Features:
- 24V DC bussed outputs; supports latched, pulsed, and PWM modes; 9‑inch IOTA form factor.
- Per‑channel configurable: Hold Last Value or Shed to Safe Value; prevents dangerous output states during communication or system faults.
- When using external 24V supply, outputs are isolated from Series 8 power system; eliminates ground loops and protects controller electronics.
The 8C-TDOD51 packs 32 digital output channels into a compact 9‑inch IOTA form factor. This high density is a significant advantage for PlantCruise by Experion systems where rack space is limited. Each output provides 24V DC bussed power – all outputs share a common return, simplifying field wiring. The module supports three output modes: latched (standard on/off), pulsed (time‑limited activation), and pulse‑width modulated (PWM) for proportional control of devices like solenoid valves or heating elements. The bussed design means that a single field power source feeds all 32 outputs, reducing the number of field power wires compared to isolated output modules.
The 8C-TDOD51 addresses a critical safety concern: what happens to outputs when the controller loses communication or detects a system fault? Without proper handling, outputs might freeze in their last state, potentially causing dangerous conditions. The module implements FAILOPT (fail‑safe option) on a per‑channel basis. For each of the 32 outputs, the engineer can configure the safe‑state behavior as either HOLD LAST VALUE or SHED TO SAFE VALUE. Hold Last Value keeps the output at its most recent commanded state until communication is restored. Shed to Safe Value forces the output to a predetermined safe value (user‑configurable, e.g., "off" for a valve or "on" for a safety brake). This feature is essential for safety‑related applications such as emergency shutdown systems, burner management, or chemical dosing.
The 8C-TDOD51 offers flexible field power options that directly impact system reliability and noise immunity. The bussed outputs can be powered either from the Series 8 system power supply or from an external 24V DC source. The choice is made via a wiring option on the IOTA. When an external field power supply is used, the module provides galvanic isolation between the field outputs and the Series 8 power system. This isolation is critical in industrial environments where field wiring runs long distances, shares conduits with high‑power cables, or connects to devices on different ground potentials. Without isolation, ground loops can inject noise into the controller, causing erratic behavior or damage.
The 8C-TDOD51 Honeywell Digital Output module may still be available for purchase and support from Apter Power beyond
End-Of-Life (EOL)by the manufacturer (OEM).
Honeywell 8C-TDOD51 Digital Output module Manuals,
Datasheets,Drivers,Link
Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not
included with this equipment unless listed in the above stock item description.All prices are
shown in USD.
Honeywell 8C-TDOD51 Digital Output module Specs
General
- Manufacturer Honeywell
- Model 8C-TDOD51
- Condition New Original ready stock
- Product Family
8U-TDOD51,8C-TDOD61,8U-TDOD61
Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not
included with this equipment unless listed in the above stock item description.All prices are
shown in USD.
- Industrial Automation: Used for the logical control of production lines, machine operation, and various automated equipment.
- Building Automation: Integrated into intelligent building systems, responsible for the start-up and shutdown control of lighting switches, air conditioning, communication, and ventilation systems.
- Energy Management and Environmental Protection: Applied to boiler room control, waste treatment plants, and industrial gas process control.
- Field Equipment Drives: Directly controls field actuators such as solenoids, relays, indicator lights, and motor starters.
- Environmental Protection: The prefix "8C" indicates the presence of a Conformal Coating, effectively protecting against moisture, dust, and corrosive chemical gases.
- Humidity and Shock Resistance: Supports relative humidity from 5% to 95% (non-condensing) and is shock and vibration resistant.
- Channel Specifications: Typically supports 8 channels (dry contact relay type) or expandable to 32 channels (source output type).
- Diagnostic Feedback: Each channel is equipped with an LED status indicator to monitor the channel's ON status in real time, simplifying on-site troubleshooting.
- Fail-safe Mode: Supports configuration of the FAILOPT parameter. When controller communication is interrupted, the output can be set to "Hold Last Value" or automatically switch to the default "Safe Value".
- Software Integration: Configured via the Control Builder graphical tool, supporting multiple output modes (such as Latch, Pulse, PWM pulse width modulation).
- Short Circuit and Overload Protection: Features electronic current limiting and short circuit protection; some versions also include fuse isolation to protect the system baseboard from on-site faults.