Samsung SMTB-AI Analog Input/Output Terminal Board
Samsung SMTB-AI Analog Input/Output Terminal Board is an industrial-grade interface module designed to convert and isolate field instrumentation signals for seamless communication with main Samsung PLC and DCS controllers. Designed for high-precision process monitoring and closed-loop control, the SMTB-AI module stabilizes incoming sensor feeds (such as 4–20mA and 0–10V signals) against high-voltage surges, electrical noise, and ground potential differences.
Application Cases
Chemical & Petrochemical Processing: Interfacing temperature, pressure, and flow transmitters in hazardous areas to central control rooms with high immunity to electrical interference.
Water & Wastewater Treatment: Transmitting multi-channel sensor signals (pH, turbidity, level sensors) over long cable runs to main PLC racks.
HVAC & Building Automation: Driving proportional modulating valves and reading precise temperature/humidity sensor feedback for large-scale environmental control systems.
Variable Frequency Drive (VFD) Speed Control: Providing smooth 0–10V DC analog speed command references to motor drives in automated conveyor systems.
Product Advantages and Features
High-Precision Signal Processing: Maintains signal accuracy with low drift rates for critical analog measurements across process lines.
Galvanic & Optical Isolation: 1500V AC isolation per channel prevents ground loops and shields sensitive controller electronics from field surges.
Dual Channel Support: Flexible architecture handles both Analog Input (AI) and Analog Output (AO) signal conditioning on a single terminal platform.
Noise Mitigation: Integrated passive filtering cancels high-frequency electromagnetic interference (EMI) generated by heavy machinery and VFDs.
Durable DIN-Rail Layout: Compact footprint with clear channel marking accelerates control cabinet layout and maintenance identification.
Other Models in the Same Series
| Model Code | Signal Format | Primary Function |
| SMTB-AI | Analog Input / Output (4-20mA, 0-10V) | Precision sensor acquisition & analog control output |
| SMTB-DI | Digital Input (Dry/Wet Contacts) | Field contact status monitoring & high-voltage isolation |
| SMTB-DO | Digital Output (Relay / Transistor) | High-current actuator driving & relay control |
| SMTB-COM | Fieldbus / Serial Communication | Serial signal conditioning (RS-485 / Modbus interface) |
Installation and Maintenance
Cabinet Mounting: Secure the module onto standard 35mm DIN rail inside an IP54-rated or higher control enclosure to guard against moisture and dust.
Shielded Wiring Practice: Always use twisted-shielded pair wires for analog signals. Connect the shielding braid to the FG (Frame Ground) terminal at the board end only to eliminate ground loops.
Torque Specifications: Insert stripped wire ends (6–8mm) into screw terminals and tighten to a maximum torque of 0.5 Nm.
Periodic Inspection: Conduct annual terminal screw tightness checks to counteract vibration loosening. Inspect signal accuracy using a calibrated 4–20mA loop tester during routine plant turnarounds.