CIP Motion Traffic Synchronization with Dynamic TSN Qbv Scheduling
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Solution Overview
Problem
Industrial networks face challenges with asynchronous access to time-sensitive networks (TSN) causing significant access latency and unscheduled CIP motion traffic being delayed by higher priority traffic, leading to degraded performance and potential failure of CIP motion applications.
Innovation Solution
Implementing a system and method for synchronous network access (SNA) in CIP motion controllers and drives within TSN networks, using an electronic processor to determine and adjust Qbv configurations for industrial controllers and devices to ensure timely delivery of CIP motion traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If asynchronous access to TSN is used in CIP motion controllers and drives, then device complexity is reduced and ease of operation is improved, but network access latency increases and CIP motion performance degrades
Solution Approach 1:
The system dynamically adjusts the asynchronous operation mode based on TSN scheduling requirements. The CIP motion controller and drive can operate asynchronously while the system dynamically synchronizes their access timing to TSN network slots, allowing flexible operation without fixed rigid timing constraints while still meeting latency requirements
Solution Approach 2:
The system changes the timing parameters of TSN network access based on the specific CIP motion application requirements. By adjusting slot allocations, gate control times, and network scheduling parameters, the system optimizes network access latency while maintaining asynchronous operation benefits
2Device complexity
If unscheduled CIP motion traffic is transmitted in TSN networks, then device complexity is reduced, but traffic is delayed by higher priority scheduled traffic causing performance degradation
Solution Approach 1:
The system performs preliminary scheduling of CIP motion traffic by pre-configuring TSN network parameters, slot allocations, and gate control settings before actual motion operations begin. This preliminary network configuration ensures that CIP motion traffic has reserved network resources and predictable access timing, preventing delays from higher priority traffic while keeping device complexity low
Solution Approach 2:
The system introduces TSN network scheduling mechanisms as an intermediary layer between CIP motion controllers/drives and the physical network. This intermediary manages traffic prioritization, slot allocation, and timing coordination, allowing unscheduled CIP motion traffic to coexist with scheduled traffic without performance degradation
3Ease of operation
If asynchronous access to TSN is implemented, then ease of operation is improved, but alignment of motion application data and scheduled network access varies causing data loss or late delivery
Solution Approach 1:
The system implements feedback mechanisms that monitor the alignment between motion application data generation and TSN network slot availability. When misalignment is detected, the system adjusts timing parameters, slot allocations, or data buffering strategies to ensure data is ready for transmission when network slots become available, maintaining both ease of operation and data delivery reliability
Data Source
AI summary
Systems and methods for synchronizing motion connection communication to time-aware network for industrial systems. One system includes an electronic processor configured to determine a controller Qbv configuration for an industrial controller included in a TSN. The electronic processor is also configured to determine, based at least in part on the controller Qbv configuration, a first start of a Qbv slot for isochronous traffic for an industrial device included in the TSN. The electronic processor is also configured to adjust, based at least in part on the first start of the Qbv slot for isochronous traffic for the industrial device, network scheduling for the industrial device. The electronic processor is also configured to deploy the adjusted network scheduling to the industrial device.