Communication Module | Yokogawa CM1*A

The Yokogawa CM1*A, also cataloged as the CM1 Communication Module, operates as a dedicated hardware component for central data routing and protocol translation within CENTUM VP control platforms. Suffix Breakdown & Model Matrix CM1*A CM1: Base Communication Module Series *A: Hardware revision code and interface card option Hardware Specifications Parameter Specification Model CM1*A Brand Yokogawa Origin Unspecified Weight 0.45 kg Dimensions 120 mm x 80 mm x 35 mm Operating Temp 0 deg C to 55 deg C Storage Temp -20 deg C to 70 deg C Power Consumption 24 VDC typical Supported Systems CENTUM VP, CENTUM CS 3000 Communication Protocols OPC, Modbus RTU/TCP, Ethernet/IP Functions Data routing, message buffering, procedure execution Redundancy Support Hot standby, failover support 4-20 mA HART Loop Protocol and Channel Isolation The module incorporates channel-to-channel isolation architecture to mitigate common-mode noise and prevent ground loop interference across distributed process nodes. When interfacing with field networks or supervisory networks via OPC and Modbus TCP/RTU protocols, internal buffering mechanisms execute deterministic message queuing and hot-standby failover without interrupting signal integrity on active control loops. Frequently Asked Questions Q: Does the CM1*A support hot-standby failover without communication interruption? A: Yes, the module incorporates redundant hardware failover mechanisms, allowing seamless transition to a backup module in hot-standby mode upon primary link loss. Q: What are the input power supply requirements for the module internal bus? A: The unit operates on a standard 24 VDC supply voltage to power internal processing circuitry and communication transceivers. Q: Can the CM1*A module coexist with both CENTUM VP and CENTUM CS 3000 platforms? A: Yes, the communication interface is fully compatible with both CENTUM VP and CENTUM CS 3000 system architectures for protocol execution and data routing. Field Installation Guidelines Mount the module into the designated CENTUM nest slot, ensuring proper physical pin alignment before fully seating the board. Connect 24 VDC power wiring using properly rated conductors and maintain correct polarity during termination. Ensure all Ethernet and serial RS-485 Modbus cables are routed through grounded conduit separated from high-voltage AC lines to prevent EMI pickup. Verify cabinet ambient temperature remains within the specified 0 deg C to 55 deg C operational range with unblocked convection paths.