Hello everyone, friends. The S7-300 315-2PN -DP CPU I'm using gives BF per minute. Actually, PLC was working with 1 Robot - 1 Lumberg IO Module for a long time without any problems. However, I added 1 more Lumberg IO Module to the IO Module and it constantly gives CPU BF. How can I fix the problem that I think is this signal dropout? For example, is there a way to delay signal? If so, how can I do this? Would you tell? I have shared the Profibus schematic below. The Module I added later belongs to Address No. 40. I am waiting for your support for the solution. Thanks in advance.