TC-IDD321 Honeywell 24 VDC Discrete Input Module, TC-IDD321 32-Pt

Honeywell TC-IDD321 24 VDC 32-Point Discrete Input Module

The Honeywell TC-IDD321 is a 32-point discrete input module for 24 VDC control systems. It uses two groups of 16 points per common. Each channel offers programmable filtering from 0 ms to 18 ms. The card suits high-density cabinets where panel space is tight.

Why Buy From Oiltech Controls?

• More than 15 years of industrial automation spare parts sourcing
• Worldwide delivery through FedEx, UPS, and DHL
• Surplus and refurbished units are tested before listing
• Every module carries a 12-month warranty
• Technical checks run before each shipment leaves the warehouse
• Ongoing support for discontinued control platforms

Technical Specifications

• Model: TC-IDD321
• Inputs: 32 points, 16 points per common
• ON-State Voltage: 10 to 31.2 VDC at 60 °C, all channels
• Nominal Input: 24 VDC
• ON-State Current: 2 mA minimum
• OFF-State Voltage: 5 V maximum
• OFF-State Current: 1.5 mA maximum
• Isolation: 1500 VDC for 1 s, channel to channel
• Isolation: 1500 VDC for 1 s, user to system
• Off to On Delay: programmable 0 ms, 1 ms, or 2 ms
• Off to On Hardware Delay: 1 ms max plus filter time
• On to Off Delay: programmable 0 ms, 1 ms, 2 ms, 9 ms, or 18 ms
• On to Off Hardware Delay: 1 ms max plus filter time
• Power Dissipation: 6.1 W max
• Short/Inrush Current: 250 mA peak, decays below 37% in 22 ms
• Input Compatibility: IEC Type 1+
• Terminal Blocks: TC-TBCH, 36-position

Oiltech Controls Review

• The TC-IDD321 reads 32 discrete points in one slot. This density cuts rack space.
• Channel-to-channel isolation at 1500 VDC limits cross-talk between groups.
• Programmable delay up to 18 ms tames noisy field contacts.
• IEC Type 1+ compatibility matches most 24 VDC sensors and pushbuttons.
• Units ship within 24 to 28 hours after order confirmation.

Oiltech Controls Insight: Where It Fits

• High-density cabinets with limited DIN rail space
• Legacy Honeywell Series C I/O racks in retrofit projects
• Panel builders needing 32 points per card
• Systems using IEC Type 1+ sink sensors
• Plants replacing obsolete input cards without rewiring

Installation Notes

• Mount on a standard DIN rail inside the enclosure.
• Use TC-TBCH 36-position terminal blocks for field wiring.
• Keep external supply at 24 VDC nominal.
• Confirm ripple stays low to avoid false ON states.
• Check the 1500 VDC isolation rating against panel grounding.

Shipping and Warranty

• Dispatch in 24 to 28 hours after payment clears.
• Carriers: FedEx, UPS, and DHL.
• Each module includes a 12-month warranty.
• Tracking details go out at pickup.

FAQ

• Q: How many points share one common?
• A: 16 points per common, so the 32-point card uses two groups.
• Q: Can I filter noisy contacts in the field?
• A: Yes. Set On to Off delay up to 18 ms through the programmable filter.
• Q: Does it fit my existing Series C rack?
• A: It fits Series C racks that accept 32-point discrete input cards. Check the rack model first.
• Q: Should I choose this card or a 16-point module?
• A: Pick this card when panel space is tight. Pick 16-point cards when channel isolation matters more.
• Q: What usually causes false triggers on this card?
• A: High supply ripple and long unshielded runs. Lower ripple and separate signal from power cables.

Contact Oiltech Controls

• Email: info@oiltechcontrols.com
• WhatsApp: +86 158 8020 0923

Copyright © 2026 Oiltech Controls Limited. https://www.oiltechcontrols.com/ All rights reserved.
All rights reserved.