Product Details
The Honeywell 621-1100R, also cataloged as the 621-1100R Discrete Input Module, operates as a dedicated hardware component for high-voltage binary state detection and real-time contact status acquisition within Honeywell industrial automation systems. Designed to ingest 8 discrete input channels operating across a 90 to 140 VAC/VDC voltage range with a current draw of 6 to 21 mA, the unit digitizes field contact positions, pressure switches, and auxiliary relay outputs. Drawing a maximum backplane operating current of 30 mA at +5 VDC, the module incorporates internal filtering logic that enforces controlled input turn-on delays of 2.4 ms ±20% and turn-off delays of 17 ms ±20% to attenuate contact bounce across field circuits.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 621-1100R |
| Brand | Honeywell |
| Origin | USA |
| Weight | 0.34 kg (0.76 lbs) |
| Dimensions | 51 mm x 241 mm x 191 mm |
| Operating Temp | 0 to +60 deg C |
| Power Consumption | +5 VDC at 30 mA max |
| Input Channels | 8 points (2 commons, 4 points per common) |
| Nominal Input Voltage | 115 VAC/VDC |
| Operating Voltage Range | 90 to 140 V |
| Input Current Range | 6 to 21 mA (12 mA typical at 115 V) |
| Allowable Off-State Leakage | 2 mA AC / 3 mA DC |
| Input Delay (Off to On) | 2.4 ms ±20% plus 0-0.5 cycles |
| Input Delay (On to Off) | 17 ms ±20% |
| Certifications | CE, UL508, CSA, TUV |
4-20 mA HART Loop Protocol & Channel-to-Channel Isolation
The 621-1100R utilizes optoelectronic isolation barriers between field-side 115 VAC/VDC input terminals and internal +5 VDC logic buses. Arranged into two isolated groups of four channels sharing a common return line, the channel isolation topology prevents high-voltage inductive spikes from crossing into central processor backplanes. This galvanic isolation prevents switching transients on high-voltage discrete input loops from coupling onto adjacent 4-20 mA HART loop protocol signaling lines installed in parallel cabinet raceways.
Frequently Asked Questions
Q: Can the 621-1100R module be hot-swapped while the rack backplane is fully energized?
A: Yes, the module supports live insertion and removal on an energized rack, provided extraction guide tabs are pulled straight out to prevent connector pin binding.
Q: What is the maximum allowable off-state leakage current across connected field contacts?
A: Connected field devices must not exceed an off-state leakage current of 2 mA for AC signals or 3 mA for DC signals to prevent false-on input triggering.
Field Installation Guidelines
- Align the module edge guide with the designated subrack card slot and slide the assembly in until the backplane connectors interface securely.
- Fasten the top and bottom front panel locking screws to establish chassis frame earth grounding and prevent vibration-induced disconnection.
- Wire the 115 VAC/VDC input conductors ensuring field connections adhere to the 4-points-per-common grouping structure across both isolated commons.
- Separate high-voltage AC/DC field input wiring from low-level analog and communication cables within cabinet wire ducts to maintain optimal signal isolation.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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