks.
• Matching I/O terminal accessory paired with Symphony DAPU100 main controllers and boiler, turbine and pipeline auxiliary field equipment.
• Retrofit replacement components for aging Symphony control systems suffering channel signal loss, contact burnout and ground interference misoperation faults.

• Global aftermarket spare stock for process industry maintenance teams managing discontinued ABB Symphony DCS automation hardware worldwide.