Siemens Simatic S7 Series System Manual

Special memory (SM) and system symbol names
D.12 SMB30: (port 0) and SMB130: (port 1)
S7-200 SMART
674 System Manual, 09/2015, A5E03822230-AC
D.12
SMB30: (port 0) and SMB130: (port 1)
SMB30 configures port 0 (onboard RS485 port).
SMB130 configures port 1 (optional CM01 signal board).
You can read and write to SMB30 and SMB130. These bytes configure the respective
communication port for Freeport operation and provide selection of either Freeport or system
protocol support.
D.13
SMB34-SMB35: Time intervals for timed interrupts
Special memory bytes 34 and 35 control the time interval of timed interrupts 0 and 1. You
can assign time intervals (in 1-ms increments) from 1 ms to 255 ms. The time-interval value
is captured by the CPU at the time that the corresponding timed interrupt event is attached to
an interrupt routine. To change the time interval, you must reattach the timed interrupt event
to the same interrupt routine or to a different interrupt routine. You can terminate a timed
interrupt event by detaching the event.
Table D- 8 SMB34-SMB35 timed interrupt intervals
S7-200 SMART
symbol name
SM address
Description
Time_0_Intrvl
SMB34
Timed interrupt 0: Time interval value (in 1 ms increments from 1 ms to 255 ms).
Time_1_Intrvl
SMB35
Timed interrupt 1: Time interval value (in 1 ms increments from 1 ms to 255 ms).

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.