The OMRON SRM1-C02-V2 is a subminiature CompoBus/S Master Control Unit that integrates remote I/O controller functions into a single stand-alone device. It enables distributed industrial automation by supporting up to 32 Slaves per Master—yielding 256 I/O points maximum—while centralizing only the master unit in the control panel and dispersing I/O devices across the machine. This architecture dramatically reduces wiring complexity and optimizes panel real estate.
Technical Specifications
Processing & Memory
• Program capacity: 4,096 words
• Data memory: 2,048 words + 512 words read-only
• Instruction set: 125 total instructions (14 basic, 81 special)
• Instruction execution: LD = 0.97 µs; MOV = 9.1 µs
• Work bits: 640
• Timers/Counters: 128
• Programming language: Ladder diagram
Memory Backup
• User programs: Flash memory (battery-free)
• Data memory: Super capacitor (20-day backup at 25°C) or Lithium battery (10-year minimum life at 25°C)
Communications
• Protocol: CompoBus/S with Manchester coding
• Baud rate: 750,000 bps / 93,750 bps (software switchable via DM settings; default 750 kbps)
• Connection: Multi-drop and T-branch methods
• High-speed mode cycle time: 0.5 ms maximum (750 kbps, 8 Slaves input + 8 Slaves output); 0.8 ms with 16+16 Slaves
• Long-distance mode cycle time: 4.0 ms to 6.0 ms (93.75 kbps, 8 to 16 Slaves per direction)
• High-speed range: 100 m maximum
• Long-distance range: 500 m maximum
• Cable: 2-conductor VCTF (0.75 × 2); main line ≤100 m, branch line ≤3 m, total branch ≤50 m
– Key Features
• Analog instruction support (PID, SCL, NEG, ZCP)
• Dual communications rate switching for speed vs. distance trade-offs
• Flexible data memory architecture with configurable read-only allocation
• Extended I/O capacity via slave expansion without panel modification
– Typical Applications
Distributed machine control systems, decentralized process automation, panel-mounted master with remote sensor/actuator networks.
– Compatibility & Integration
Programs written in ladder diagram; integrates with OMRON CompoBus/S slave devices and controllers supporting Manchester-coded serial communication.
