The methods of connecting Citect and an
Siemens S7-200 PLC include:
- The S7-200 series with a 214 processor (or better) can be
programmed to use the serial port of the PLC with the MODBUS
protocol. This method takes up quite a bit of PLC memory and hence
only the 214 processors (or better) are capable of handling this.
Presumably some scan time is used up also. The PLC source code can
be provided by Citect Support on request, or can be found on the
FTP site as S7MODBUS.ZIP. This method uses Citect's standard MODBUS
driver.
- Citect has a I/O device driver using a product called APPLICOM
by APPLICOM International that allows communications using the S7's
native PPI protocol. The purchase of the APPLICOM product (which
includes a communications card) is required, but no PLC code is
required. Go to this link to get details of the Applicom product
http://www.woodhead.com/aboutus/productlines/applicom/
- A driver developed by a Citect distributor is available. This
driver is not currently supported by Ci Technologies, although it
can be obtained from Citect Support on request. This driver does
not require any additional hardware or software to operate. It is
planned that this driver will be included in the Citect product at
some future point.
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