IEC 60870-5 Driver

Features

• Widely used, standardized remote control protocol.

• Process connection via TCP/IP Ethernet network or serial.

• Unlike VA TECH SAT & Co's SSI protocol (see SSI driver), in this case master control stations are not always used as data concentrators, rather all stations can be accessed as autonomous "bus users".

• The specifications allow vast scope and numerous variations: compatibility is only possible by means of an exact comparison of the supported functions (the IEC identifier is not enough!).

• In addition, the standard also allows 128 types of proprietary telegram - the WinCC OA driver implements the special telegrams for VA TECH SAT & Co's SSI protocols (by default, WinCC OA sends other proprietary telegrams as blobs).

• Other IEC 60870 versions are not supported (e.g. 103 for electrical protection equipment).

IEC 104, IEC 101

WinCC OA supports the two protocols IEC 60870-5-104 and IEC 60870-5-101.

IEC 101 distinguishes between two modes of transmission:

• balanced (symmetrical transmission): 1 primary station: 1 secondary station. Station A and B with equal rights.

• unbalanced (asymmetrical transmission): 1 primary station: n secondary stations, data acquisition by pure polling.

The IEC 101 supports only the Master mode. The Slave mode is not supported.

Addressing scheme for drivers and connections

The address format of the IEC driver is as follows:

• Type. Common Address. Information Object Address

The type only specifies the type of telegram (e.g. single-point information, measured value, etc.) and is therefore not required for the definition of connection addresses.

• Common Address describes the station, where data are coming from or where data are sent to.

• Information Object Address is the address specification within the telecontrol components.

The connections to telecontrol components are configured on a separate panel. The driver only sends telegrams to the stations contained in the lists on this panel. It is a kind of address "filter".

In WinCC OA, the addresses of redundant connections are combined in a "global list" that you can apply to other connections simply by clicking. A value of "*" means all values between 0 and 255 are allowed.

It is also possible to specify the connection name explicitly in the peripheral address panel. In that case the lists will be ignored.

On the IEC connections panel that would look like this:

All addresses of Gateway1 are listed on the panel, all local connections only accessible through Gateway1 on the left, and the two global connections accessible through Gateway1 or Gateway2 on the right. In Gateway2 you can click to apply the global list for Gateway1, i.e. you do not have to configure the addresses twice.