HEM3801C Harsh-Environment I/O Module
HEM3801C is an intelligent, distributed I/O module designed for harsh‑environment applications. It integrates up to 38 flexibly configurable input/output channels, supporting voltage, current, and resistance measurements, as well as digital and PWM outputs. Featuring a rugged, durable plastic top housing and an aluminum alloy bottom housing, it meets IP67 protection standards and operates reliably across an extreme temperature range of –40°C to 85°C.
The module is equipped with a single CAN 2.0B communication interface, supports injection-molded wire harness systems, and is suitable for outdoor construction machinery, agricultural equipment, and industrial automation applications that demand high reliability, vibration and shock resistance, and robust electromagnetic compatibility.
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IO module
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1. Product Overview and Positioning
HEM3801C is a high-performance distributed control module designed for industrial and outdoor applications subject to vibration, wide temperature variations, high humidity, and complex electromagnetic environments. It provides equipment manufacturers with an integrated remote-node solution that combines signal acquisition, logic processing, and control output. Featuring standardized automotive‑grade connectivity and a rugged design, it simplifies system wiring while enhancing the overall reliability and environmental robustness of the control system.
2. Core Features and Performance Specifications
2.1 Powerful Signal Channel Capability
The module provides a total of 38 input/output channels, which can be dynamically configured to meet specific requirements, supporting up to 16 inputs or 26 outputs.
All analog inputs feature 12-bit resolution and deliver high accuracy. Taking the critical AIU channel as an example: the sampling accuracy is 2% when the input voltage is ≤ 0.5 V, and 1% for voltages between > 0.5 V and 32 V; both linearity and repeatability are rated at 1%.
2.2 Harsh-Environment Adaptability and Reliability Design
Structure and Protection:
Housing material: The design combines a plastic top shell with an aluminum alloy bottom shell, balancing electrical insulation, lightweight construction, and heat dissipation. Overall dimensions are 162 mm (width) × 96 mm (depth) × 40 mm (height).
Protection Rating: When used with AMP-series connectors and properly sealed, the entire unit achieves an IP67 rating, effectively preventing dust ingress and brief immersion.
Environmental Tolerance:
Wide-Temperature Operation: Both the operating and storage temperature ranges span from –40°C to +85°C, ensuring reliable performance in extreme cold and scorching heat.
Electromagnetic Compatibility: Adhering strictly to national standards, the product has successfully passed a series of rigorous tests—including electrostatic discharge immunity, electrical fast transient/burst immunity, and surge (impact) immunity—compliant with the GB/T 17626 series, thereby ensuring stable operation even in the presence of complex electromagnetic interference.
Mechanical Durability: It has passed the low‑temperature, high‑temperature, impact, and vibration tests specified in the GB/T 2423 series, ensuring reliable performance under severe mechanical stress.
2.3 Communications and System Configuration
Main Control Core: Employs a 32-bit Cortex-M4 processor with a clock speed of 120 MHz, delivering robust computational performance.
Communication Interface: Integrated one CAN 2.0B interface.
Baud rate: Adjustable from 20 kBit/s to 1 MBit/s, with a default setting of 250 kBit/s.
Communication Protocol: Adopts a proprietary extended-frame protocol and supports network node management.
Node ID: The default ID is 0x10, and it can be set within the range of 0x10 to 0x17.
Status Indication: The module is equipped with a four‑color LED indicator that provides an intuitive display of the operating status (green flashing indicates normal operation; solid green indicates a critical error), power status, and communication status (green flashing indicates a communication error).
2.4 Electrical and Load Characteristics
Power Supply: Supports a wide-range DC input of 8–32 VDC, making it suitable for applications with significant power supply fluctuations, such as engineering vehicles.
Typical no-load power consumption: Under 24 VDC and 25°C conditions, the current draw is approximately 100 mA.
Load Power Supply: The module is equipped with a dedicated load power supply input terminal (UBB) to supply power to the output channels.
Output Capability: Digital High‑Effective Output (DOH) and PWM output on selected channels, with a maximum continuous current of up to 7 A (corresponding to the UEE parameter in the technical specifications).
PWM Output: Control resolution is 12 bits, with an output frequency range of 10 Hz to 2 kHz and an accuracy of ±1 Hz; the maximum continuous current per channel is 1.5 A.
3. Application Scenarios
Thanks to the aforementioned features, the HEM3801C module is an ideal choice for the following applications:
Construction Machinery and Special‑Purpose Vehicles: Sensor signal acquisition—such as pressure, temperature, and angle sensors—for equipment like excavators, cranes, sanitation vehicles, and fire trucks, along with control of actuators including lights, solenoid valves, and alarms.
Agricultural Equipment: On tractors, harvesters, and other machinery, it monitors operational status and controls hydraulic systems or seeding and irrigation units.
Industrial Automation: In outdoor or harsh‑environment factory areas, it serves as a remote I/O station, acquiring equipment status and controlling field actuators.
Other harsh-environment applications: Any scenario requiring reliable data acquisition and control under conditions of high vibration, wide temperature ranges, dust, or humidity.
4. Installation, Connection, and Accessories
Installation: It can be securely mounted to an equipment panel or bracket using four M6×16 bolts, and it is lightweight.
Connection System: The module is equipped with two 23‑pin AMP automotive‑grade connectors—Type A and Type B—and supports molded wire harness systems, delivering exceptional vibration resistance, anti‑loosening performance, and sealing integrity.
Standard accessories: 0.5-meter standard cable harness; the order‑specific model is HP-005HEM3801C (“005” denotes 0.5 meters, with other lengths available upon request—e.g., the 3-meter version is HP-030HEM3801C).
Connector kit: Includes the sheaths, pins, and related accessories required for connection.
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If you have any needs, please contact the company's sales manager
Industrial Automation Industry: Liu Zhanjun
Contact number: +86-18890359678
Email: lzhj@hepauto.com.cn
Construction Machinery Industry: Wu Long
Phone: +86-18073052915
Email: long.wu@cspro.com.cn
Address: Building 13, Sanhe Zhihui Industrial Park, 426 Guyuan Road, Yuelu District, Changsha China