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maersk · Member 3 Joined: 17 Aug 2014 Posts: 891

Configuring Flexible F-Link Communication
Flexible F-Link offers the possibility of fail-safe CPU-CPU communication. The failsafe data is exchanged as failsafe arrays between the F-CPUs via standard communication mechanisms.
This application example demonstrates the use of Flexible F-Link communication between two controllers via a TCP connection. The example shows which points must be observed when configuring a Flexible F-Link connection. In addition, you will find a comparison of communication via Flexible F-Link and safety-related IO controller-IO controller communication or IO controller-I‑device communication with SENDDP/RCVDP.

In this application example, safety-related data is transferred between two controllers (here: PLC 1 and PLC 2) in both directions using the Flexible F-Link. Two Flexible F-Link connections must be used for this purpose. It is recommended to use a separate TCP connection for each Flexible F-Link connection for the transmission of data on the standard channel. The data can be sent and acknowledged via the same TCP connection. The function modules "TSEND" and "TRCV" are used for this purpose.

The following figure shows the principle of data transmission:
Configuring Flexible F-Link Communication Configuring Flexible F-Link Communication

Configuring Flexible F-Link Communication Configuring Flexible F-Link Communication

https://support.industry.siemens.com/cs/attachments/109768964/109768964_Flexible_F-Link_DOC_V10_en.pdf
https://support.industry.siemens.com/cs/attachments/109768964/109768964_Flexible_F-Link_PROJ_V10.zip