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
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Rugged construction for long operational life
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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
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