Siemens Simatic S7 Series User Manual

33
Programming a PLC
STEP 7-Micro/WIN32 STEP 7-Micro/WIN is the software used with the S7-200 PLC
to create a user program. STEP 7-Micro/WIN programs consist
of a number of instructions that must be arranged in a logical
order to obtain the desired PLC operation.
STEP 7-MicroWIN programming software can be run off line
or online.
Off-line programming allows the user to edit the
program and perform a number of maintenance tasks. The PLC
does not need to be connected to the programming device in
this mode.
Online programming requires the PLC to be connected to
the programming device. In this mode, program changes are
downloaded to the PLC. In addition, status of the input/output
elements can be monitored. The CPU can be started, stopped,
or reset.
S7-200 PLCs have two instruction sets,
SIMATIC and
IEC 1131-3. The SIMATIC instruction set was developed by
Siemens prior to the adoption of the IEC 1131-3 standard. The
IEC 1131-3 instruction set was adopted by the International
Electrotechnical Commission (IEC) to provide a common
approach for PLC programming. The IEC 1131-3 instruction set
is often preferred by users who work with PLCs from multiple
suppliers.
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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.