Honeywell MC-TDODI3 Digital Output Module

Output Architecture and Channel Design

This digital output module drives field actuators, solenoids, and indicator lamps directly from the control system. It features sixteen independent output channels with built-in short-circuit protection for each point. Every channel delivers 24 VDC at 0.5 A continuously without derating. The module also incorporates individual LED indicators for real-time output status monitoring. This configuration supports both high-side and low-side switching applications effectively.

Technical Specifications

Parameter	Specification
Model Number	MC-TDODI3
Output Channels	16 digital outputs
Output Voltage	24 VDC nominal (18–32 VDC range)
Output Current	0.5 A per channel (continuous)
Total Current	8 A maximum (all channels combined)
Load Type	Resistive, inductive, or lamp loads
Protection	Short-circuit and overcurrent per channel
Off-State Leakage	<0.1 mA
On-State Voltage Drop	<0.5 V at rated current
Switching Speed	1 ms typical (on/off transition)
Isolation	Optical isolation (channel-to-backplane)
Isolation Voltage	1500 VAC
Current Draw (Logic)	200 mA from backplane
Power Dissipation	6.0 W maximum (full load)
Operating Temperature	0°C to +60°C
Storage Temperature	–40°C to +85°C
Dimensions (H x W x D)	130 mm x 32 mm x 135 mm
Weight	Approximately 0.40 kg
Field Termination	40-pin ribbon cable connector
Output Indicators	16 red LEDs, one per channel

Protection and Diagnostic Features

Each output channel includes automatic overcurrent shutdown for fault protection. The module resets the affected channel automatically after clearing the fault condition. A watchdog timer monitors the backplane communication link continuously. This timer forces all outputs to a safe state upon communication loss. Diagnostic data flows through the system software for remote troubleshooting.

Field Wiring and Connection Guide

The MC-TDODI3 terminates field wiring through a 40-pin connector assembly. Use the mating cable harness to connect outputs to field devices directly. Each output channel provides two termination points: output signal and return ground. Connect inductive loads with external flyback diodes for voltage spike suppression. This practice protects the output transistors from damaging voltage transients.

Power Requirements and Energy Management

This module draws 200 mA from the 5 VDC logic supply via the backplane. The output power comes directly from the external 24 VDC field supply. Internal storage capacitors maintain output states during brief supply interruptions. Total power dissipation reaches 6.0 W under maximum load conditions. Allow adequate spacing between modules for proper heat dissipation.

Installation and Mounting Procedure

Insert the module into any standard Series T I/O chassis slot. Push firmly until the ejector tabs snap into the locked position. Secure the module using the top and bottom retaining screws. Connect the field wiring harness before energizing the system. Verify the power LED illuminates after applying system voltage.

Environmental Operating Conditions

This output module operates flawlessly in temperatures from 0°C to 60°C. It tolerates relative humidity levels between 5% and 95% non-condensing. The PCB features conformal coating for protection against dust and moisture. This construction suits industrial environments with moderate contamination levels. Ensure proper cabinet ventilation for reliable long-term operation.

Maintenance and Troubleshooting Tips

Monitor the channel LEDs to verify correct output activation during operation. Replace the module immediately if multiple outputs fail to respond. Check the external power supply voltage if all outputs remain inactive. Clean the connector pins carefully during routine maintenance procedures. Keep spare modules available for quick replacement during emergencies.