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900B01-0301 | Honeywell | Analog Output Module
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- Part Number: 900B01-0301
- Brand: Honeywell
- Type: Analog Output Module
- Dimensions: 3.7×14×13.6cm
- Country of Origin: USA
- Barcode: 8537101190
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Additional Specifications
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Product Description
Honeywell 900B01-0301 Analog Output, 0 to 20 mA, 4 Channel
Configured for analog current‑loop actuation in HC900 platforms, the Honeywell 900B01-0301 (900B01-0301 analog output module) provides direct 0 to 21.8 mA sourcing across four isolated channels for deterministic field device control.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 900B01-0301 |
| Brand | Honeywell |
| Origin | USA |
| Weight | 0.408 kg (shipping weight 2 kg) |
| Dimensions | 137 mm H x 35.6 mm W (5.4 in H x 1.4 in W) |
| Operating Temp | Not specified (ambient de‑rating applies for >10 modules) |
| Output Channels | 4 isolated current outputs |
| Output Range | 0 to 21.8 mA selectable |
| Load Resistance | 750 ohms max |
| Isolation | 500 VDC channel‑to‑channel, 600 VDC channel‑to‑logic |
| Accuracy | 0.1% full scale at reference conditions |
| Minimum Current Sensing | > 3.5 mA per output |
| Calibration | Redundant factory calibration, automatic rejection of bad version, individual channel field calibration |
| Diagnostics | Factory calibration, field calibration, configuration, +24 VDC supply monitoring |
| Output Verification | Feedback to controller confirming current flow |
| D/A Resolution | 12 bits |
| Modules per Rack | 10 max (12 with ambient temperature de‑rating) |
| Power Loading | 5 VDC at 40 mA max / 24 VDC at 200 mA max |
| Mounting | Rack / backplane |
4-20 mA HART Loop Protocol & Channel Isolation Behavior
The module maintains stable analog loop performance when integrated with HC900 systems. Channel‑to‑channel isolation at 500 VDC prevents drift propagation and ensures each output maintains its own reference integrity. When paired with HART‑enabled field devices, the CPU processes digital overlays without disturbing the primary analog span, preserving loop continuity during polling cycles.
Frequently Asked Questions
Q: Can the 900B01-0301 be removed while the rack remains energized? A: No. The module requires full rack power‑down before extraction. The HC900 backplane does not support hot‑swap for analog output modules.
Q: How does ambient temperature affect module count per rack? A: Up to 10 modules may be installed without restriction. Up to 12 modules are permissible when ambient temperature de‑rating guidelines are applied.
Q: Does output verification require additional wiring? A: No. Feedback is internal to the module and reported through the backplane to the controller.
Field Installation Guidelines
Use shielded twisted‑pair wiring for all analog current loops to minimize noise pickup. Maintain single‑point grounding for shields to avoid circulating ground currents. Ensure proper mechanical engagement of the module into the backplane connector before energizing the rack. Avoid routing analog conductors parallel to high‑voltage wiring; use segregated trays where possible. For long loop runs, maintain consistent grounding references to prevent span drift at the field device.
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