Siemens S7-1200 PROFIBUS - Page 29

Configuration and program blocks
4.3 New slave address with data record 0x2001
SIMATIC CM 1242-5
Operating Instructions, 01/2023, C79000-G8976-C245-06
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When the CPU has transferred the configuration data to the CP during startup, it changes to
the RUN status. Only then can it change the address using data record 0x2001. The station
then runs free of errors.
If the data record is written with invalid values (wrong version, too short, invalid address
etc.), SFB53 signals a general error and no address change is made.
If the data record is written several times within a short period, the last address to be written
is used.
Table 4- 1 Example of the byte assignment of data record 0x2001 version V1.0
Byte 1
Byte 2
Byte 3
Byte 4
Meaning
Version (high
byte)
Version (low
byte)
Opcode
• 0 = do not change
address
• 1 = change address
Data from Opcode
Assignment
(example)
01H 00H 01H 20H
Meaning of the
example
Version 1.0
The address is to be
changed.
New address = 32