Block number error FB

Siemens PLC & VFD Error plc

Model: S7-1200/1500 | Code: 2535 (0x9ED)

Applicable Systems
S7-1200 S7-1500 S7-300 S7-400 LOGO! SINAMICS

Symptoms

Invalid FB (function block) number referenced.

Possible Causes

FB number does not exist or is out of range.

Troubleshooting Steps

Verify FB exists in the project and is downloaded to CPU.

How to Reset

Fix block reference and restart

Source: Siemens GetErrorID documentation

Category: PLC & VFD