A DCS Q Co., Ltd. - PLC and DCS Industrial Control Equipment Wholesale
Introduction
The Honeywell 621-3500 is a reliable discrete input module designed for industrial process control and automation systems. It interfaces field-level digital signals, such as switches and sensors, into Honeywell control systems. Built for durability and long-term operation, this module is widely used in legacy Honeywell I/O racks, providing accurate and stable signal processing for alarms, interlocks, and control logic applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Module Type | Discrete Input Module |
| Model | 621-3500 |
| Input Voltage | 12–24 V DC (sink-type input) |
| Number of Input Channels | 8 discrete inputs |
| Signal Type | Digital/discrete signals (sink input) |
| Isolation | Electrical isolation between inputs and system bus |
| Power Supply | Supplied from system backplane |
| Mounting | Rack or panel mounting compatible with Honeywell I/O systems |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | −20 °C to +70 °C |
| Humidity | 5–90% RH, non-condensing |
| Dimensions | 120 × 45 × 150 mm (H × W × D) (approximate) |
| Weight | 0.68 kg |
