DS200SIOBH1ABA | GE Mark V Isolated High Speed Serial

Description

Product Core Brief

• Model: DS200SIOBH1ABA
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Fully isolated high-speed serial communication
• Product Type: Fully Isolated Serial I/O Board (4 ports)
• Key Specs: 4 x RS-232/485 | 921.6 kbps | 2500 VAC isolation | Gold terminals
• Condition: New Original.

Product Introduction

The DS200SIOBH1ABA is a fully isolated high-speed serial communication board for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It provides four independently configurable RS-232 or RS-485 serial ports with complete galvanic isolation between every port and the backplane.

The “ABA” suffix indicates a fully isolated variant. Standard SIOB boards have common grounds between ports (1000 VAC isolation). The ABA revision provides 2500 VAC isolation between each port, between ports and backplane, and includes high common-mode voltage rating (±250 VDC). Each port has its own isolated power domain. Use it when connecting to devices with different ground potentials, long cable runs with induced voltages, or when fault containment is required.

Key Technical Specifications

Key Selling Points & Differentiators

• Complete galvanic isolation between all ports – Standard SIOB boards share common grounds. ABA provides separate isolated power domains for each port. Port 1 can float at +250 VDC while Port 2 is grounded. No ground loops, no cross-port fault propagation.
• 2500 VAC port-to-backplane isolation – Protects Mark V backplane and CPU from field-side transients and ground loops.
• High common-mode voltage rating (±250 VDC) – Connect to devices with floating grounds or long cable runs (up to 2000 ft) with induced voltages. Standard boards are rated ±30 VDC.
• Low isolation capacitance (<100 pF per port) – Standard isolation capacitance is 200–300 pF. Lower capacitance means less high-frequency noise coupling between ports.
• Gold-plated terminal block pins – No oxidation, maintains low contact resistance in humid/corrosive environments.
• Precision baud rate accuracy (±0.05%) – Standard boards are ±1%. Critical for long cable runs at high speeds (921.6 kbps).
• QC includes 3000 VAC isolation test on all domain combinations – 5 domains (4 ports + backplane) = 10 isolation combinations tested.
• 5-year warranty – Extended for isolated variant.

Frequently Asked Questions (FAQ)

Q: What is the difference between SIOBH1AAA (precision) and SIOBH1ABA (isolated)?

Choose ABA for maximum ground separation between ports (different ground potentials). Choose AAA for highest precision and diagnostic features when ground potentials are similar.

Q: Can I replace a standard SIOBH1A with an ABA without changing my wiring?
A: Yes—electrically and functionally compatible. Same pinout, same terminal assignments. However, if your existing wiring has Port 1 and Port 2 grounds tied together externally, separate them to benefit from isolation. The ABA will still work (isolation not damaged), but you lose the isolation benefit.

Q: When do I need fully isolated ports?
A: Three scenarios:

1. Different ground potentials: Port 1 connected to device in Building A, Port 2 to device in Building B (different grounding rods).
2. Fault containment: A short on Port 1 wiring to 120 VAC must not damage Port 2 or the backplane.
3. High common-mode voltage: Long RS-485 cable runs (over 1000 ft) can induce 50–100 VAC between grounds. Standard boards fail. ABA handles ±250 VDC.

Q: What is the isolation capacitance between ports?
A: <100 pF. Standard SIOB boards have 200–300 pF. Lower capacitance reduces high-frequency noise coupling between ports. Critical when one port transmits high-speed data (921.6 kbps) and another port receives sensitive signals.

Q: Does the ABA have conformal coating?
A: No. The ABA focuses on isolation, not environmental protection. For corrosive or humid environments, use SIOBH1AAA (has conformal coating) or order ABA with optional conformal coating (special order, +2 weeks lead time).

Q: What is the common-mode voltage rating?
A: ±250 VDC continuous between any port terminal and ground. Transient rating: ±1500 V for 1 ms (lightning surge). This allows the ABA to be installed on long cable runs where ground potential differences exist.

Q: What QC tests are specific to the ABA revision?
A: Twelve tests (isolation-focused):

1. Isolation port-to-port: 3000 VAC for 5 seconds, all 6 port pairs, leakage <0.1 mA
2. Isolation port-to-backplane: 3000 VAC for 5 seconds, all 4 ports
3. Common-mode voltage test: ±250 VDC applied between port and ground, verify communication at 921.6 kbps
4. Isolation capacitance: measured at 1 MHz, <100 pF per port
5. RS-232 loopback at 921.6 kbps: 10 million bytes, zero errors
6. RS-485 loopback at 921.6 kbps: 10 million bytes, zero errors
7. Baud rate accuracy: ±0.05% at all 13 rates
8. FIFO test: 128-byte transmit/receive
9. ESD test: ±25 kV contact, 20 discharges per port
10. Gold plating thickness: XRF, >0.5 µm
11. Terminal torque verification: 0.55 Nm (all screws)
12. Burn-in: 168 hours at +65°C, all ports at 921.6 kbps, isolation retested

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle with cutouts for 4 gold-plated terminal blocks, hard plastic clamshell case, desiccant pack, humidity indicator. Double-wall box with “ISOLATED INSTRUMENT,” “HIGH VALUE,” “FRAGILE,” “DO NOT STACK” labels. Shock, tilt, temperature indicators. Isolation test report (10 tests) laminated. Gold-plated spare terminal blocks in separate sealed bag. Calibration certificate included. Torque card included. Each board ships individually. Do not unpack without 4-hour temperature stabilization.

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