Model Correction
The model string 8C-TAIX51 does not correspond to the item shown in the image. The PCB is clearly marked Honeywell 8C-TDOD51, with the associated reference 51306979-175. It is a Honeywell Experion Series C redundant digital output module, not a digital input module. Correct identification is essential because 8C-TDOD51, 8C-TDID51, and 8C-TDIX51 are different module types and are not interchangeable.
SEO-Optimized Titles
- Honeywell 8C-TDOD51 51306979-175 Redundant Digital Output Module
- Honeywell 8C-TDOD51 Series C 16-Channel 24 VDC Digital Output
- Honeywell 8C-TDOD51 51306979-175 Experion PKS Output Module
- Honeywell 8C-TDOD51 Redundant DO Module for C300 Controller
- Honeywell 8C-TDOD51 16-Point Sink/Source Digital Output Module
- Honeywell 8C-TDOD51 51306979-175 Fault-Tolerant Digital Output
- Honeywell 8C-TDOD51 Series C IOTA-Terminated Output Module
- Honeywell 8C-TDOD51 24 VDC 0.5 A per Channel Output Module
- Honeywell 8C-TDOD51 51306979-175 DCS Spare Part
- Honeywell 8C-TDOD51 Redundant Digital Output for Safety and Critical Control
Product Overview
The Honeywell 8C-TDOD51 (51306979-175) is a redundant digital output module for the Honeywell Experion Series C control platform. It installs in a Series C input/output terminal assembly, or IOTA, and works with redundant controller and I/O configurations to maintain deterministic on/off control during a module, power, or communication failure. Rather than merely switching a discrete load, the Honeywell 8C-TDOD51 provides fault-tolerant, bidirectional DC output capability that is integrated with Experion process control and asset-management functions.
The module provides 16 isolated digital output channels. Each channel can operate as a current-sinking or current-sourcing output at 24 VDC, with a rated load current of 0.5 A. Output states are determined by the control application and transmitted through the redundant Series C communication and backplane architecture. Diagnostic information, module health, and output status are visible to the control system, which supports predictive maintenance and faster fault isolation.
The Honeywell 8C-TDOD51 51306979-175 is especially valuable in continuous-process industries where an unexpected loss of a solenoid, valve, pump starter, alarm, or interlock output can create safety, environmental, or production consequences. Used with redundant Series C I/O and controllers, it helps maintain the control action associated with the configured output state. Because the module is now obsolete, verified spares, correct IOTA terminations, and compatible firmware are critical to successful replacement.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | 8C- |
| Part/Order Reference | 51306979-175 |
| Manufacturer | Honeywell International Inc. |
| Product Type | Redundant digital output module |
| Control Platform | Honeywell Experion Series C |
| Compatible Controllers | Redundant C300 controller |
| Output Channels | 16, electrically isolated |
| Output Voltage | 24 VDC nominal |
| Output Configuration | Sink or source, jumper/configurable |
| Rated Load Current | 0.5 A per channel |
| Module Power | 24 VDC from IOTA |
| Module Power Consumption | 12 W |
| On-State Voltage Drop | Less than 1.0 V |
| Off-State Leakage Current | Less than 1.0 mA |
| Turn-On/Turn-Off Time | Less than 1.0 ms |
| Communication | Redundant Series C I/O bus |
| Redundancy | Redundant output pair / redundant I/O architecture |
| Diagnostics | Open circuit, short circuit, overcurrent, overtemperature, internal fault, module health |
| Isolation | Channel-to-channel and field-to-logic isolation |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5% to 95%, non-condensing |
| Enclosure Rating | IP20, cabinet-mounted |
| Compliance | CE, RoHS; cULus Class I Division 2, ATEX, IECEx where marked |
