GE DS3800HLIA1A1B

Parameters

• Input Type: 24V DC discrete (sourcing/sinking, configurable)

• Input Channels: 16 channels

• Input Voltage: 24V DC (nominal), 10–30V DC range

• Input Current: 5mA per channel (typical)

• Response Time: <0.5ms (hardware-accelerated)

• Hardware Latch: Yes – captures short-duration pulses (<1ms)

• Isolation: 2500V RMS optical isolation (channel-to-backplane)

• Power: +5V DC @ 0.8A, +24V DC @ 0.2A (field power)

• Filtering: Programmable input debounce filter (configurable)

• Coating: Conformal coating (suffix B) – single-layer acrylic

• Temp Range: 0°C to +60°C

• Mounting: 6U VME Eurocard, single-slot

• Diagnostics: LED status per channel, open-wire detection, and short-circuit protection

Advantages & Features

• Ultra-fast response (<0.5ms) – the fastest discrete input response in the Mark IV HLI series, designed for critical protection logic

• Hardware latch capability – captures short-duration pulses that might otherwise be missed by firmware polling

• 16-channel density provides sufficient I/O for overspeed and flame detection applications

• Flexible input configuration – channels can be set as sourcing or sinking via jumpers

• Isolated channels protect the backplane from field wiring faults and surges

• B-grade coating provides basic moisture and dust protection for indoor installations

• Front-panel LEDs for per-channel status, fault, and open-wire detection

• Compatible with Mark IV backplanes and some VIe systems (with adapter)

Application Cases

• Overspeed protection – ultra-fast magnetic pickup sensor inputs for turbine overspeed trip logic

• Flame detection – high-speed UV/IR flame scanner signals for burner management and trip systems

• Emergency trip systems (ETS) – critical discrete inputs for emergency shutdown logic

• Turbine start-up sequencing – fast-response speed and position sensors

• Retrofit projects replacing obsolete high-speed discrete input boards in Mark IV systems

Competitor Comparison

• vs. DS3800HLIA (standard A variant): B coating offers better moisture resistance than A – otherwise identical specifications

• vs. DS3800HLEA1C1C (input-only high-speed): HLIA1A1B offers faster response (<0.5ms vs. <0.6ms) and hardware latch capability – HLIA is for critical protection applications

• vs. DS3800HLCA (hybrid I/O): HLIA1A1B is input-only with faster response (<0.5ms vs. <1ms) and hardware latch – better for critical protection

• vs. DS3800HLCB (hybrid I/O): HLIA1A1B is input-only with faster response than HLCB’s <1ms input response

• vs. DS3800HHRB1D1D (standard discrete I/O): HLIA1A1B offers significantly faster response (<0.5ms vs. 3ms) – critical for high-speed protection

• vs. ABB DSDI series: Similar high-speed discrete capability, but GE offers hardware latch and better Mark IV integration

• vs. Siemens 6ES7 series: Similar functionality, but GE offers faster response and hardware latch capability

• vs. Woodward 5437 modules: GE offers faster response and hardware latch for critical protection

Selection Suggestions

• Critical: Confirm input type (sourcing vs. sinking) – jumper settings must match your field devices

• Critical: Verify response time requirement – HLIA1A1B’s <0.5ms is for critical protection; if slower response is acceptable, HLEA or HLCA may be sufficient

• Verify your backplane provides both +5V and +24V field power – this board requires both rails

• Assess channel count – 16 channels cover most overspeed and flame detection applications

• Evaluate environmental conditions – B coating is suitable for clean, dry indoor installations; upgrade to C/D/G/H if needed

• Order mating front connector (p/n may vary – confirm with GE)

• For critical protection applications, purchase with a calibration certificate and 12-month warranty

Precautions

• Critical: Do not exceed 30V DC on input channels – overvoltage may damage the isolation circuits

• Critical: High-speed inputs (<0.5ms) are extremely sensitive to noise – use shielded twisted-pair cables, proper grounding, and dedicated field wiring to avoid false triggers

• Critical: Hardware latch capability requires proper configuration – ensure the latch settings match your application requirements to avoid missing pulses or false captures

• Ensure field power supply (+24V DC) is stable and within 10–30V DC range

• A1 firmware is a baseline revision – verify it supports your specific hardware latch configuration requirements

• Programmable debounce filtering must be set correctly – for critical protection, very short debounce delays (or none) may be needed

• B coating provides basic protection but is not suitable for frequent humidity, salt spray, or chemical exposure – upgrade to C/D/G/H if needed

• Allow 30-minute warm-up before commissioning

• Store in ESD-safe packaging – edge connector is static-sensitive

• Periodically verify input operation every 6 months (critical protection circuits require frequent testing)

• Do not hot-swap – Mark IV backplanes require power-off for insertion/removal

• If replacing a similar high-speed board, verify pinout compatibility – HLIA may differ from other discrete series in pin assignments