Honeywell CC-TDOB11 51308373-175 32-Channel 24VDC Redundant Digital Output IOTA Module

Product Overview

The Honeywell 51308373-175, commercially designated as the CC-TDOB11, is a 32-channel, 24 VDC Digital Output IOTA (Input/Output Termination Assembly) module belonging to the Honeywell Experion PKS Series C I/O family. Designed for seamless integration with C200 and C300 controllers, it forms the critical field-side termination and output drive stage for discrete control signals within a distributed control system. In the classic Series C architecture, the CC-TDOB11​ functions as the redundant, bussed-output IOTA, paired with a compatible digital output electronics module such as the CC-PDOB01; together they deliver controlled 24 VDC power to field actuators including solenoid valves, motor contactors, relays, pilot lights, and pneumatic positioners.

The module’s core value lies in its combination of high channel density, fault tolerance, and safety-conscious behavior. Each of the 32 output channels can source up to 0.5 A, with aggregate limits of 4 A per 8-channel group and 6 A per module, allowing a single compact assembly to manage an entire bank of field devices. Because it is a bussed-output design, field power is distributed efficiently through the IOTA, simplifying cabinet wiring and marshalling. Galvanic isolation rated at 1500 VAC RMS (or ±1500 VDC) separates the field wiring from the sensitive system backplane, protecting the controller from ground loops, voltage transients, and electrical noise.

What truly distinguishes the Honeywell 51308303-175​ in demanding applications is its redundant IOTA architecture. Two modules can be configured side-by-side so that, in the event of a primary-side failure, the secondary takes over output control with zero switchover gap (0 ms)—a capability often described as bumpless or seamless failover. Complemented by fuse-less short-circuit protection, per-channel diagnostics, and configurable FAILOPT safe-state behavior, the Honeywell 51308373-175​ is engineered for process industries where unplanned downtime or unintended actuator movement is simply not acceptable.