Product Overview

The GE DS200SIOBH1ACA is a Serial Input/Output(SIO)interface board designed for the Speedtronic™Mark V turbine control system—the predecessor to the Mark VI/VIe platform and still widely deployed in power generation,oil&gas,and industrial facilities worldwide.This module provides dual-channel serial communication capability,enabling the Mark V controller to exchange real-time data with external devices such as distributed control systems(DCS),remote I/O terminals,operator workstations,protection relays,flow computers,and legacy plant equipment.

Housed in a standard 6U Eurocard format and installed within the Mark V core or auxiliary I/O rack,the DS200SIOBH1ACA supports industry-standard serial protocols including:

Modbus RTU(most common for SCADA integration)

GE Genius Bus(for interfacing with older GE PLCs or drives)

Custom ASCII-based protocols(for vendor-specific devices)

Each channel can be independently configured for RS-232(short-distance,point-to-point)or RS-485(long-distance,multi-drop)operation,with selectable baud rates up to 115.2 kbps,parity,data bits,and stop bits—all programmable via the Mark V Toolbox software or on-board DIP switches(depending on firmware version).

The”ACA”suffix typically denotes a specific hardware revision with defined I/O mapping,connector type(often DB9 or terminal block),and firmware compatibility—ensuring seamless drop-in replacement in existing systems.The board features opto-isolated communication lines,transient voltage suppression,and conformal coating,making it suitable for electrically noisy environments near switchgear,motors,or high-voltage cabling.

By enabling reliable serial data exchange,the DS200SIOBH1ACA plays a key role in plant-wide integration,allowing the Mark V to share turbine speed,load,alarm status,and trip data while receiving setpoints or mode commands from higher-level systems—critical for compliance,remote monitoring,and coordinated control.

Technical Specifications

Parameter Name Parameter Value

Model DS200SIOBH1ACA

Manufacturer General Electric(GE Power/GE Vernova)

Product Type Dual-Channel Serial I/O Board

Compatible System Speedtronic Mark V(TMR and Simplex)

Communication Channels 2 independent serial ports

Interface Options RS-232 and/or RS-485(software-selectable per channel)

Supported Protocols Modbus RTU,GE Genius,ASCII,custom protocols

Baud Rate Range 300 bps to 115.2 kbps

Data Format 7/8 data bits,even/odd/none parity,1/2 stop bits

Isolation Opto-isolation on data lines(typically 500–2500 Vrms)

Connectors DB9 male/female or removable terminal blocks(varies by revision)

Power Supply+5 VDC,±12 VDC via backplane

Operating Temperature-20°C to+70°C

Mounting 6U Eurocard slot in Mark V I/O chassis

Certifications CE,UL 508,CSA,IEEE standards for industrial controls

Dimensions~233 mm(H)×160 mm(W)×30 mm(D)

🔔Note:Protocol configuration is typically managed through the Mark V Application Code(written in C or ladder logic)and downloaded via the Toolbox software.Physical wiring must match the selected electrical standard(e.g.,RS-485 requires A/B differential pairs with termination).

Main Features and Advantages

The GE DS200SIOBH1ACA delivers robust,deterministic serial communication in legacy infrastructure where Ethernet was not originally available.Its dual-port design allows simultaneous connection to,for example:

A DCS master station(via Modbus RTU over RS-485)

A local HMI or printer(via RS-232)

Key advantages include:

Backward compatibility:Integrates aging sensors and meters without costly replacements.

Noise immunity:Isolation and differential signaling prevent data corruption in high-EMI zones.

Diagnostic visibility:On-board LEDs indicate TX/RX activity,port errors,and power status.

Long cable support:RS-485 enables runs up to 1200 meters at lower baud rates.

Proven field reliability:Many units have operated continuously since the 1990s with no failures.

Unlike USB-to-serial adapters or third-party gateways,the DS200SIOBH1ACA is natively integrated into the Mark V scan cycle,ensuring data updates occur within the turbine’s real-time control loop—essential for safety-critical coordination.

Application Field

The GE DS200SIOBH1ACA is commonly used in:

Coal and gas-fired power plants:Sending turbine MW output and alarms to DCS

Hydroelectric stations:Interfacing with water level sensors or spillway controllers

Industrial cogeneration:Sharing steam pressure and temperature with boiler controls

Oil&gas compression:Exchanging run status with pipeline SCADA via Modbus

Marine propulsion:Communicating with shipboard navigation or load-sharing systems

It is especially valuable during brownfield modernization,where the Mark V remains operational but must feed data to new IIoT platforms or cloud historians via protocol converters.

Related Products

DS200CPRB:Central processor board for Mark V

DS200TCQAG1A:Thermocouple input board

DS200SDCCG1A:Servo/control card for fuel valves

Mark V I/O Rack(e.g.,P/N 20H9995G01):Chassis housing the SIOB

Toolbox Software:Configuration and diagnostics suite for Mark V

EX2100 Excitation System:Often paired with Mark V for generator control

Serial-to-Ethernet Gateways:For bridging DS200SIOBH1ACA data to modern networks

Installation and Maintenance

Pre-installation:

Confirm firmware and application code support the desired protocol on the target channels.

Use shielded twisted-pair cable for RS-485;ground shield at one end only.

Verify pinout matches your device(e.g.,Modbus RTU typically uses pins 1/2/5 on DB9).

Ensure proper termination resistors(120Ω)are installed at both ends of RS-485 bus.

Maintenance:

Monitor Mark V alarm logs for“Serial Comm Fault”or CRC errors.

Clean edge connectors annually with contact cleaner to prevent intermittent faults.

Test loopback functionality using a null modem cable during outages.

Keep spare DS200SIOBH1ACA units in climate-controlled,anti-static storage.

Product Guarantee

Every GE DS200SIOBH1ACA we supply is 100%new surplus or professionally refurbished to OEM specifications,fully tested for serial functionality,isolation integrity,and thermal stability in a live Mark V test rack.We provide a 24-month warranty against defects and lifetime technical support from certified GE automation engineers.Because serial communication underpins plant safety and regulatory reporting,we guarantee only authentic,rigorously validated components—ensuring your Mark V system remains connected,compliant,and operational for years to come.

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