Some Thoughts on Profibus Master (H) does not correctly identify and handle RS frames of Dp-slave reply

Figure 1. In the course of the test, it was found that Profibus Master (H) could not correctly identify and process the RS frame of the dp-slave reply, causing Slave to reply to the RS frame by "disconnecting the Profibus cable between the Slave and Master and then restoring the physical link", But Master has been asking for data, but Slave replied to Rs to notify Master of "service mismatch". Figure 1: This RS interaction process is analyzed and possible solutions are proposed.

Figure 1

Figure 2: During the test, the PROFIBUS master (a) correctly identifies and processes the RS frame of the Dp-slave reply , and Master (a) increases the req_fdl_ in the DATA_EX cycle communication compared to master (H) Status operation, this operation is also very good.

Figure 2.

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Some Thoughts on Profibus Master (H) does not correctly identify and handle RS frames of Dp-slave reply