Honeywell 621-9930 (6219930) Product Description

621-9930 (6219930) is a Parallel I/O Module of the Honeywell 621 series, specially designed for traditional DCS systems such as IPC 620/621, TDC 3000, and TPS, to achieve high-speed parallel digital input/output signal connection and transmission between the controller and the field devices. 

I. Basic Information

Brand: Honeywell (Honeywell / ISSC)

Full Model: 621-9930 (6219930)

Series: 621 Series I/O Module (IPC 620/621, TPS)

Type: Parallel Digital I/O Module

Production Status: Obsolete (Out of Production)

Weight: Approximately 0.77 kg

Dimensions: Approximately 23 × 13 × 5 cm

Installation: Plug-in into 621 Series I/O Rack

Power Supply: 24V DC (Backplane Bus Power Supply)

Common Suffixes:

621-9930R: ** Hot Swap ** Version

621-9930R-RP: Refurbished / Repaired Version

II. Core Functions

Parallel Digital I/O: Provide multiple parallel digital input/output with high-speed data transmission

Channel Isolation: Electrical isolation between I/O channels to suppress interference and protect the system

Status Monitoring: Real-time monitoring of each channel's on/off status, faults, and short circuits

Signal Compatibility: Supports 24V DC digital signals, compatible with industrial sensors/actuators

System Compatibility: Compatible with IPC 620/621, TDC 3000, TPS, PlantScape systems

Plug-and-Play: Plug-in design, supports live plugging (R version), convenient maintenance

III. Technical Specifications

I/O Configuration: 16 Digital Inputs / 16 Digital Outputs (Total 32 Points)

Signal Type: Parallel Digital (TTL/24V DC)

Input Voltage: 24V DC (±10%)

Output Drive: 24V DC, Maximum 0.5A/Channel

Parallel Bus: 621 Special Parallel I/O Bus (16-bit Data)

Isolation Voltage: 2500V AC RMS (Channel - System Side)

Connector: 2 × 50-pin D-Sub (Field I/O)

Protection: ESD, Overvoltage, Overcurrent, Reverse Polarity, Surge Protection

IV. Environmental Parameters

Operating Temperature: 0°C ~ +60°C

Storage Temperature: -40°C ~ +85°C

Humidity: 5–95% RH (No Condensation)

Vibration Resistance: 10–55 Hz, 0.7 mm Double Amplitude

Protection: IP20 (Installed in Cabinet)

Certifications: CE, UL, CSA, 94V-0 Flame Retardant

V. Interface and Status Indicators

Field Interface: 2 × 50-pin D-Sub (Separate Input/Output)

Backplane Interface: 621 Rack-Specific Parallel Bus

LED Status:

PWR: Green (Normal Power Supply)

IN 1~16: Green (Input Conductive)

OUT 1~16: Yellow (Output Activated)

ERR: Red (Channel Fault / Short Circuit)

VI. Typical Applications

DCS Digital I/O Expansion: Increase Digital I/O Points in IPC 620/621 System

Equipment Status Monitoring: Signal Collection of Industrial Sensors, Limit Switches, Buttons

Actuator Control: Electromagnetic Valves, Relays, Indicators, Motor Start/Stop Control

Production Line Automation: Logic Control of Automotive, Packaging, Metallurgical Equipment

Old System Upgrade: Expansion of I/O Capacity for 620/621, TPS Systems

VII. Model Comparison (621 Series I/O Modules) Table

Parameters: 621-9930, 621-6700, 621-4500

Type: Parallel Digital I/O, Digital Output, Digital Input

I/O Points: 16 Inputs / 16 Outputs, 16 Outputs, 16 Inputs

Communication Mode: Parallel Bus, Parallel Bus, Parallel Bus

Isolation: 2500V AC, 1500V AC, 1500V AC

Hot Swap: 621-9930R, 621-6700R, 621-4500R

Compatible Systems: IPC 620/621, TPS, IPC 620/621, TPS

VIII. Common Faults and Troubleshooting

Input Channel No Signal (IN Light Not On)

Reason: Field Equipment Failure, Wiring Break, 24V Power Missing

Troubleshooting: Test Field Signal, Check Wiring Terminal, Measure Power Voltage

Output Channel Does Not Actuate (OUT Light Not On)

Reason: Controller Does Not Output, Module Failure, Load Short Circuit

Troubleshooting: Check Controller Program, Replace Channel, Check Load Short Circuit

ERR Red Light Always On

Reason: Channel Overcurrent, Short Circuit, Module Hardware Failure

Troubleshooting: Disconnect Load, Replace Channel, Replace Module for Testing

IX. Related Models

Hot Swap Version: 621-9930R

Digital Output Module: 621-6700 / 621-6701

Digital Input Module: 621-4500 / 621-4550

Parallel Bus Selector: 621-9929 / 621-9929R

Serial Link Selector: 621-9928 / 621-9928R

I/O Expansion Module: 621-9000 / 621-9001