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Siemens Simatic S7 Series System Manual

Siemens Simatic S7 Series
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Open loop motion control
12.10 Advanced topics
S7-200 SMART
556 System Manual, 09/2015, A5E03822230-AC
12.10.2
Special memory (SM) locations for the Axis of Motion
The CPU allocates 50 bytes of special memory (SM) to each Axis of Motion. (See the
following table.) When the Axis of Motion detects an error condition or a change in status of
the data, the Axis of Motion updates these SM locations. The first Axis of Motion updates
SMB600 through SMB649 as required to report the error condition, the second Axis of
Motion updates SMB650 through SMB699, and so on.
Table 12- 48 Special memory bytes SMB600 to SMB749
SM bytes for Axes of Motion:
Axis of Motion 0
Axis of Motion 1
Axis of Motion 2
SMB600 to SMB649 SMB650 to SMB699 SMB700 to SMB749
The following table shows the structure of the SM data area allocated for an Axis of Motion.
The definition uses Axis 0 as an example.

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Siemens Simatic S7 Series Specifications

General IconGeneral
CPUVaries by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication InterfacesPROFIBUS, PROFINET, Ethernet, MPI
ProgrammingTIA Portal, STEP 7
Programming LanguagesLAD, FBD, STL, SCL, GRAPH
I/O ModulesDigital, Analog, Specialty modules available
Operating Temperature0°C to 60°C (standard models)
MountingDIN rail mounting
Operating Voltage24V DC or 120/230V AC (varies by model)
Protection ClassIP20 (standard models)
MemoryVaries depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.

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