4.1.6 Assignment overview
From the following block number assignment overview, you can find out whether a specific
block number (or block address) can be used for the PLC user program, or whether it is
assigned or reserved by Siemens or the PLC basic program.
Table 4-7 Assignment of FB numbers
FB number Availability Occupied by
0 Reserved Siemens
1 Occupied Siemens (PLC basic program)
2...14 Reserved Siemens
15 Occupied Siemens (PLC basic program)
16...29 Reserved Siemens
30...999 Freely available (user
program)
-
1000...1009 Reserved Siemens
1010...1019 Reserved or available Exclusively available for F blocks of Safety Integra‐
ted plus (F-PLC)
1020...1023 Reserved Siemens
1024...7999 Freely available (user
program)
-
Table 4-8 Assignment of FC numbers
FC number Availability Occupied by
0...1 Reserved Siemens
2...3 Occupied Siemens (PLC basic program)
4 Reserved Siemens
5 Occupied Siemens (PLC basic program)
6...29 Reserved Siemens
30...999 Freely available (user
program)
-
1000...1023 Reserved Siemens
1024...7999 Freely available (user
program)
-
Table 4-9 Assignment of DB numbers
DB number Availability Occupied by
1 Reserved Siemens
2...11 Occupied Siemens (PLC basic program)
12 Occupied Siemens (computer link and
transport system interface)
13...14 Reserved Siemens (PLC basic program)
15...16 Occupied Siemens (PLC basic program)
Programming the PLC
4.1 General information about the PLC program
SINUMERIK STEP 7 Toolbox V15.1
66 Configuration Manual, 12/2018, A5E46279635B AA
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