Product Short Description
Product Name: MEMOCON-SC Series Optical Isolation Interface Module
Product Introduction: This is an optically isolated interface bridge module for Yaskawa MEMOCON-SC PLC systems. It provides electrical isolation between the PLC backplane and external devices, and supports long-distance communication expansion for industrial control networks.
Description
Technical Specifications:
- Interface type: Optically isolated serial interface
- Isolation voltage: 2500 VAC (logic side to field side)
- Communication protocol: MEMOBUS (Yaskawa proprietary protocol)
- Transmission speed: 9600 bps / 19200 bps (selectable via DIP switch)
- Transmission distance: Up to 1000 m (RS-485 mode)
- Power supply: 24 VDC (from PLC backplane)
- Current consumption: 120 mA
- Operating temperature: 0°C to +55°C
- Storage temperature: -25°C to +85°C
- Humidity: 30% to 95% RH (non-condensing)
- Weight: ~0.3 kg
Function Features:
- Complete optical isolation between PLC internal circuit and external field devices
- Supports both point-to-point and multi-drop network configurations
- Automatic baud rate detection and configuration
- Built-in surge protection on communication lines
- Status indicators for power, transmit, and receive activity
- Compatible with all MEMOCON-SC series CPU modules
Application Scenarios:
- Long-distance PLC communication networks
- Factory floor distributed I/O systems
- Multi-PLC interconnection in large automation systems
- Electrical noise-heavy industrial environments
- Process control systems with high voltage differences
- Remote HMI and SCADA connections
Performance Parameters:
- Isolation resistance: 100 MΩ minimum at 500 VDC
- Common mode rejection: 1000 V peak at 50/60 Hz
- Data bits: 7 or 8 bits (configurable)
- Stop bits: 1 or 2 bits (configurable)
- Parity: None, odd, even (configurable)
- Response time: < 10 ms
Material Composition:
- Housing: Flame-retardant polycarbonate plastic
- Optocouplers: High-speed infrared LED-phototransistor pairs
- PCB: FR-4 glass epoxy with copper traces
- Connectors: D-sub 9-pin (RS-485/RS-422)
- Transformer: Toroidal pulse transformer for signal isolation
Structure Characteristics:
- Single-slot width for MEMOCON-SC rack mounting
- Front panel with LED status indicators
- D-sub connector on front panel for field wiring
- DIP switches for baud rate and protocol configuration
- Compact form factor for standard PLC rack installation
- Low power consumption design
Working Principle:
- Converts electrical signals from PLC backplane into optical signals via optocouplers
- Transmits optical signals across isolation barrier and converts back to electrical signals
- Implements serial communication protocol handling for MEMOBUS network
- Provides electrical noise immunity by breaking ground loops
- Automatically retransmits data on detection of communication errors
Installation Requirements:
- Install in any available I/O slot of MEMOCON-SC rack
- Configure DIP switches for correct baud rate and protocol before power-up
- Use shielded twisted-pair cable for field communication wiring
- Connect cable shield to single point ground at one end only
- Ensure proper termination resistors at network endpoints
- Keep communication cables away from high-voltage power lines
Usage Notes:
- Do not exceed maximum cable length specifications
- Use only shielded cables to ensure noise immunity
- Do not connect or disconnect communication cables while power is applied
- Verify DIP switch settings before applying power
- Periodically inspect cable connections for corrosion or looseness
- Do not use in environments with strong electromagnetic interference
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