Honeywell 900G01-0202 Contact Closure Digital Input Module

Honeywell 900G01-0202 Contact Closure Digital Input Module

The 900G01-0202 is a self-powered 16-channel Digital Input module for the Honeywell HC900 controller. It is designed to interface directly with dry contacts, switches, and relays without requiring external field power.

Core Technical Specifications

• Brand: Honeywell
• Model Number: 900G01-0202
• Product Type: Digital Input (DI) Module, Contact Closure
• Inputs per Module: 16 Channels (Single-Ended)
• Input Type: Dry Contact (Voltage-Free)
• Voltage Supplied by Module: 15 VDC Normal (to External Contact)
• Maximum Contact Resistance: 1000 Ohms
• Switching Current: 2.6 mA Nominal
• OFF to ON Response Time: 4 ms Maximum (excluding controller scan & backplane transmission)
• ON to OFF Response Time: 6 ms Maximum (excluding controller scan & backplane transmission)
• Galvanic Isolation: Between Field Wiring (Input/Output) and Module Logic
• Common Terminals: 4 Terminals to Simplify Field Wiring Groups
• Channel Status Indicator: Green LED per Channel (Illuminates when input circuit is closed/ON)
• Module Status LED: Green Blinking (Active Scan), Red (Fault/Diagnostic)
• Logic Inversion: Supported in Controller Software
• Operating Temperature: 0°C to +60°C (Standard HC900 Range)
• Power Supply: Powered from HC900 Backplane

Module Features & Design

• Self-powered design provides 15VDC to the field contact, eliminating the need for separate external power supplies.
• Accepts dry contacts (e.g., switch, relay, pushbutton) with resistance up to 1000Ω.
• Fast response times (4ms ON, 6ms OFF) ensure accurate detection of contact state changes.
• Four common terminals allow flexible grouping of field wiring for different signal sources.
• Individual green LEDs per channel provide immediate visual feedback for contact closure status.
• Galvanic isolation between field wiring and module logic protects the controller from electrical noise and transients.
• Ideal for monitoring status of mechanical switches, float switches, and relay contacts.

Installation & Wiring Guidelines

• Install in a compatible Honeywell HC900 rack. The module receives power from the backplane.
• Connect one side of the dry contact to the desired input terminal on the module.
• Connect the other side of the dry contact to one of the four common terminals.
• Multiple contacts can share a common terminal to reduce wiring complexity.
• Ensure the total contact resistance (including wire resistance) does not exceed 1000Ω.
• For long wire runs, consider wire gauge to minimize loop resistance and ensure reliable operation.
• The module is for voltage-free contacts only. Do not connect external voltage sources to the inputs.

Typical Applications

• Monitoring manual pushbuttons, selector switches, and key switches.
• Reading status from relay contacts, pressure switches, and float switches.
• Interfacing with safety door switches and mechanical limit switches.
• General-purpose status input for alarm and interlock circuits.

For wiring schematics or to order the Honeywell 900G01-0202, contact our technical support.

Contact: Email sales@nex-auto.com or WhatsApp +86 153 9242 9628.

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