At the Mainova Gas section there is a number of substations which are to
be controlled directly over the network. Twenty protocol converters, one at each
station, are used as network node computer to link up the substations with the
superior redundantly laid out control stations. Communication to the superior
control stations is implemented with the IEC 60870-5-104 protocol.
The substations can also be controlled locally by a connected station control
computer, should there be a network failure.
The protocol converter and station control computer use platform-independent
OPC Classic
DA XML for communicating. The sphinx open visualization system of in-integrierte
informationssysteme GmbH runs on the station control computer. Both the network
node computer and the station control computer use the LINUX operating system.
Data transfer between protocol converter and substations is based on SEAB 1F,
IEC 60870-5-101 and Modbus.
The SEAB 1F data of the AEG MODICON A120 substations are transmitted over AEG UEM
201 modems
