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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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