SAMSUNG SMDI-8 Digital Input Module (8CH)
SAMSUNG SMDI-8 is an 8-channel digital input expansion module designed for SAMSUNG industrial PLC systems. Engineered to capture discrete signals from field components such as limit switches, photoelectric sensors, and pushbuttons, it provides reliable real-time signal processing and system state monitoring across automated production environments.
Technical Parameter List
| Parameter | Technical Standard / Specification |
| Model | SAMSUNG SMDI-8 |
| Input Channels | 8 isolated digital channels |
| Rated Input Voltage | 24V DC (Sink / Source configurable) |
| Operating Input Range | 15V DC to 30V DC (Logic 1) / 0V DC to 5V DC (Logic 0) |
| Isolation Protection | Optocoupler isolation between field terminal and system bus |
| Response Time | High-speed input filtering (< 1.5 ms off-to-on / on-to-off) |
| Channel Status Indicator | 8 LED indicators for real-time channel status display |
| Wiring Connection | Removable screw terminal block |
Product Features / Core Advantages
Optocoupler Isolation: Provides reliable galvanic isolation to shield sensitive central controller logic from field-level electrical noise and voltage spikes.
Flexible Logic Configuration: Supports both sink (NPN) and source (PNP) wiring options to ensure compatibility with a broad range of industrial sensors.
Instant Signal Diagnostics: Channel-dedicated status LEDs enable field engineers to perform fast visual troubleshooting and loop verification.
Compact Plug-in Structure: Designed for quick mounting onto standard system backplanes or DIN-rail setups, minimizing cabinet footprint.
Model Classification
SAMSUNG SMDI-8: Standard 8-channel digital input module (24V DC).
SAMSUNG SMDI-16: High-density 16-channel digital input module.
SAMSUNG SMDO-8: Matching 8-channel digital output module (relay / transistor output).
SAMSUNG SMCPU-08: Central processing unit module for system orchestration.
Environmental Tolerance Conditions
Operating Temperature: 0°C to 55°C (32°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: Meets IEC 60068-2-6 standard for industrial control environments
Noise Immunity: Compliant with IEC 61000-4-2/4/5 noise tolerance standards
Installation Method
System Power Off: Ensure main AC/DC supply to the controller rack is switched off prior to module insertion.
Backplane Slot Alignment: Align the rear bus connector with the target backplane expansion slot and press firmly until fully locked into place.
Terminal Block Wiring: Strip input signal leads appropriately and secure them into the terminal block according to the pinout diagram.
Earthing & Cable Routing: Ensure system ground is connected securely, and keep signal wires separated from high-voltage AC lines.
Operating Instructions
Verify that field power voltage stays strictly within the specified 24V DC tolerance range before turning on the power supply.
Check channel LEDs upon system startup: active sensor signals should trigger corresponding LED illumination.
Perform routine inspections on terminal block screw tightness to prevent signal loss caused by mechanical vibration over time.