Receive Blocks

In receive direction, the jobs enter the device module via the interface. The device module selects the correct receive block using the telecontrol address. To this end, during installation the receive blocks pass their parameterised telecontrol addresses to the device module, see documentation of ABB Control Builder Plus, chapter “AC500 ETHERNET Configuration => Configuration IEC60870-5-104 (Telecontrol) => Configuration => Control and Substations”.

The device module stores the data received and the receive blocks make the data available at their output pins in connection with the next computation of the user task.

Interrogation Command

The AC500 will answer interrogation command only if some general requirements are met:

For the command C_IC_NA_1 (interrogation command) the common address is either the broadcast address 255 255 or the defined station address and the qualifier of interrogation is <20> station interrogation. The answer will encode the defined station address. See documentation of ABB Control Builder Plus, chapter “AC500 ETHERNET Configuration => Configuration IEC60870-5-104 (Telecontrol) => Configuration => Control and Substations”.