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Alternative CPUs for Siemens’ racks

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article image The new CPU fits inside the Siemens S7-300 racks on any of the S7-300 aluminium rails.

THE new VIPA 300V CPU, from Automation Warehouse , is designed to be used instead of the S7-300 CPUs from Siemens and is still programmed by STEP7.

The processors from VIPA can come with both Profibus DP (12Mb) and TCP/IP - 4 port 10/100 TCP/IP switching hub built into the CPU.

All processors for STEP7 from VIPA come with an MPI (Multi Point Interface) port that supports communications with S7-300 processors, operator panels and programming adapters from Siemens. Global data and S7 functions over MPI is also supported.

They can also come with Profibus master or slave ports, which operate at up to 12Mb/s. The Profibus port is configured in STEP7 as you would a Siemens S7-300 processor. All Profibus remote I/O, operator panels, variable speed drives and other devices are supported.

Extended memory is provided, with CPUs in the range having up to 512kB work memory and 1MB load memory. As such, projects normally done with a S7-400 are possible using the VIPA 300V processors.

Since the load memory is so generous MMCs (Micro Memory Card) or FLASH memory modules are not required. However a MMC port is provided to store the program, or if you wish, you can now store the entire project with comments and symbols onboard the CPUs MMC.

Physically the CPUs are the same size as a standard S7-315-2 processor from Siemens, but under the normal door lies an additional 4 port hub that supports OPC servers, Siemens S7 functions, Siemens PG functions (program with STEP7 over TCP/IP), send - receive functions for S5 and S7 and much more.

To complement the CPUs, VIPA manufactures a range of digital and analog modules that may also be used in the Siemens S7-300 racks.

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