I. Model Composition (Essential to Understand)
IT94-3: Series Model (IT = Intelligent Terminal; 94 = High Performance Level; 3 = 3 Extension Bays)
HESG440310R2: Controller Body (CPU + Communication + Power Supply + Logic Unit)
HESG112699/B: I/O Base + Wiring Package (Installation and Signal Wiring Required)
✅ Order must be placed in pairs: HESG440310R2 + HESG112699/B
II. Core Functions
Remote I/O Control: AI/AO/DI/DO Signal Acquisition and Output (Compatible with 4-20mA/0-10V/24V DC)
Real-time Processing: Embedded Linux, Independent Processor, Supports PID, Filtering, Alarm Logic
Multi-protocol Communication: TCP/IP, Profibus-DP, Modbus RTU/TCP, Connects to Host Computer and Third-Party Devices
Expansion Capability: 3 Extension Bays, Up to 128 Points of I/O, Supports Hot Swap and Redundant Configuration
Fault Diagnosis: Built-in Self-Diagnosis, Fault Upload to DCS, Ensures System Safety
Technical Parameters (Key Items)
Power Supply: 24V DC (±10%)
Power Consumption: ≤15W
Temperature: -20℃ ~ +60℃ (Industrial Grade)
Certifications: CE, UL, CSA, Compliant with IEC 61508 (SIL 2/3)
Size (mm): 150 × 100 × 75; Weight: Approximately 1.2kg
Typical Applications
Power / Metallurgy: Boiler, Turbine, Rolling Mill Remote Control Station
Petrochemical: Reactor, Distillation Tower Signal Acquisition and Control
Water Treatment / Building: Pump Station, Air Conditioning System I/O Node
Advantages: Distributed Control, Centralized Management, Reduces Central Control Wiring, Enhances System Reliability
V. Difference from Encoder (Reiteration)
IT94-3: Controller – Receives Encoder / Sensor Signals → Process → Upload to DCS → Output Control
Encoder: Sensor – Measuring Speed / Position → Output Pulse or Absolute Value Code → Given to Controller
VI. Model Selection Alternatives
Same Series: IT92-2 (Entry-Level), IT95-4 (High Performance)
AC 800M Local I/O: AI810, DO810, etc. (Suitable for Short Distance)
Third-party Alternatives: Remote I/O Modules Supporting Profibus/Modbus (e.g. WAGO, Phoenix)
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