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900G01-0202 | Honeywell | Digital Input Module
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- Part Number: 900G01-0202
- Brand: Honeywell
- Type: Digital Input 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 900G01-0202 Digital Input Module
Configured for discrete signal acquisition in HC900 control architectures, the Honeywell 900G01-0202 (900G01-0202 digital input module) provides direct electrical execution of single‑ended contact monitoring, galvanic isolation boundaries, and low‑current state transitions.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 900G01-0202 |
| Brand | Honeywell |
| Origin | Not specified |
| Weight | 0.354 kg (shipping weight 2 kg) |
| Dimensions | 137 mm H × 35.6 mm W (5.4 in × 1.4 in) |
| Operating Temp | Not specified |
| Power Consumption | 5 V at 130 mA max; 24 V at 40 mA max |
| Inputs per Module | 16 single‑ended |
| Input Voltage Source | 15 VDC nominal (supplied by controller) |
| Max Contact Resistance | 1000 ohms |
| Switching Current | 2.6 mA nominal |
| Galvanic Isolation | Field wiring to module logic/backplane |
| OFF to ON Response Time | 4 ms max |
| ON to OFF Response Time | 6 ms max |
Channel‑to‑Channel Isolation and HART/Fieldbus Interaction
Honeywell DCS modules often operate adjacent to mixed‑signal hardware, and the 900G01-0202 maintains isolation boundaries that prevent discrete input transitions from coupling into analog or HART loops. The module’s single‑ended 15 VDC excitation is stabilized to avoid false triggering from superimposed HART frequencies on nearby wiring. In FOUNDATION Fieldbus or Profibus PA environments, wiring separation and grounding practices ensure that digital edge detection does not interfere with temperature modules using cold junction compensation (CJC) circuits.
Frequently Asked Questions
Q: Can the 900G01-0202 be inserted or removed while the rack is powered? A: No. The module is not hot‑swappable. Backplane power must be removed before installation or removal.
Q: How does contact resistance affect input detection? A: Contact resistance above 1000 ohms may prevent the module from reaching the required ON threshold, resulting in missed transitions.
Q: Does the module require external excitation voltage? A: No. The controller supplies the nominal 15 VDC required for input detection.
Field Installation Guidelines
Maintain wiring within the specified contact resistance limits to ensure proper ON/OFF recognition. Route discrete input wiring separately from high‑frequency or analog loops to reduce noise coupling. Shielded cable grounds should be bonded at a single point to avoid circulating currents. Ensure terminal engagement is secure and within the specified conductor size. When integrating with mixed‑signal HC900 racks, preserve isolation boundaries by maintaining proper spacing and grounding between discrete and analog modules.
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