Honeywell CC-TDI220
Honeywell CC-TDI220
Honeywell CC-TDI220

Honeywell 8C-TDIL01 | C300 Series Isolated Digital Input Unit for DCS/SIS

  • Brand: Honeywell
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    Model: 8C-TDIL01
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    Product Type: Digital Input Module
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    Series: Experion PKS C300 (Distributed Control System I/O)
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    Core Function: Provides 8 isolated digital input channels to acquire signals from field devices (e.g., limit switches, valve status sensors, emergency stops) and transmit them to C300 controllers for process monitoring and safety interlocks.
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    Key Specs: 8 channels, 24V DC input voltage, dry/wet contact support, 2500VAC isolation, ±0.1% accuracy, -40°C to +70°C operating temperature, hot-swappable design.
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Manufacturer:
Part number: Honeywell 8C-TDIL01
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Description

8C-TDIL01: Product Overview
The 8C-TDIL01 is an 8-channel digital input module designed for integration into Honeywell’s Experion PKS C300 distributed control system (DCS) and safety instrumented systems (SIS). It serves as a front-end interface for acquiring discrete signals from field-mounted devices, converting physical contact closures (dry) or voltage levels (wet) into digital data for controller processing. Its primary role is to enable reliable monitoring of process-critical and safety-critical states—such as valve positions, equipment status, or emergency stop activations—in industries where signal integrity and uptime are essential.
Functionally, the module processes inputs from 8 independent channels, each configurable for dry contact (relay) or wet contact (24V DC) signals. It employs galvanic isolation (2500VAC) to prevent ground loops and electromagnetic interference (EMI) from corrupting data, a critical feature in electrically noisy industrial environments. As part of the C300 I/O family, the 8C-TDIL01 integrates with the platform’s high-speed I/O link, hot-swappable architecture, and unified engineering tools (ControlEdge Builder), simplifying configuration and maintenance. This design aligns with applications requiring compliance to IEC 61508 (SIL 2) and adherence to standards like API 556 (refinery instrumentation) or NFPA 79 (machine safety).

Honeywell CC-TDI220

Honeywell CC-TDI220

8C-TDIL01: Technical Specifications
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    Model Number: 8C-TDIL01
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    Manufacturer: Honeywell
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    Product Type: Digital Input Module
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    Number of Channels: 8 (individually isolated)
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    Input Type: Dry contact (relay), wet contact (24V DC)
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    Input Voltage (Wet Contact): 24V DC nominal (18-30V DC range)
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    Isolation Voltage: 2500VAC (channel-to-channel, channel-to-bus)
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    Signal Detection: Logic low <5V DC, logic high >15V DC (wet contact)
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    Accuracy: ±0.1% (signal detection threshold)
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    Response Time: <10 ms (typical, from input change to controller update)
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    Power Supply: 24V DC (nominal, 18-30V DC range) from C300 chassis
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    Power Consumption: 1.8W (typical, all channels active)
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    Operating Temperature: -40°C to +70°C
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    Humidity Range: 5% to 95% non-condensing
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    Certifications: SIL 2 (IEC 61508), CE, UL, ATEX Zone 2 (optional)
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    Dimensions: 25mm x 128mm x 115mm (width x height x depth, fits C300 I/O slot)
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    Weight: 0.2kg
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    Diagnostics: Channel status (open/short circuit), power monitoring, communication heartbeat
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    Hot Swap Support: Yes (plug-and-play replacement without system shutdown)
Core Features & Customer Value​
Compact Channel Density for Space-Constrained Cabinets: With 8 input channels per module, the 8C-TDIL01 balances channel count with compact form factor (25mm width), ideal for control cabinets with limited space. For engineers designing small-scale systems (e.g., a standalone compressor skid), this reduces module count by 50% compared to 16-channel alternatives, simplifying wiring and material costs.
Galvanic Isolation Ensures Reliable Signal Integrity: The 2500VAC isolation between channels and the C300 bus prevents ground loops and EMI from industrial equipment (e.g., motors, drives) from distorting input signals. In a chemical plant’s pump monitoring system, this ensures accurate detection of pump status switches—critical for preventing dry-running—even near high-power agitators.
Built-In Diagnostics Accelerate Troubleshooting: The module monitors each channel for open circuits (broken wires), short circuits (to ground/power), and power supply health. Faults are reported to the C300 controller via I/O link, with LED indicators on the faceplate for quick visual identification. For maintenance teams, this reduces diagnostic time from hours to minutes—e.g., identifying a faulty valve position switch in a power plant’s feedwater system without invasive testing.
Hot-Swappable Design Minimizes Downtime: The module can be replaced while the system remains powered, a critical feature for continuous processes like oil refining or water treatment. Technicians simply remove the faulty module and insert a new one; the C300 controller automatically reloads configuration data via I/O link. This eliminates scheduled shutdowns for module replacement, saving thousands in lost production per incident.
SIL 2 Certification for Safety-Critical Applications: When integrated into a Honeywell Safety Manager SIS, the 8C-TDIL01 meets SIL 2 requirements (IEC 61508), enabling its use in safety functions like emergency shutdown (ESD) or equipment interlocks. Its fault-tolerant design (hardware fault tolerance ≥1) reduces the probability of dangerous failures, aligning with audit requirements for regulated industries.

Honeywell CC-TDI220

Honeywell CC-TDI220

Typical Applications​
The 8C-TDIL01 is deployed in systems requiring reliable digital input acquisition. In a petroleum refinery’s hydrotreater unit, it connects 8 safety devices: 4 emergency stop buttons (dry contact), 2 valve position switches (dry contact), and 2 flame detector status inputs (wet contact). The module’s SIL 2 certification ensures compliance with API 556, while hot-swap capability allows maintenance during planned turnarounds without halting production.
At a chemical plant’s blending skid, the 8C-TDIL01 monitors 8 process interlocks: 4 agitator status switches (dry contact), 2 temperature limit switches (dry contact), and 2 pressure relief valve sensors (wet contact). Its 2500VAC isolation prevents EMI from nearby mixers from causing false trips, ensuring consistent blend quality.
In a municipal water treatment plant, the module interfaces with 8 pump status switches (dry contact) and 2 valve position sensors (wet contact) at a remote booster station. The C300 controller uses these inputs to trigger alarms or activate backups, with diagnostics alerting staff to a failed switch before service disruption.
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