SAMSUNG SMCOM-08 Communication Expansion Card
SAMSUNG SMCOM-08 Communication Expansion Card
The SAMSUNG SMCOM-08 is a dedicated serial communication expansion card engineered for Samsung SPC and SM-series PLC systems. It expands the host controller’s networking capabilities by providing 8 independent serial communication ports (RS-232C / RS-422 / RS-485 configurable). The module enables seamless data exchange between the central PLC and peripheral field devices such as HMIs, variable frequency drives (VFDs), barcode scanners, smart meters, and third-party controllers.
Technical Table
| Parameter | Specification |
| Model | SAMSUNG SMCOM-08 |
| Communication Ports | 8 independent serial channels |
| Interface Standard | Software/Hardware configurable RS-232C / RS-422 / RS-485 |
| Baud Rate | 300 bps to 115.2 kbps per channel |
| Supported Protocols | Modbus RTU / ASCII, Samsung Master/Slave Protocol, User-defined serial protocols |
| Transmission Distance | RS-232C: Up to 15 m; RS-422/RS-485: Up to 1200 m (with termination resistor) |
| Isolation | Optocoupler isolation (1500V DC between field side and PLC backplane) |
| Power Consumption | Max 5V DC / 450mA (supplied via PLC backplane bus) |
| Connector Type | Terminal blocks / RJ45 / DB9 (model variant dependent) |
Environmental Tolerance Conditions
Operating Temperature: 0°C to +55°C (32°F to 131°F)
Relative Humidity: 5% to 95% RH (non-condensing)
Vibration Resistance: IEC 60068-2-6 compliant (10–57 Hz @ 0.075 mm amplitude, 57–150 Hz @ 1g)
Shock Resistance: IEC 60068-2-27 compliant (15g peak acceleration, 11 ms duration)
Noise Immunity: IEC 61000-4-4 (FTB) 2kV power lines / 1kV signal lines; ESD protection up to 8kV air discharge
Operating Environment: Free from corrosive gases, conductive dust, and direct sunlight
Operating Instructions
Hardware Setup:
Ensure power to the PLC rack is completely isolated.
Seat the SMCOM-08 firmly into the designated expansion slot on the baseplate and lock the retaining clip.
Attach matching 120 Ω termination resistors at both ends of the trunk for long-distance RS-485 networks.
Software Configuration:
Open the Samsung PLC programming environment (e.g., WinGPC).
Map the SMCOM-08 slot address in the I/O table.
Set communication parameters (Baud rate, Data bits, Stop bits, Parity) for each channel to match connected slave devices.
Data Exchange:
Utilize built-in read/write communication functions or memory mapping instructions in ladder logic to initiate polling cycles.
Fault Diagnosis
| Indicator / Symptom | Possible Cause | Corrective Action |
| RUN LED Off | Loose backplane seating or baseplate power supply failure. | Re-seat module into slot; check main 24V DC / 5V DC rack power supply. |
| ERR / FAULT LED On | Parameter mismatch or internal checksum error. | Check baud rate and frame settings in software; reload configuration to PLC. |
| TX/RX LED Inactive | Wiring polarity reversed or line break. | Verify signal wires (TX+/TX-, RX+/RX- or A/B); test continuity with a multimeter. |
| Intermittent Comm Failures | Electromagnetic interference (EMI) or ground potential difference. | Use shielded twisted-pair cables; connect cable shield to ground at one end only. |
Related Models of the Same Series
| Model | Description | Primary Application |
| SMCOM-02 / 04 | 2 / 4-Channel Serial Communication Card | Compact serial network expansion |
| SMETH-01 | Industrial Ethernet Module | Modbus TCP / EtherNet/IP host communication |
| SMCU-CPU | Main Controller CPU | Central processing unit for Samsung SPC/SM PLCs |
| SMAD-8 | Analog Input Module | 8-Channel multi-range analog signal processing |
| SMDA-4 | Analog Output Module | 4-Channel voltage/current signal output control |
Storage Conditions
Storage Temperature: -25°C to +70°C (-13°F to 158°F)
Storage Humidity: 5% to 95% RH (non-condensing)
Packaging: Keep in original anti-static packaging until installation to prevent ESD damage.
Storage Environment: Store in a dry, clean warehouse free from aggressive chemicals, moisture, and mechanical vibration.