Description

The Honeywell TC-MDP081 (Part Number 51404351-125) is an 8-channel pulse input / 2-channel output module designed for high-speed counter and frequency processing within the Experion control platform. Operating as a dedicated I/O processing unit, it receives floating, optically isolated pulse signals to provide precise measurement of frequency, pulse length, and accumulated pulse counts. The Honeywell TC-MDP081 connects to the controller backplane and interface infrastructure to interface rotating machinery, flow meters, encoders, and other high-frequency field instrumentation directly into the Experion control architecture.

Featuring flexible signal range selection, the Honeywell TC-MDP081 handles pulse frequencies from 0 to 100 kHz across 8 input channels. Channels 0 through 5 are dedicated to frequency and pulse length evaluation, while channels 6 and 7 incorporate 32-bit hardware accumulators alongside discrete On/Off switching outputs based on target count values. Integrated optical isolation protects backplane electronics from field-side transients, delivering reliable performance in complex industrial automation environments.

Features

• High-Speed Signal Acquisition: Processes pulse input signals from 0 to 100 kHz across 8 independent input channels.
• Integrated Discrete Outputs: Features 2 optically isolated 500 mA outputs tied directly to channels 6 and 7 for automated target-count switching.
• Dual Voltage Range Thresholds: Configurable for Low Range (3.25 V transition threshold) or High Range (8.80 V transition threshold) input signals.
• Configurable Edge Detection: Software selectable triggering on either the leading (off-to-on) or trailing (on-to-off) pulse edge per channel.
• Multi-Function Channel Modes: Supports frequency, pulse length (high, low, or period measurement), and 32-bit accumulated pulse count values.
• Electrical Isolation: Provides 1500 VDC isolation between field terminal blocks and the system backplane, as well as channel-to-channel isolation.

Applications

• Flow Measurement: Reading high-frequency pulse trains from turbine, positive displacement, and Coriolis flowmeters.
• Turbine & Motor Speed Monitoring: Direct frequency acquisition for rotational speed measurement on motors, turbines, and drives.
• Batching & Totalization: Pulse accumulation and discrete target switching for accurate liquid or solid batch dispensing systems.
• Position & Distance Tracking: Interfacing linear or rotary encoder outputs to track mechanical displacement and totalized counts.

Technical Specifications

Installation Guidelines

1. Model & Part Verification: Confirm the physical module matches model number TC-MDP081 and part number 51404351-125 prior to insertion.
2. Power & Chassis De-Energization: Turn off rack power or observe proper hot-swap protocols according to your Experion system guidelines before inserting the module into the chassis.
3. Terminal Block Wiring: Wire external field signals to the 36-position TC-TBCH terminal block. Ensure signal polarities and shield ground lines conform to site noise mitigation standards.
4. Voltage Range Alignment: Verify that field sensor signal voltages match either the Low Range (approx. 3.25 V threshold) or High Range (approx. 8.80 V threshold) capabilities of the module.
5. Output Load Checking: Ensure external loads connected to the 2 output channels do not exceed the 500 mA current rating.

Configuration Recommendations

1. Channel Assignment: In the Control Builder environment, assign individual channels (0–5 for frequency/pulse length, 6–7 for accumulated counting).
2. Edge & Range Configuration: Set the trigger edge (leading or trailing) and input voltage threshold (High or Low) based on field pulse generator specifications.
3. Pulse Measurement Mode: For channels 0 through 5, select whether pulse length is evaluated on the high state, low state, or full period.
4. Target Value Setup: For channels 6 and 7, define the 32-bit target count values that trigger the corresponding 500 mA discrete outputs.
5. Parameter Backup: Save and export the system configuration file following parameter setup to maintain a complete software backup before commissioning.