Overview
Configured for 24 VDC digital output signal switching in the Honeywell Experion PKS Series C platform, the Honeywell DC-TDOB11 (CC-TDOB11 Digital Output IOTA) provides direct electrical execution for field output circuits. The assembly interfaces controller output channels with external devices through a bussed 24 VDC architecture, supporting 32 output channels, redundant installation, and individual electronic channel protection against over-current and short-circuit conditions.
Suffix Breakdown & Model Matrix
The available information identifies the following hardware references. No additional suffix decoding is specified by the manufacturer.
| Model | Description |
|---|---|
| DC-TDOB11 | Digital Output Input/Output Termination Assembly (IOTA) |
| CC-TDOB11 | Associated Digital Output Module used with the IOTA assembly |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | DC-TDOB11 |
| Brand | Honeywell |
| Origin | USA |
| Weight | Approx. 0.45 kg (module); approx. 1.6 kg (assembly) |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Not specified |
| System Compatibility | Honeywell Experion PKS Series C DCS |
| Module Type | Digital Output IOTA |
| I/O Type | DO-24B Bussed Digital Output |
| Output Channels | 32 |
| Nominal Output Voltage | 24 VDC |
| Output Configuration | Source output, 0.5 A per channel |
| Response Time | Less than 1 ms |
| Redundancy | Supported |
| Channel Protection | Electronic short-circuit and over-current detection |
| Storage Temperature | -40 to 85 deg C |
| Relative Humidity | 5 % to 95 % non-condensing |
| Hazardous Area Certification | Class I Division 2 Groups A, B, C, D; T4 |
| Additional Certification | ATEX / IECEx Ex ec nA IIC T4 Gc |
| Enclosure Rating | IP20 |
Channel-to-Channel Isolation Considerations
The DC-TDOB11 is designed for distributed digital output operation within the Series C architecture, where field wiring is terminated through the IOTA while output logic resides on the associated module. Individual electronic protection monitors each output channel independently. When the output current exceeds approximately 0.5 A because of a field short circuit, the affected channel is disabled while unaffected channels continue operating. This protection mechanism reduces the impact of a single field wiring fault on the remaining digital outputs in the assembly.
Frequently Asked Questions
Q: Does the DC-TDOB11 support redundant installations?
A: Yes. The assembly is designed for redundant IOTA configurations within compatible Honeywell Experion PKS Series C systems.
Q: What occurs if an output channel is short-circuited?
A: Electronic protection detects excessive output current. The affected channel is disabled and transitions to manual status while the remaining output channels continue operating.
Q: Is the output voltage generated internally by the module?
A: The assembly distributes bussed 24 VDC to field output circuits. Output operation depends on the associated system power architecture and controller configuration.
Field Installation Guidelines
- Verify the module and IOTA part numbers before installation to ensure compatibility with the installed Series C chassis.
- Remove field power before connecting or disconnecting field wiring unless the installation procedure specifically permits maintenance under power.
- Route digital output wiring separately from high-voltage and variable-frequency drive cables to reduce electrical interference.
- Terminate cable shields according to the site’s grounding standard to minimize conducted noise.
- Confirm output load current does not exceed the specified 0.5 A limit for each output channel.
- After installation, perform channel verification through the control system before placing connected field equipment into service.
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