Honeywell 621-9940C Serial I/O Module

Overview
The Honeywell 621-9940C Serial I/O Module is designed for industrial automation systems requiring reliable serial communication with external devices. It enables stable data exchange between controllers, field equipment, and supervisory systems, ensuring consistent performance in process control environments.

General Information
Part Number: 621-9940C

Manufacturer: Honeywell

Brand / Country of Origin: Honeywell / United States

Series: Serial I/O Modules

Type: Serial Input/Output Module

Application: Industrial communication, device interfacing, process automation

Mounting: Rack or panel-mounted within control cabinets

Technology: Serial communication interface (industrial-grade data transmission)

Power Specifications
Supply Voltage: 24 V DC

Power Consumption: ≤ 6 W

Input Power Source: Backplane or external DC supply

Protection: Overvoltage, short-circuit, and reverse polarity protection

Indicators: LED indicators for power, transmit, receive, and fault status

Communication & Interface
Interface Type: Serial communication interface

Supported Protocols: Industrial serial communication protocols (system dependent)

Function: Enables data exchange between controller and external devices

Diagnostics: Built-in communication monitoring and fault detection

Status Indication: LED-based communication activity display

Configuration: System-configurable via controller settings

Isolation: Electrical isolation between communication ports and system logic

Environmental
Operating Temperature: −20 to +60 °C

Storage Temperature: −40 to +85 °C

Humidity: Up to 95% RH, non-condensing

Vibration Resistance: Suitable for industrial environments

Protection Rating: IP20 (cabinet installation required)

Dimensions & Weight
Dimensions (L × W × H): 164 × 32 × 127 mm

Weight: 0.61 kg

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