Throughout the Geo SCADA Expert documentation suite ‘Information Object’—the objects that can be monitored or controlled on an outstation—are referred to as ‘points’. IEC 60870-5 slave outstations use Filtered Value Maps to store ‘point’ data. The source of the Filtered Value Map data typically comes from another source, such as another IEC 60870-5 device. The data is mapped into Geo SCADA Expert in order to enable the Controlling Station(s) to extract the required data from that device, using the IEC 60870-5-101 or IEC 60870-5-104 protocol.
You need to specify the Filtered Value Maps that each slave outstation uses, and the location of those Filtered Value Maps within the Geo SCADA Expert database. Before you can do this, you need to have created the required Filtered Value Maps on your system and configured them appropriately.
To determine which type(s) of Filtered Value Map need to be created, you need to know:
- The type of point data that each slave outstation is to store
- The ASDU format(s) that both Geo SCADA Expert and the SCADA master(s) support and are to use
- The type of Filtered Value Map that applies to each of those ASDU formats and point types.
The IEC 60870-5 protocol defines a number of ASDU formats (Types 1 to 15) that can be used for transmitting input or counter data. Geo SCADA Expert supports the odd-numbered ASDU types within this range. (Geo SCADA Expert also supports ASDU Types 30 to 37, which it uses for transmitting the same type of data with a 56-bit time stamp. Whenever events are generated for a Value Map, the slave transmits the data using the appropriate ASDU Type 30 to 37, rather than Type 1 to 15.) Refer to the SCADA master’s interoperability Profile document for information on which ASDU formats the SCADA master supports. For information on which type of Filtered Value Map applies to each ASDU format, see Specify the Status Value Maps.
The IEC 60870-5 protocol also defines a number of ASDU formats (Types 45 to 51) that are associated with output data. Again, refer to the SCADA master’s interoperability Profile document for information on which ASDU formats the SCADA master supports. For information on which type of Filtered Value Map applies to each ASDU format, see Specify the Control Value Maps.
For information on configuring Filtered Value Maps, see Configuring Value Maps in the Geo SCADA Expert Guide to Core Configuration.
Once the Filtered Value Maps have been created and suitably configured on your system, you can associate those Value Maps with the relevant slave outstation. To do this, you use the fields on the Value Maps tab of the appropriate IEC 60870-5 Slave Outstation Form to define the Filtered Value Maps that a particular slave outstation uses.
The Value Maps tab contains fields that enable you to: