TK-ODD321 | Honeywell | 32-Point Discrete Output Module

The Honeywell TK-ODD321 is a high-density 24 VDC discrete output module designed for process control platforms. It provides 32 solid-state output points organized into two isolated groups of 16 channels per common to drive field actuators, indicators, and relays.

Output Current Ratings and Thermal Derating

The module supports an output voltage operating range of 10 VDC to 31.2 VDC at 50 deg C and 10 VDC to 28 VDC at 60 deg C. Individual outputs handle up to 0.5 A per point at 50 deg C, linear derating to 0.35 A maximum at 60 deg C, with total module current capacity rated at 16 A at 50 deg C and 10 A at 60 deg C. Each channel tolerates a repeatable surge current of 1 A for 10 ms every 2 seconds at 60 deg C, while requiring a minimum on-state current load of 3.0 mA per point.

Logic States and Circuit Protection

Each output point supports configurable fault states and program mode states (Hold Last State, ON, or OFF, with OFF as default). The module has maximum on-to-off and off-to-on switching delay times of 1.0 ms. The outputs do not include internal fusing or reverse polarity protection; using a fused interface module (IFM) is recommended, as improper wiring will damage output circuitry.

Isolation and Interface Wiring

The module features robust galvanic isolation tested at 2,546 VDC for 1 second both between user-to-system circuits and group-to-group channels (250 VAC maximum continuous working voltage between groups). It dissipates 6.1 W of power under load and interfaces with field wiring via a TC-TBCH 36-position connection terminal block.

Technical Specifications

Frequently Asked Questions

Q: Does the TK-ODD321 module include internal fusing or reverse polarity protection?

A: No, the outputs are unprotected against reverse polarity and short circuits; connecting a fused interface module (IFM) is recommended to protect the output channels.

Q: How does operating temperature affect the current rating of the TK-ODD321 outputs?

A: The per-point rating derates linearly from 0.5 A maximum at 50 deg C down to 0.35 A maximum at 60 deg C, while total module capacity drops from 16 A to 10 A.

Q: What terminal block is required for field wiring connections?

A: The module requires a TC-TBCH 36-position terminal block for external field wiring connections.