The GE DS200SIOCG1A is a VersaModular Eurocard (VME) Standard Input/Output Board manufactured by General Electric for the Mark V Speedtronic™ turbine control series. Functioning primarily as an Instantaneous Overcurrent Board (SIOC), this module is a critical high-integrity protection device. It is designed to continuously monitor circuit currents against pre-set industrial thresholds, immediately sending a trip command to isolation circuit breakers to prevent severe equipment damage from unexpected power surges or fault currents.
Product Specifications
Technical Parameters
- Model Identification: DS200SIOCG1A
- Functional Acronym: SIOC (Standard Input/Output Overcurrent)
- Manufacturer: General Electric (GE)
- System Series: Mark V Speedtronic
- Operating Voltage: 28 V DC (Standard nominal logic supply)
- Data Transfer Speed: 115.2 Kbps
- Technology Matrix: Advanced surface-mount technology (SMT) with standard PCB conformal coating.
- Hardware Elements:
- Jumpers: 20 configurable hardware jumpers for signal mapping.
- Switch Blocks: 3 switch blocks containing 6 DIP switches each (18 switches total) for threshold programming.
- Fuses: 1 main onboard safety fuse.
Physical Datasheet
- Dimensions: 15.9 cm High x 17.8 cm Wide (Standard Mark V small-format Eurocard layout)
- Weight: 0.41 kg (0.90 lbs)
- Country of Origin: USA
- Terminal Infrastructure: 5 fixed wire terminal blocks (labeled TB-1 through TB-5) supporting up to 33 individual signal wire connections (configured via screw clamps).
Application Fields
The DS200SIOCG1A acts as a frontline defensive unit in large automated drives:
- Turbine Control Protection: Managing overcurrent trips for auxiliary pumps, motors, and field fans in GE Frame gas/steam turbines.
- Power Plants: Serving as a protective relay bridge to isolate generator faults from structural control racks.
- Oil & Gas Refining: Protecting heavy-duty processing compressors from structural phase short-circuits.
- Heavy Machinery Drives: Monitoring high-torque starter circuits within steel rolling mills or mining lifters.
Product Usage Instructions
- Pre-Installation Mapping: Before disconnecting an active or faulty board, carefully diagram and label the placement of the 33 signal wires connected to terminal blocks TB-1 through TB-5. Note down terminal block IDs to avoid cross-wiring.
- Jumper and Switch Optimization: Replicate the exact positions of the 20 hardware jumpers and 18 individual DIP switches from the old board onto the new DS200SIOCG1A. These settings establish the current limits required to trip your circuit breaker safely.
- Chassis Alignment: Slide the Eurocard along the VME rack guide rails. Push evenly until the standard backplane connectors are completely seated into the VMEbus midplane.
- Field Termination: Insert the field wires into terminal clamps TB-1 to TB-5 and torque down the retaining screws firmly. Ensure no loose strands bridge adjacent terminals to prevent a false “Protective Relay Fault.”
- ESD and Voltage Safety: This board handles dynamic overcurrent signals and may carry surface voltages. Always use a grounded anti-static wrist strap and ensure the relevant control core is fully powered down before touching components.
Q&A – Frequently Asked Questions
Q: Can the terminal block wires remain connected during a board swap? A: Unlike newer removable terminal blocks, the standard DS200SIOCG1A utilizes fixed blocks. Wires must be unscrewed and re-terminated. Ensure your site documentation maps out the wire tags correctly before removal.
Q: What is the purpose of the “EA” or alternative suffixes found on some SIOC boards? A: A part number like DS200SIOCG1AEA indicates a later manufacturing hardware revision group. While functional logic is identical, you must match your existing layout’s jumper mappings to ensure proper backwards compatibility within older Mark V chassis.
Q: Where can I obtain current stock information or order a replacement? A: For official lead times, dynamic asset pricing, and premium warranties on certified new or refurbished inventory, please view our GE DS200SIOCG1A VME Board Product Page.
Product Related News
In 2026, the GE Mark V system continues to perform critical infrastructure roles globally, making rugged modules like the DS200SIOCG1A valuable for keeping legacy operations online. Plant operators are prioritizing component level refurbishments of overcurrent protective nodes to counter aging grid behaviors associated with modern distributed energy integration. Industry data indicates that tracking the structural health of the onboard 18 DIP switches is key, as physical oxidation over decades can cause microscopic threshold variances. By carrying out preventative audits on these modular SIOC units, plant managers ensure the continuous reliability of their heavy industrial turbines without undergoing complete, capital-heavy DCS retrofits.
