Siemens SIMATIC S7 System Manual page 800

Special memory (SM) and system symbol names
D.1 SM (Special Memory) overview
● SMB1100-SMB1399 (Page 827) EM (expansion module) hardware/firmware ID
● SMB1400-SMB1699 (Page 830) EM (expansion module) module-specific data
SMB30 to SMB194 and SMB566 to SMB749 (S7-200 SMART read/write special memory)
Read system status
from CPU
Write (send) control
commands to the
CPU
● SMB30 (Port 0) and SMB130 (Port 1) (Page 809) Port configuration for the integrated
RS485 port (Port 0) and the CM01 Signal Board (SB) RS232/RS485 port (Port 1)
● SMB34-SMB35 (Page 809) Time intervals for timed interrupts
● SMB36-45 (HSC0), SMB46-55 (HSC1), SMB56-65 (HSC2), SMB136-145 (HSC3),
SMB146-SMB155 (HSC4), SMB156-SMB165 (HSC5) (Page 810) High-speed counter
configuration and operation
● SMB66-SMB85 (Page 816) PLS0 and PLS1 high-speed outputs
● SMB86-SMB94 and SMB186-SMB194 (Page 819) Receive message control
● SMW98 (Page 821) I/O expansion bus communication errors
● SMW100-SMW114 (Page 822) System alarms
● SMB130 (Page 809) Port configuration for the CM01 Signal Board (SB) RS232/RS485
port (Port 1) (See SMB30)
● SMB146-SMB155 (HSC4) and SMB156-SMB165 (HSC5) (Page 823) High-speed counter
configuration and operation (See SMB36)
● SMB166-SMB169 (Page 816) PTO0 profile definition table
● SMB176-SMB179 (Page 816) PTO1 profile definition table
● SMB186-SMB194 (Page 819) Receive message control (See SMB86-SMB94)
● SMB566-SMB575 (Page 816) PLS2 high-speed output
● SMB576-SMB579 (Page 816) PTO2 profile definition table
● SMB600-SMB649 (Page 824) Axis 0 open loop motion control
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The S7-200 SMART CPU performs these actions:
• Reads configuration/control data from special memory
• Writes new changes to the system data in special memory.
Your program can read and write all SM addresses in this range. The
normal usage of SM data varies according to the function of each ad-
dress.
SM addresses provide a means to access system status data, configure
system options, and control system functions. In run mode, continuous
scanning of your program provides for continuous access to special
system features.
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART