Honeywell 621-0021 Digital Input Module

Overview

The Honeywell 621-0021 Digital Input Module offers high-density signal acquisition for industrial control systems. This module is designed to integrate seamlessly with Honeywell IPC 621 Programmable Controllers (PLC) and Distributed Control Systems (DCS). By providing 16 discrete channels, it efficiently monitors on/off signals from devices such as switches, pushbuttons, and limit sensors. Additionally, the module incorporates optical isolation, which protects against electrical noise and voltage surges, ensuring stable and reliable performance even in harsh industrial environments.

Thanks to its compact and robust design, the 621-0021 simplifies installation and reduces wiring complexity. It is engineered specifically for process automation industries, where minimizing space and maintaining precise signal detection is crucial. Furthermore, its industrial-grade construction guarantees long-term reliability, making it ideal for use in industries like oil & gas, chemical processing, power generation, and manufacturing.

Key Features

16 Digital Input Channels: The module provides 16 discrete on/off channels, enabling accurate signal monitoring from field devices.
Optical Isolation: With optical isolation, the module offers superior immunity to electrical noise, ensuring stable operation.
Seamless Integration: It easily integrates with Honeywell IPC 621 PLC/DCS systems, optimizing system performance and reducing integration time.
Space-Saving Design: Its compact size reduces wiring complexity and cabinet footprint, making installation faster and more efficient.
Wide Temperature Range: Operating from -40°C to +70°C, it is suitable for use in extreme industrial conditions.
Industry Certifications: The module is CE, UL, and CSA certified, meeting stringent industrial compliance standards.

Technical Specifications

Parameter	Specification
Model	621-0021
Channels	16 Digital Input Channels
Signal Type	Discrete (On/Off)
Input Voltage Range	Typically 24 VDC (industrial standard)
Isolation	Optically Isolated Inputs
Response Time	Fast, industry-standard
Power Supply	Via IPC 621 backplane
Operating Temperature Range	-40°C to +70°C
Humidity Range	5% to 95% RH, non-condensing
Dimensions (in.)	5.02 in. W x 3.5 in. H x 1.0 in. D
Dimensions (mm)	127 mm W x 89 mm H x 25 mm D
Weight	1.23 lbs (0.56 kg)

Applications

The Honeywell 621-0021 Digital Input Module is ideal for a variety of industrial applications. Specifically, it excels in oil & gas, chemical, power generation, and manufacturing industries. By integrating this module into your Honeywell IPC 621 system, or using it for custom control applications, you can ensure precise and reliable signal acquisition.