Information

The Function Blocks of the IEC60870 library allow link-ups to be made between AC500 CPUs with onboard ETHERNET and external systems. The link-up takes place via the internal ETHERNET interface of the CPU. The telecontrol protocol according to IEC60870-5 is used.

The CPU can work as both control station and substation. In control direction setpoints and commands are set. In monitoring direction the control station sends status values, real values and discrete values to the substation. Via general inquiry, the substation requests the control station to send all status values, real values and discrete values. Otherwise, these values are sent by the control station on a change-driven basis, cyclically or when triggered by an application. Status values, real values and discrete values may contain timestamps. These are filled in with the time of the process station when sent. The CPU can time-synchronise the telecontrol link.

A module accepts the configuration of the physical interface (link layer) and the general protocol parts (application layer), see PLC configuration in Control Builder Plus help.

Send and receive blocks are available for data exchange. These blocks exist for the IEC60870-5 data types

• setpoint value
• command value
• double command value
• status value
• double status value
• real value and discrete value.

The inputs/outputs of the send and receive blocks are combined with the signals to be communicated.

• Data Flow Control
• Data Integrity of the IEC60870-5 Protocol
• Data transmission Function Blocks
  • Send Blocks
  • Receive Blocks