Siemens Simatic S7 Series User Manual

17
Putting it Together The user memory of a PLC, such as the S7-200 PLC shown in
the following illustration, includes space for the user program as
well as addressable memory locations for storage of data. The
amount of program and data space available depends on the
CPU model.
User program space stores instructions that are executed
repetitively as part of the PLC scan. The user program is
developed using a programming device, such as a personal
computer (PC) with programming software, then loaded into the
user program memory of the PLC.
A variety of addressable memory locations are used for storage
of data that is available to the user program. Among other
things, this includes memory locations for variable data, discrete
inputs and outputs, analog inputs and outputs, timers, counters,
high-speed counters, etc.
I0.0 I0.1
Q0.0
Q0.1
I0.4
I0.5
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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.