Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Analog Inputs | 8 differential, software-configurable |
| Input Types | TC (J,K,T,E,R,S,B), RTD (Pt100), 4-20mA, 0-10V, ±100mV |
| Analog Outputs | 4 isolated, 0-20mA / 4-20mA / 0-10V |
| ADC Resolution | 16-bit (effective: 14 bits) |
| Sampling Rate | 10-50 Hz per channel (fixed) |
| Accuracy | ±0.20% FS (25°C); ±0.40% (-40°C to +85°C) |
| Isolation | 1000V RMS (field-to-backplane) |
| CMRR | >70 dB at 50/60 Hz |
| Operating Temp | -40°C to +85°C |
| Power Supply | +5V @ 1.0A; +15V @ 0.4A (VME backplane) |
| Power Dissipation | 8W max |
| Diagnostics | Basic open/short detection, watchdog timer |
| Form Factor | 6U VME (single-slot) |
| Firmware | Factory-programmed (not field-upgradeable) |
| MTBF | >180,000 hours |
Advantages and Key Features
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Universal Inputs – Software-configurable for TC, RTD, or analog signals.
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Integrated CJC – Onboard cold-junction compensation.
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Basic Diagnostics – Open/short and out-of-range detection.
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Watchdog Timer – Failsafe outputs on communication loss.
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Hot-Swap Capable – IEEE 1101.11 compliant.
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Simple Design – Low component count for high reliability.
Application Fields
| Industry | Applications |
|---|---|
| Power Generation | GE Frame 5/6B gas turbines – basic EGT monitoring |
| Steam Turbines | Small GE steam turbines – bearing temperature, pressure |
| Industrial | Cogeneration plants – steam pressure, temperature monitoring |
Comparison with Newer GE Revisions
| Feature | DS3800HMCA1B1A | DS3800HMCA | DS3800HMAC1G1E | DS3800HMAC1H1F |
|---|---|---|---|---|
| ADC Resolution | 16-bit (14 eff.) | 16-bit (14.5 eff.) | 18-bit (16.5 eff.) | 18-bit (16.8 eff.) |
| Accuracy | ±0.20% | ±0.15% | ±0.05% | ±0.04% |
| Max Sampling | 50 Hz | 100 Hz | 500 Hz | 1000 Hz |
| Isolation | 1000V | 1500V | 2000V | 2500V |
| Firmware Upgrade | No | No | Yes (JTAG) | Yes (JTAG) |
| Conformal Coating | No | Optional | Optional | Standard |
| Diagnostics | Basic | Basic | Advanced | Advanced+ |
| MTBF | 180k hrs | 200k hrs | 250k hrs | 280k hrs |
Competitor Comparison:
| Feature | DS3800HMCA1B1A | Siemens 6ES7531-7KF00 | ABB AI810 |
|---|---|---|---|
| Platform | GE VME Speedtronic | S7-1500 (Profinet) | ABB 800xA |
| VME Native | Yes | No | No |
| Accuracy | ±0.20% | ±0.1% | ±0.08% |
Selection Recommendations
| Scenario | Recommendation |
|---|---|
| Existing installation with 1B1A | Continue use if acceptable; spares are limited. |
| Need improved performance | Upgrade to DS3800HMAC1G1E or DS3800HMAC1H1F. |
| Triple-redundant | Use three identical 1B1A modules. Do not mix revisions. |
| Non-GE retrofit | Do not use – strictly for VME Speedtronic. |
| Spare stock | Very limited availability – source refurbished units only. |
| Harsh environment | Not recommended – lacks conformal coating; upgrade to H revision. |
Critical Precautions
Pre-Installation
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Authenticate module – Check GE labels; verify serial number.
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Inspect connectors – Check for bent pins or corrosion.
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Firmware note – Factory-programmed; cannot be updated.
Installation
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ESD protection – Wear grounded wrist strap.
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Backplane voltage – Verify +5V (±2%), +15V (±1.5%), -15V (±1.5%).
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Insertion – Align guides; apply even pressure; never force.
Field Wiring
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Cable – Belden 8760 for TC/RTD; Belden 8424 for 4-20mA.
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Shielding – Ground shield only at module end.
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Separation – 30cm from AC power; 60cm from VFD cables.
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Torque – 0.5-0.6 Nm.
Output Loads
| Output | Load Range |
|---|---|
| 0-10V | ≥2kΩ |
| 4-20mA | 0-600Ω |
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Short-circuit protected; prolonged shorts cause thermal shutdown.
Environmental
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Operating temp – -40°C to +85°C; keep rack <70°C.
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Humidity – 5-95% RH non-condensing; allow 4-hour warm-up if stored <0°C.
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Vibration – 5g (10-500Hz).
Procurement
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Authentic sourcing – Obsolete; source from certified GE repair centers only.
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Refurbished units – Request calibration certificate and minimum 1-year warranty.
Final Summary
The General Electric DS3800HMCA1B1A is an early, obsolete analog I/O module for GE Speedtronic systems. Its ±0.20% accuracy, 1000V isolation, and 50Hz sampling are significantly outdated compared to modern G ( DS3800HMAC1G1E ) and H ( DS3800HMAC1H1F ) revisions. Only consider this module if maintaining an existing installation with identical spares. For upgrades, new builds, or performance-critical applications, choose DS3800HMAC1G1E or DS3800HMAC1H1F for superior accuracy, speed, isolation, and diagnostics. Source refurbished units exclusively from certified GE repair centers.
A-B 1746-P2
A-B 1756-CNBR/D
A-B 1769-OB16
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