32-Channel 24VDC Digital Input Module | Honeywell TC-IDD321
Manufacturer: Honeywell
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Part Number: TC-IDD321
Condition：New with Original Package
Product Type: Digital Input Modules
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Honeywell TC-IDD321 Experion LS Digital Input Module
The Honeywell TC-IDD321 is a 32-channel, 24 VDC digital input module designed for Honeywell Experion LS control platforms. Installed in a Series A I/O chassis, it interfaces discrete field signals—such as limit switches, relay contacts, and push buttons—into digital status data for real-time process monitoring and system interlocks.
Input Configuration and Filtering Characteristics
The module features a high-density 32-channel layout arranged into two isolated groups of 16 points per common. Inputs operate at a nominal 24 VDC voltage (10 to 31.2 VDC on-state range at 60 deg C) with IEC Type 1+ input compatibility. To mitigate electrical noise and signal bounce in field wiring, hardware input filters are individually configurable for OFF-to-ON transition delays (0, 1, or 2 ms) and ON-to-OFF transition delays (0, 1, 2, 9, or 18 ms), supplemented by a maximum hardware input delay of 1 ms.
Electrical Isolation and Wiring Interface
Designed to prevent ground loops and protect internal system logic, the TC-IDD321 provides 1500 VDC electrical isolation between user field wiring and the system backplane, as well as between input channels. Field connections are made using a 36-position TC-TBNH terminal block. The unit consumes up to 6.1 W of power under full load conditions and handles peak inrush currents up to 250 mA.
| Parameter | Specification |
|---|---|
| Model | TC-IDD321 |
| Brand | Honeywell |
| Product Type | Digital Input Module |
| Product Series | Experion LS / Series A I/O |
| Number of Inputs | 32 channels (16 points per common) |
| Nominal Input Voltage | 24 VDC |
| On-State Voltage Range | 10 – 31.2 VDC @ 60 deg C |
| Minimum On-State Current | 2 mA |
| Maximum Off-State Voltage | 5 V |
| Maximum Off-State Current | 1.5 mA |
| Input Compatibility | IEC Type 1+ |
| Off to On Filter Delay | Configurable: 0, 1, or 2 ms |
| On to Off Filter Delay | Configurable: 0, 1, 2, 9, or 18 ms |
| Hardware Input Delay | Max. 1 ms (plus configured filter time) |
| Isolation Voltage | 1500 VDC for 1 second (Channel-to-Channel & User-to-System) |
| Maximum Power Dissipation | 6.1 W |
| Inrush Current | 250 mA peak (decaying below 37% within 22 ms) |
| Terminal Block | 36-position TC-TBNH |
| Mounting Type | Honeywell Series A I/O chassis |
Frequently Asked Questions
Q: What terminal block model is compatible with the Honeywell TC-IDD321 digital input module?
A: The module connects to field cabling using the 36-position Honeywell TC-TBNH terminal block.
Q: How are the 32 channels on the TC-IDD321 structured for wiring commons?
A: The 32 channels are split into two groups, with 16 input points sharing a common reference per group.
Q: What configurable filter options exist to suppress field contact bounce on this module?
A: Users can configure OFF-to-ON filter delays to 0, 1, or 2 ms, and ON-to-OFF filter delays to 0, 1, 2, 9, or 18 ms, in addition to the base 1 ms hardware delay.