Description
Emerson PMCSPAN
Technical Specifications
- Form factor: PMC mezzanine card
- Bus interface: Fieldbus communication
- Electrical isolation between host side and field bus side
- Operating ambient temperature: 0℃ ~ 60℃
- Storage temperature: -40℃ ~ 85℃
- Relative humidity: 5% ~ 95%, non-condensing
- Onboard protocol processing chip and communication buffer memory
Functional Features Onboard protocol processor completes fieldbus data encoding and decoding independently without occupying excessive host CPU resources. Electrical isolation blocks common-mode voltage and surge interference from field bus cables. Real-time bus monitoring detects communication interruption and frame error and reports fault status to host system. Front panel LED indicators show bus running state and communication activity. PMC standard interface enables simple installation on VME single board computers.
Application Scenarios VME embedded control systems for power, metallurgy and heavy machinery. It connects host single board computer with fieldbus smart transmitters, actuators and remote I/O devices.
Performance Parameters
- Independent protocol processing maintains low communication latency for real-time control data
- Isolation circuit suppresses ground loop noise from long-distance field bus wiring
- Fault detection circuit identifies bus communication abnormality rapidly
- Onboard buffer memory prevents data loss during temporary bus fluctuation
Material Composition High-density multi-layer flame-retardant glass fiber epoxy PCB. Protocol processing chip, bus transceiver, isolation components, buffer memory chips and LED indicators. Gold-plated PMC edge connector for connecting with host single board computer. Metal fixing bracket.
Structural Features Standard PMC mezzanine card size. Edge gold-plated connector mates with PMC slot of VME single board computer. Small metal bracket fixes the module onto host board. Front panel carries LED indicators and external bus wiring terminals. Component layout reserves airflow path for heat dissipation.
Working Principle The module communicates with host VME single board computer through PMC interface. It receives control commands and data from host processor, encodes data into fieldbus protocol frames and sends to field devices via bus transceiver. Signals uploaded from field instruments are decoded by onboard processor and transmitted back to host computer. The module continuously monitors bus signal quality and frame integrity, uploading fault alarm once communication abnormality occurs.
Installation Requirements Power off VME chassis before installation. Align PMC connector with host board PMC slot and fasten fixing bracket. Use shielded bus cable for field device connection. Cable shield grounding follows single-point grounding rule. Keep ventilation path of VME chassis unblocked. Configure bus parameters in host software after hardware installation.
Precautions for Use Take anti-static protection when handling the module. Backup communication configuration parameters before module replacement. Do not touch gold-plated PMC edge connector directly. Keep chassis cooling fan and filter clean. Avoid overvoltage applied to field bus terminals.
