PQMII-T20 - Protocol Queue Manager Interface Module

PQMII-T20 – Protocol Queue Manager Interface Module

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Product Introduction:
The GE PQMII-T20 is a communication protocol management board for GE Mark VIe control systems. The “PQMII” stands for Protocol Queue Manager Interface, and its primary function is to manage and prioritize communication traffic between the controller and external devices. The “T20” revision indicates a specific hardware generation optimized for modern Ethernet-based protocols. This board acts as a traffic controller, ensuring that critical protection messages are delivered before less important data like historian trends, guaranteeing deterministic communication behavior.

Technical Specifications:
Board Type: Protocol Queue Manager Interface (PQMII)
Revision: T20
Ethernet Ports: 4 Gigabit Ethernet ports (RJ-45)
Fiber Ports: 2 SFP slots (1 Gbps or 10 Gbps depending on module)
Protocols: Modbus TCP, DNP3, IEC 61850, EtherNet/IP, PROFINET, OPC UA
Queue Depth: 1024 message queues with priority levels 0-7
Throughput: Up to 1 Gbps aggregate
Latency: Less than 5 milliseconds for priority traffic
Redundancy: MRP (Media Redundancy Protocol) support
Form Factor: VIC Eurocard (3U height)

Functional Features:
Traffic Prioritization: Implements 8 priority levels, ensuring that trip signals and protection commands are always transmitted first.
Message Queuing: Buffers messages during network congestion and releases them in priority order when bandwidth becomes available.
Protocol Translation: Translates between the proprietary GE protocol and standard plant protocols (Modbus, DNP3, IEC 61850).
Diagnostic Logging: Records all communication events, errors, and retries for post-event analysis.
Cybersecurity: Supports VLAN tagging, access control lists (ACLs), and port security to protect against unauthorized access.

Application Scenarios:
DCS Integration: Connects the Mark VIe turbine controller to the plant DCS (e.g., Emerson DeltaV, Honeywell Experion) using standard protocols.
Substation Communication: Used in power generation to communicate with the substation control system using IEC 61850 protocol.
SCADA Connectivity: Provides the communication link between the turbine controller and the central SCADA system for remote monitoring.
Protection System Networking: Ensures that protection trip signals are delivered with the highest priority over all other traffic.

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