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Product Overview
The Honeywell MU‑TDID72 (51303928‑100) is a 32‑point 24 V DC digital input Field Termination Assembly (FTA) used in Honeywell TPS/Process Manager systems. It collects on‑site digital signals—such as switches, sensors, or status devices—and relays them to the controller with optical/galvanic isolation, ensuring reliable monitoring and protection of industrial processes.
Key Features
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Supports up to 32 digital input channels at 24 VDC
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Optical isolation with 1500 VAC/±1500 VDC isolation between field and controller
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Fast sensing with ≤ 3.6 ms filter‑to‑logic response time
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Surge protection compliant with ANSI/IEEE C37.90.1‑1978
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Handles DC signals from 0 Hz up to 15 Hz (for pulse counting)
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Compact modules sized B or C with screw or compression connectors
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Rugged design suited for hazardous and industrial environments
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | MU‑TDID72 51303928‑100 |
| Channels | 32 digital inputs (24 VDC) |
| Input Voltage Range | 18–30 V DC |
| Sensitivity | ON ≥ 12 mA, OFF ≤ 4.3 mA |
| Response Time | ≤ 3.6 ms from filter to logic |
| Isolation | 1,500 VAC rms or ±1,500 VDC field‑to‑APM/HPM optical isolation |
| Surge Protection | ANSI/IEEE C37.90.1‑1978 |
| Input Frequency Capable | DC to 15 Hz (pulse counting) |
| Dimensions | 120 × 80 × 50 mm |
| Weight | 0.5 kg |
| Certifications | CE, RoHS (varies by distributor) |
| Country of Origin | USA |
Typical Applications
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Monitoring of field devices: switches, valves, pressure or level alarms
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Input for alarm/trip logic in TPS or DCS systems (Honeywell TPS, APM, HPM, EHPM)
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Event-counting input for status indicators or low-speed sensors
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Suitable for hazardous industrial zones due to galvanic isolation
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Ideal for retrofit and replacement in existing Honeywell input cabinets
Product Advantages
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Large Input Capacity: Supports 32 discrete 24 V signals per module, saving rack space
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High Isolation: 1500 VAC/DC isolation ensures field-to-cabinet safety and low noise
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Fast Response: Sub‑4 ms throughput suitable for control applications
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Rugged and Reliable: Surge-resistant and built for harsh environments
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Rapid Installation: Modular FTA design with screw and compression terminations
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System Compatibility: Integrates seamlessly with Honeywell TPS, APM/HPM modules
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Certified Build: Meets international EMC and environmental standards
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OEM Support: Honeywell heritage quality with worldwide technical support
Frequently Asked Questions (FAQ)
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How many inputs does it support?
32 digital input channels at 24 V DC. -
What isolation does it provide?
1,500 VAC rms or ±1,500 V DC optical/galvanic isolation between field and controller. -
What is the response time?
≤ 3.6 ms from input filter to logic level. -
Which voltages are supported?
Designed for 24 VDC nominal (range 18–30 V). -
Can it handle pulses?
Yes — supports DC to 15 Hz signals and event counting functions. -
What surge protection is included?
Meets ANSI/IEEE C37.90.1‑1978 surge withstand standards. -
What are the physical dimensions?
FTA size C max length ~462 mm (~18.2″) — consult FTA Table. -
Is it CE and RoHS certified?
Yes, per distributor data — varies by region. -
How is it mounted?
Mounted via standard DIN rails/channels using compression or screw terminals. -
What systems is it compatible with?
Honeywell TPS, Zeeeco, APM, HPM, and EHPM systems — intended for use with Honeywell I/O processors.
Recommended Related Models
| Model | Description |
|---|---|
| MU‑TDID12 51304441‑100 | 32‑channel 24 V DC Digital Input FTA, size C, screw termination |
| MU‑TDID52 51304441‑200 | 32‑channel 24 V DC Digital Input FTA, screw termination |
| MU‑TDIA72 51303930‑100 | 32‑channel 120 V AC Digital Input FTA, single IOP, size C |
| MU‑TDON12 51304446‑100 | 16‑channel 24 V DC Non‑isolated Digital Output FTA |
| MU‑TDOY22 80366183‑100 | 32‑channel 24 V DC Isolated Digital Output FTA |
| MU‑TAIH02 51304453‑100 | High-level analog input (FTA size B) |
Popular Honeywell I/O Field Modules
| Model | Description |
|---|---|
| MU‑TDIA12 | 32‑ch 120 V DC Input FTA for high-voltage field signals |
| MU‑TDOD12 | 16‑ch Digital Output 24 V FTA |
| MU‑TAOX02 | 8‑ch Analog Output FTA |
| MU‑TAIH02 | 16‑ch High-level Analog Input FTA |
| MU‑TSTX03 | 16‑ch Temperature Sensor Interface FTA |
| MU‑TDOD62 | 24 V DC Digital Output FTA with redundancy options |
