Siemens Simatic S7 Series System Manual

Special memory (SM) and system symbol names
D.1 SM (Special Memory) overview
S7-200 SMART
666 System Manual, 09/2015, A5E03822230-AC
SMB30 to SMB194 and SMB566 to SMB749 (S7-200 SMART read/write special memory)
As required, the S7
-200 CPU Operating System reads configura-
tion/control data
from special memory and writes new changes to the
system data stored in Special Memory.
Read system status
from CPU
Write (send) control
commands to the
CPU
Your program can read and write all SM addresses in this range, but the
normal usage of SM data va
ries 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, co
ntinuous
scanning of your program provides for continuous access to special
system features.
● SMB30 (port 0) and SMB130 (port 1) (Page 674) Port configuration for the integrated
RS485 port (Port 0) and the CM01 Signal Board (SB) RS232/RS485 port (Port 1)
● SMB34-SMB35 (Page 674) Time intervals for timed interrupts
● SMB36-45 (HSC0), SMB46-55 (HSC1), SMB56-65 (HSC2), SMB136-145 (HSC3)
(Page 675) High-speed counter configuration and operation
● SMB66-SMB85 (Page 678) PLS0 and PLS1 high-speed outputs
● SMB86-SMB94 and SMB186-SMB194 (Page 681) Receive message control
● SMW98 (Page 683) I/O expansion bus communication errors
● SMW100-SMW114 (Page 684) System alarms
● SMB130 (Page 674) Port configuration for the CM01 Signal Board (SB) RS232/RS485
port (Port 1) (See SMB30)
● SMB136-SMB145 (Page 685) HSC3 High-speed counter (See SMB36)
● SMB166-SMB169 (Page 678) PTO0 profile definition table
● SMB176-SMB179 (Page 678) PTO1 profile definition table
● SMB186-SMB194 (Page 681) Receive message control (See SMB86-SMB94)
● SMB566-SMB575 (Page 678) PLS2 high-speed output
● SMB576-SMB579 (Page 678) PTO2 profile definition table
● SMB600-SMB649 (Page 686) Axis 0 open loop motion control
● SMB650-SMB699 (Page 687) Axis 1 open loop motion control
● SMB700-SMB749 (Page 687) Axis 2 open loop motion control

Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies 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.