Honeywell TC-FID321 Digital Input Module

Honeywell TC-FID321 Digital Input Module

Product Introduction

The TC-FID321 forms part of Honeywell's TC Series of industrial I/O modules. It provides thirty-two sinking digital input channels arranged in two groups of sixteen. Each group operates without isolation between its individual channels. Engineers choose this module for high-density discrete signal acquisition in process and factory automation. Typical uses include monitoring limit switches, pushbuttons, relay contacts, and proximity sensors. The DIN-rail mounting design simplifies panel layout and reduces installation effort.

Electrical Specifications

The TC-FID321 operates from an external dc supply ranging from 19.2Vdc to 31.2Vdc, including 5% ac ripple. ON-state voltage spans 19.2Vdc minimum to 31.2Vdc maximum, with 24Vdc nominal. Meanwhile, ON-state current measures 2mA minimum, 4.1mA nominal at 24Vdc, and 6.0mA maximum. OFF-state voltage stays at 5.0Vdc maximum, and OFF-state current reaches 1.5mA minimum. Additionally, input impedance is rated at 6.0K ohms. Isolation voltage is tested at 2121Vdc for two seconds between user and system circuits. However, no isolation exists between individual channels.

Filter and Conversion Performance

Users select OFF-to-ON and ON-to-OFF filter times from eight options: 0.25ms, 0.5ms, 1ms, 2ms, 4ms, 8ms, 16ms, and 32ms. The default filter time is 0.25ms. Specifically, shorter filter times suit high-speed counting tasks, while longer settings reject contact bounce and electrical noise. Flexbus current draw is 25mA at 5Vdc. Power dissipation reaches 6.0W at 31.2Vdc, which corresponds to 20.5 BTU/hr thermal dissipation. Thirty-two yellow channel status indicators give technicians immediate visual confirmation of each input state.

Mechanical and Environmental Parameters

The module measures 94mm in height, 94mm in width, and 69mm in depth. It accepts 12 gauge (4mm²) stranded conductors with 1.2mm maximum insulation and a 75°C or higher temperature rating. Terminal screw torque should fall between 4 and 7 inch-pounds. Operating temperature ranges from 0°C to 55°C, while storage extends from -40°C to 85°C. Humidity tolerance covers 5% to 95% non-condensing. Furthermore, the unit withstands 30g operating shock and 50g non-operating shock. Vibration resistance is tested at 5g over 10-500Hz per IEC 68-2-6.

Installation Guide

First, snap the TC-FID321 onto a standard DIN rail inside the control cabinet. Next, wire the external 24Vdc supply and field devices to the terminal blocks. Confirm that each input channel receives a sinking signal referenced to the correct common. Additionally, set the filter time in the configuration software to match your signal characteristics. Finally, tighten terminal screws to 4-7 inch-pounds and verify the yellow status indicators after power-up.

Packaging List

• 1 x Honeywell TC-FID321 Digital Input Module

• 1 x Anti-static protective bag

• 1 x Carton packaging

FAQ

Q1: What input voltage range does the TC-FID321 support?
A: The module accepts 19.2Vdc to 31.2Vdc externally, with 24Vdc nominal. ON-state threshold requires at least 19.2Vdc for reliable detection.

Q2: Can I adjust the input filter time?
A: Yes. You can select from eight filter times between 0.25ms and 32ms for both OFF-to-ON and ON-to-OFF transitions. The factory default is 0.25ms.

Q3: Are the 32 channels individually isolated?
A: No. Channels are grouped in two sets of sixteen, and no isolation exists between individual channels. Only user-to-system isolation is provided at 2121Vdc.

Q4: What is the input impedance of each channel?
A: Each channel presents 6.0K ohms input impedance. This value ensures predictable current draw from field devices at 24Vdc.

Q5: How do you ship the TC-FID321?
A: We ship via Fedex, UPS, and DHL. In-stock units usually dispatch within 3 business days after payment confirmation.