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| Part Number: | PM865K01 3BSE031151R1 | Family/Series: | AC800M |
| Product Type: | PLC Communication Module | Category: | Home/DCS/DCS Systems/Profibus Module |
| Plance of Origin: | Made in USA | Product Status: | Popular Product |
Title: Configuring Redundant Optical Rings in Fieldbus Networks
Introduction: Ensuring the seamless functioning of a segmented field bus network is critical for optimal performance. This article explores the steps and conditions required to establish a redundant optical ring configuration, enhancing network reliability.
PM865K01 3BSE031151R1 CPU spare parts ▏ABB module ▏Robot system
Automatic Segmentation Recognition:
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- Segmentation is automatically lifted when both modules confirm the correct functioning of the segmented field bus network, facilitated by test frames.
- The network then self-organizes into a ring structure.
- Conditions for Network Configuration:
- Fulfilling specific conditions is crucial for the successful operation of the network.
- Conditions include settings for the operating mode (“Redundant optical ring”) on both optical ports of optical link modules (Hirschmann).
- Ring Formation Guidelines:
- All modules within a ring must be interconnected via fiber lines, with no inclusion of an RS485 bus line.
- In case of redundancy events, such as a line break, a brief switching time occurs, impacting data transmission.
- To ensure a smooth transition, setting the frame repeat (Retry) on the PROFIBUS master to at least 3 is recommended.
- Post-Error Handling:
- After correcting an error, no frames should be present in the network during the transformation of the optical line back into an optical ring.
- This precaution prevents potential disruptions that may arise when a master attempts to address a non-existent device.
- Configuration Requirements for Redundant Optical Ring:
- The parameter HSA (Highest Station Address) must be set to a value at least one greater than the highest address of a subscriber in the bus segment.
- The slot time should be adjusted to approximately twice the value required in a non-redundant network.
- Avoiding Configuration Failures:
- Failure to meet the above requirements can lead to the optical line not closing into a redundant optical ring after segmentation.
PM865K01 3BSE031151R1 CPU spare parts ▏ABB module ▏Robot system
Conclusion: Configuring redundant optical rings in fieldbus networks requires careful consideration of settings and conditions. Adhering to these guidelines ensures a robust network that can seamlessly recover from errors and interruptions, providing enhanced reliability and performance.
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