STEP 7 Professional V5.5 software is Siemens software used to program the S7-300, S7-300 PLC. This is the version used for Windows 32bit (64bit) computers.
Simatic Step 7 Professional V5.5 supports the following operating systems:
+ Windows XP Professional SP2
+ Windows XP Professional SP3
+ Windows 7 Professional/Enterprise/Ultimate (32 Bit)
+ Windows 7 Professional/Enterprise/Ultimate SP 1 (32 Bit)
+ Windows Server 2003 SP2
+ Windows 7 Professional/Enterprise/Ultimate (64 Bit)
+ Windows 7 Professional/Enterprise/Ultimate SP 1 (64 Bit)
+ Windows Server 2008 Standard Edition R2 (64 Bit)
+ Windows Server 2008 Standard Edition R2 SP1 (64 Bit)
Simatic Step 7 Professional V5.5 includes the following software packages:
+ Step 7 Basic Software: Hardware configuration, programming Ladder, FBD, IL
+ S7-Graph: Graphical programming
+ S7-SCL: Programming in SCL language
+ S7-PLCSIM: Simulation Software Simulator
Link Download Software 
>>> Download STEP 7 Professional V5.5 SP3
>>> Download S7-PLCSIM S7-300/S7-400
Password Extract: plc247.com
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