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Internal error -> causing CPU to stop

4/25/2023 6:43 AM	Rate (0)
Jasner Experienced Member Joined: 6/10/2008 Last visit: 10/28/2024 Posts: 193 Rating: (1)	Hello, I have S7-400 CPU 6ES7 416-3FS06-0AB0 that is going to stop after download. The following data is found in the diagnostic buffer: STOP caused by programming error (OB not loaded or not possible, or no FRB) Breakpoint in user program: Cyclic program (OB1) Priority class: 1 OB number: 1 Module address: 102 Previous operating mode: RUN Requested operating mode: STOP (internal) Internal error, Incoming event and Event ID 16# 253C FC not loaded FC number: 1 OB number: 1 Module address: 102 Requested OB: Programming error OB (OB121) OB not found, or disabled, or cannot be started in the in the current operating mode Internal error, Incoming event 08:20:14.178 AM 04/25/2023 (Coding: 16# 253C FE79 887C 0001 0001 0066) Can you please advise me what I need to check further in order to find the cause of this behavior? Thank you.

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4/25/2023 12:05 PM	Rate (0)
Jen_Moderator Diamond Member Joined: 6/19/2017 Last visit: 9/6/2024 Posts: 8175 Rating: (172)	Closed cause question posted twice. The second thread with the subject Internal error -> causing CPU to stop is published within the conference SIMATIC S7-400 / S7-400H / S7-400F /FH. Best regards, Jen_Moderator

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