Honeywell 8C-TDILA1 Digital Input Termination Assembly
The Honeywell 8C-TDILA1 is a 24 VDC non-redundant, conformally coated Input Output Termination Assembly (IOTA) designed for Honeywell Experion PKS Series 8 DCS systems. It serves as the physical field wiring interface for the 8C-PDILA1 digital input module, enabling reliable discrete signal collection from proximity switches, pushbuttons, relays, and contact-based field instruments.
Channel Functionality and Signal Isolation
The assembly supports 32 digital input channels operating within a 24 VDC nominal range (18–30 VDC). Channels 1–16 are configurable for pulse accumulation and frequency measurement, while channels 17–32 operate as standard discrete inputs. The system incorporates optical isolation and galvanic isolation rated at 1000 VAC RMS or ±1500 VDC to safeguard control electronics against severe electrical noise.
Electrical Characteristics and Enclosure
Featuring a 9-inch (228.6 mm) compact footprint with conformal coating against airborne contaminants, the unit mounts on standard DIN rails inside control cabinets. It operates across an extended ambient temperature range of –40 deg C to +70 deg C with an input impedance of 4.2 kΩ and an input filter delay of 5 ms ±20%.
| Parameter | Specification |
|---|---|
| Brand | Honeywell |
| Model | 8C-TDILA1 |
| Product Type | Digital Input Termination Assembly (IOTA) |
| Product Series | Honeywell Series 8 |
| Compatible System | Experion PKS |
| Compatible I/O Module | 8C-PDILA1 |
| Number of Channels | 32 |
| Channel Allocation | Channels 1–16 (Pulse/Frequency), Channels 17–32 (Standard DI) |
| Nominal Voltage | 24 VDC |
| DI Power Voltage Range | 18–30 VDC |
| Input ON Threshold | 13 VDC min. / 3 mA min. |
| Input OFF Threshold | 5 VDC max. / 1.2 mA max. |
| Input Impedance | 4.2 kΩ |
| Module Current Rating | 95 mA |
| Filter / Isolation Delay | 5 ms ±20% |
| Galvanic Isolation | 1000 VAC RMS / ±1500 VDC |
| Coating | Conformal Coated |
| Configuration | Non-Redundant |
| IOTA Size | 9 inches (228.6 mm) |
| Mounting | DIN Rail |
| Operating Temperature | –40 deg C to +70 deg C |
Frequently Asked Questions
Q: Which digital input module works directly with the 8C-TDILA1 termination assembly? A: It is engineered specifically as the field wiring termination base for the Honeywell 8C-PDILA1 digital input module.
Q: How are the 32 input channels configured on this assembly? A: Channels 1–16 can be configured for pulse accumulation and frequency counting, while channels 17–32 function as standard 24 VDC discrete inputs.
Q: What input switching thresholds apply to the discrete input loops? A: Logic ON requires a minimum of 13 VDC or 3 mA, whereas logic OFF occurs at 5 VDC maximum or 1.2 mA maximum.
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| Warranty | 12 Months |
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