Honeywell 621-4350R Digital Input Module
$209.00
$450.00
Description
Product Description
The Honeywell 621‑4350R is a precision Digital Input (DI) module engineered for Honeywell 620/621 Series, TDC 2000, and TDC 3000 distributed control systems. Designed for industrial reliability, it captures discrete ON/OFF signals from field devices such as limit switches, pushbuttons, proximity sensors, interlocks, and alarm contacts.
This module features robust electrical isolation and noise-resistant inputs, converting field signals into logic-level data compatible with the controller. The “R” designation signifies a hot-swap capability, enabling maintenance or replacement without powering down the I/O rack—critical for minimizing process downtime.
The 621‑4350R is widely used in process industries including power generation, petrochemical, refining, and manufacturing, providing dependable signal acquisition in harsh industrial conditions.
Technical Specifications
| Feature | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | 621‑4350R |
| Product Type | Digital Input Module |
| System Compatibility | Honeywell 620/621 Series, TDC 2000, TDC 3000 |
| Input Type | Discrete digital inputs (TTL / 5 VDC logic compatible) |
| Input Channels | 16-point DI (standard variant) |
| Input Voltage | 5 V TTL (logic-level input) / 24 VDC field compatible |
| Isolation | Channel-to-channel and channel-to-logic isolation |
| Signal Conditioning | Debounce filtering, noise suppression |
| Hot-Swap Capability | Yes, supports insertion/removal under power |
| Diagnostics | Individual input LEDs, module health monitoring |
| Mounting | Rack-mounted, standard 620-series form factor |
| Operating Temperature | 0°C to 60°C |
| Weight | 1.10 lbs |
Key Features
-
Reliable acquisition of discrete ON/OFF signals in noisy industrial environments
-
Strong electrical isolation for channel integrity
-
Hot-replaceable design for minimal downtime
-
Rugged construction for long operational life
-
Visual status indicators for rapid diagnostics
-
Seamless integration with Honeywell 620/621 Series and TDC controllers
Applications
The 621‑4350R is ideal for:
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Monitoring limit switches, pushbuttons, and proximity sensors
-
Implementing interlocks and alarm signal collection
-
Machine and process status monitoring in manufacturing and refining plants
-
Systems requiring high uptime and hot-swappable I/O modules
FAQ
Q: Can the 621‑4350R be replaced while the system is powered?
A: Yes, the “R” suffix denotes hot-swap capability, allowing safe replacement without shutting down the I/O rack.
Q: What voltage levels are supported?
A: The module accepts standard 24 VDC field inputs, compatible with 5 V TTL logic levels for controller interface.
Q: How many input channels are available?
A: Standard configuration includes 16 discrete input channels.
Q: Are there similar modules for analog inputs?
A: Honeywell 621 series also offers analog input modules (HLAI) for continuous signal acquisition with high accuracy.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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