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Communication with FESTO PLC devices

For the communication of the PROMOTIC application with the FESTO devices of the FEC series (i.e. all programable devices, for example FC660, FC640) the following methods, for example, can be used (information from 2008):
 

Serial link RS232 communication using the CI protocol

In the PLC on a serial link (branded as COM, but can be also runned on EXT using specific software) there is a simple text protocol, so called COMMAND INTERPRETER (CI in the following text). It is a simple character communication of the query-answer type, without the check sum and PLC adressing (i.e. only for point-to-point connection). The protocol standard has been published by the manufacturer.

The default setting is 9600b/s, 8bit, no parity (it can be opened using non-default setting, but it is used rarely, especialy for the COM link, because it is unavailable for the programming software then).

For this communication in the PROMOTIC system can be used: PmChar - Driver for communication by user defined ASCII/BIN protocol.

Communication via Ethernet

If the TCP/IP drivers are installed, then a similar Telnet server is running in the PLC, able to send and receive CI commands.

For this communication in the PROMOTIC system can be used: PmChar - Driver for communication by user defined ASCII/BIN protocol.

Communication via OPC or DDE

The FESTO company suppiles the OPC and DDE server for serial link and Ethernet.

The DDE server is for free. It is using the CI commands for communication. Via RS232 it is able to communicate with 4 PLC max., via Ethernet the maximum count is 48 PLCs.

OPC server is a commercial software.

Communication by Modbus protocol

The FEC automatic machines can be configured to communicate via Modbus protocol. This is not a very commonly used option.

For this communication in the PROMOTIC system can be used: PmModbusMr - Driver for communication by Modbus Master protocol.

For easy integration of this driver into the application it is handy to use:
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