Honeywell TC-ODD321 Digital Output Module

Core Technical Specifications

The TC-ODD321 digital output module provides thirty-two independent solid-state outputs for discrete control applications. This unit measures 180 millimeters in height, 40 millimeters in width, and 160 millimeters in depth, with a total weight of approximately 0.55 kilograms. Each output channel delivers a maximum load current of 1 ampere at 24 volts DC with integrated short-circuit protection. The module includes built-in diagnostic feedback for each channel to verify proper load activation.

Output Performance and Protection Features

The TC-ODD321 updates all output states within a rapid 2-millisecond scan cycle for responsive control. Each channel includes independent short-circuit protection that limits current to 1.5 amperes maximum. The module also features thermal shutdown that activates when junction temperatures exceed safe limits. It provides per-channel diagnostic readback to confirm that loads receive the correct drive signal. This readback capability enables the controller to detect wiring faults or failed actuators immediately.

Physical Installation and Connectivity

You can install this module into any standard Honeywell Series C backplane using its single-slot design. Its front panel incorporates a 50-pin connector for all field output wiring terminations. The unit’s 40-millimeter width allows dense channel packing in control cabinets with limited space. LED indicators display power, output activation, and diagnostic status for each channel group. The module’s rugged housing meets IP20 protection standards for indoor industrial environments.

Memory Resources and Data Handling

The TC-ODD321 stores output state data and diagnostic information in 2 kilobytes of internal dual-port RAM. It retains configuration settings and default states in 1 kilobyte of non-volatile EEPROM memory. This module maps each output and its associated diagnostic bit to specific addresses in the I/O table. It automatically reports any output mismatch between commanded state and actual status. The unit also maintains a fault log for the last ten detected error events.

Power Distribution and Environmental Tolerance

This module draws a typical current of 180 milliamperes from the 5-volt DC backplane supply. It requires an external 24-volt DC field power source rated at a minimum of 1.5 amperes. The TC-ODD321 operates reliably across a temperature range of -20 to 70 degrees Celsius. It withstands humidity levels from 5% to 95% without condensation. The unit’s photocoupler isolation withstands 1500 volts between the field outputs and the logic bus.

Configuration and Diagnostic Flexibility

You can enable or disable individual output channels through simple software configuration commands. The module supports both continuous and pulsed output modes for various load types. It provides programmable output delays ranging from 0.1 to 10 milliseconds per channel. You can also configure safe-state values for each output in case of communication loss. This feature ensures predictable fail-safe behavior without requiring external hardware intervention.