H-Sync Forwarding

H-Sync Forwarding

H-ync Forwarding enables a PROFINET device with MRP to forward synchronization data (synchronization frames) of a S7-1500R redundant system only within the PROFINET ring.

In addition, H-ync Forwarding forwards the synchronization data even during reconfiguration of the PROFINET ring.

 H-Sync Forwarding avoids a cycle time increase if the PROFINET ring is interrupted.

Note
Support of H-ync Forwarding The technical specifications typically state whether a PROFINET device supports H-Sync Forwarding.

The GSD file will also indicate whether the device supports H-Sync Forwarding. 

The device supports H-Sync Forwarding when the "AdditionalForwardingRulesSupported" attribute in the
"MediaRedundancy" element is set to "true".

Conditions:
• H-Sync Forwarding is not relevant for redundant S7-1500H systems. 

With the redundant S7-1500H system, the H-Sync frames are transmitted exclusively via the fiber-optic cables.

• When you use PROFINET devices with more than two ports (e.g. switch) in the PROFINET ring of an R-system, then H-Sync Forwarding is mandatory for these devices.

H-Sync frames leave the PROFINET ring with a switch without H-Sync Forwarding. 

This results in an additional load on the network. Another serious result is that the redundancy of other R-systems in the network can fail or startup can be prevented.

• H-ync Forwarding is recommended for all devices in the PROFINET ring if you are using PROFINET devices with only 2 ports in the PROFINET ring of an R-system.

 

 

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H-Sync Forwarding을 사용하면 MRP가 있는 PROFINET 장치가 S7-1500R 중복 시스템의 동기화 데이터(동기화 프레임)를 PROFINET 링 내에서만 전달할 수 있습니다.

또한, H-Sync Forwarding은 PROFINET 링을 재구성하는 동안에도 동기화 데이터를 전달합니다.

 H-Sync Forwarding은 PROFINET 링이 중단된 경우 사이클 시간 증가를 방지합니다.

메모
H-Sync Forwarding 지원 기술 사양에는 일반적으로 PROFINET 장치가 H-Sync Forwarding을 지원하는지 여부가 명시되어 있습니다.

GSD 파일에는 장치가 H-Sync Forwarding을 지원하는지 여부도 표시됩니다. 

장치는 의 "Additional ForwardingRulesSupported" 속성이 있을 때 H-Sync Forwarding을 지원합니다
"Media Redundancy" 요소가 "true"로 설정되었습니다.

조건:
• H-Sync Forwarding은 중복 S7-1500H 시스템과 관련이 없습니다. 

중복 S7-1500H 시스템에서는 H-Sync 프레임이 광섬유 케이블을 통해서만 전송됩니다.

• R-시스템의 PROFINET 링에 두 개 이상의 포트(예: 스위치)가 있는 PROFINET 장치를 사용하는 경우 이러한 장치에는 H-Sync Forwarding이 필수입니다.

H-Sync 프레임은 H-Sync Forwarding 없이 PROFINET 링을 스위치로 남깁니다. 

이에 따라 네트워크에 추가적인 부하가 발생합니다. 또 다른 심각한 결과는 네트워크 내 다른 R-시스템의 중복이 실패하거나 시작을 막을 수 있다는 것입니다.

• R 시스템의 PROFINET 링에서 2개의 포트만 있는 PROFINET 장치를 사용하는 경우 PROFINET 링의 모든 장치에 H-Sync Forwarding을 권장합니다.