The IEC 60870-5-104 telecontrol protocol has already been used as a slave for some time in a wide range of applications. However, some applications require devices to act both as a slave connected to a control system, and at the same time as a master for subordinate devices. A new PLC library offering master functionality was therefore developed. The slave and master process images can easily be synchronised.

| Ordering information | |
|---|---|
| TwinCAT PLC IEC 60870-5-104 Master | licence for using an IEC 61131-3 software library for TwinCAT PLC |
| TwinCAT PLC IEC 60870-5-104 Master CE | licence for using an IEC 61131-3 software library for TwinCAT PLC for Windows CE platforms |