Honeywell 621-9938 Serial I/O Module

Description

The Honeywell 621-9938 Serial I/O Module (SIOM) is a dual-port communication card used in Honeywell TDC 3000 and IPC 620/621 systems. It manages the serial I/O card file and interfaces with the 621-9939 Serial Link Module (SLM), ensuring reliable communication between controllers and serial-based field devices.

Specifications

• Model: 621-9938

• Type: Serial I/O Module (SIOM)

• Ports: Dual communication ports for redundant serial I/O lines

• System Compatibility: Honeywell TDC 3000, IPC 620/621

• Function: Controls the serial I/O card file and links to 621-9939 SLM

• Redundancy: Supports redundant and nonredundant configurations

• Termination: Requires 200–300 Ω terminating resistors at extreme ends of the serial channel

• Dimensions: 33 × 23 × 13 cm (approx.)

• Weight: 1.85 lbs (0.84 kg)

• Warranty: 12 months

Features

• Redundant Communication: Dual-port design ensures high reliability in redundant serial I/O configurations

• Flexible Deployment: Can be used in both redundant and nonredundant applications

• Industrial Reliability: Built for mission-critical Honeywell DCS environments

• Protocol Support: Interfaces with multiple serial-based field devices including sensors, actuators, HMIs, and printers

• Diagnostics: Front-panel LEDs provide real-time status and fault indicators for easy monitoring

• Seamless Integration: Works directly with 621-9939 Serial Link Module for processor communication