Samsung SMTB-DO Digital Output Terminal Board
Samsung SMTB-DO Digital Output Terminal Board is a heavy-duty signal interface module designed to route command signals from central logic controllers to external field actuators. By converting micro-controller signals into isolated output channels, the SMTB-DO enables reliable switching for relays, contactors, solenoids, and indicator lights in demanding industrial control environments.
Technical Parameter List
| Parameter | Specification |
| Model | SMTB-DO |
| Module Type | Digital Output (DO) Terminal Board |
| Output Channels | 8 / 16 Channels (configuration dependent) |
| Output Signal Type | Relay Contact / Transistor (Sink/Source) |
| Switching Voltage | 24V DC / 120–240V AC |
| Max. Current Per Channel | 2.0 A (Relay) / 0.5 A (Transistor) |
| Isolation Type | Optocoupler Isolation (2500V RMS) |
| Status Display | Channel-specific Green LEDs |
| Terminal Connection | Screw-type / Spring-cage Terminal Blocks |
| Mounting | Standard 35mm DIN Rail |
Core Advantages & Features
High-Current Drive Capability: Interfaces low-power PLC outputs directly with high-power industrial loads like solenoid valves and motor starters.
Galvanic Isolation: High-voltage optocoupler barriers prevent field back-EMF spikes from reaching primary PLC processors.
Channel-Level Visual Diagnostics: Dedicated LEDs light up instantly upon channel activation for fast troubleshooting during downtime.
Compact Density: Space-saving footprint optimizes enclosure panel space while providing clear terminal marking.
Short-Circuit & Overload Protection: Integrated fuse options and transient suppression diodes shield internal components against electrical faults.
Model Classification
SMTB-DO-R: Relay Output Type (Ideal for high-current AC/DC switching and dry-contact isolation).
SMTB-DO-T: Transistor Output Type (Ideal for high-speed DC switching, pulse output, and solid-state reliability).
SMTB-DI: Digital Input Board (Complements the SMTB-DO for field status feedback signals).
SMTB-AI / AO: Analog Input/Output Modules (Used for variable process control signals like 4-20mA and 0-10V).
Environmental Tolerance Conditions
Operating Temperature: -10°C to +55°C (14°F to 131°F)
Storage Temperature: -25°C to +70°C (-13°F to 158°F)
Relative Humidity: 5% to 95% RH (Non-condensing)
Vibration Resistance: 10–57 Hz @ 0.075mm amplitude; 57–150 Hz @ 1.0g acceleration
Protection Class: IP20 (Enclosure panel mounting required)
Installation Method
DIN Rail Attachment: Hook the top groove of the SMTB-DO onto the standard 35mm DIN rail and push down firmly until the bottom latch snaps into place.
Wiring Connection: Strip 7mm of insulation from 14–22 AWG copper wire. Insert into terminal slots and tighten screws to a torque of 0.5 Nm.
Power Connection: Connect the 24V DC auxiliary power supply to the main V+ and V- terminals, observing polarity.
Grounding: Connect the dedicated frame ground (FG) terminal directly to the enclosure main grounding bus bar.
Operating Instructions
Pre-Commissioning Check: Verify output voltage parameters match field device ratings before applying logic power.
Status Inspection: Monitor channel LEDs during control tests: LED illuminated indicates active signal output state; off indicates standby.
Load Matching: Never exceed the maximum current rating per point (2A for relay models) to prevent contact welding or board damage.