|Coupling of a SCADA system over IEC 60870-5-104 to a PLC network|
Coupling of a SCADA system over IEC 60870-5-104 to a PLC network
||This diagram shows a solution where one PLC is coupled to
one remote control stations via the IEC 60870-5-104 protocol. Additionally, local
HMI is connected through the OPC DA XML protocol.
Profibus, ipConvPBM functions as a master and communicate with multiple
PLCs acting as slaves.
In control direction, IEC 60870-5-104 switching commands or set points are
mapped to the Profibus DPV0 input section.
In monitoring direction, digital and analog outputs are mapped to
IEC 60870-5-104 information objects. On loss of communication with one PLC all
associated information objects are transmitted with quality "not topical".
On connection reestablishment information objects are updated automatically.
The connection status with every single PLC is monitored via a separated
How data is allocated is freely configurable. Time stamps can be added in
ipConvPBM. To achieve that the system clock can be synchronized via NTP
protocol or remote communication protocol.