The Honeywell 621-3500 is a compact and reliable 8-point digital input module designed for industrial automation systems based on the IPC 620 PLC platform. This module is engineered to receive 12–24 VDC sink input signals from field devices such as proximity sensors, push buttons, and limit switches, converting them into stable logic signals for PLC processing.
With its efficient design and dependable signal handling, the 621-3500 is widely used in legacy Honeywell systems where consistent low-voltage input acquisition and long-term operational stability are essential.
Technical Specifications
| Specification Item | Details |
|---|---|
| Model | 621-3500 |
| Module Type | Digital Input Module |
| Input Channels | 8 points |
| Input Type | DC Sink Input |
| Input Voltage Range | 12 – 24 VDC |
| Signal Type | Discrete digital |
| Input Configuration | Sink (common negative) |
| Isolation | System/backplane dependent |
| Mounting | IPC rack / PLC backplane |
| Operating Temperature | Industrial standard range |
| Dimensions (W × H × D) | 76 mm × 241 mm × 175 mm (typical module class size) |
| Weight | ≈ 0.68 kg |
| System Compatibility | Honeywell IPC 620 / legacy PLC systems |
Weight converted from approx. 1.50 lb typical listing.
