Strange ADF Error on S5-155U

Hi there,

Here I copy and paste what is manual said:

OB 25: Addressing Error (ADF)

An addressing error occurs when a STEP 5 operation references a process image input or output to which no I/O module was assigned at the time of the last COLD RESTART (the module is not plugged in, it

is defective, or it is not defined in data block DB 1 of the CPU. The STEP 5 operation at which the addressing error occurred is processed completely: For bit operations, the bit in the process image is scanned and combined logically or set/reset. Load and transfer operations are also executed. Continued processing can, however, result in incorrect or unwanted reactions.

Causes of Error and Reactions of the CPU

When an addressing error occurs, the system program interrupts further processing of the user program and calls organization block OB 25. After running the program contained in OB 25, the program is

resumed at the next operation. If OB 25 is not loaded, the CPU changes to the STOP mode with an

addressing error. The STEP 5 IAE operation disables addressing error monitoring for individual program parts or for the entire program. You can enable it again using the RAE operation (see Section 3.5.4 and List of Operations).

You can get the manual here https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csSearch&objaction=cssearch&lang=en&siteid=cseus&query=&query2=948&content=adsearch%2Fadsearch%2Easpx

and here https://support.automation.siemens.com/WW/adsearch/resultset.aspx?region=WW&lang=en&netmode=internet&ui=NDAwMDAxNwAA&term=948&ID=1087149&ehbid=1087149&docid=1118283