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Driver for the IEC 60870-5-103 protocol (serial or TCP/IP).

The communication between the control system and the PLC is based on IEC 60870-5-103. On protocol level, the control system ('the control system' - primary station according to IEC 60870-5-2) acts as the Master and the PLC ('the protection equipment') as the Slave.

The driver sends the ASDUs (Application Service Data Units) in a so-called control direction, the PLC in monitor direction.

In the serial case, zenon works as the master in unbalanced communication mode. The communication channel can be shared between a 60870 Master and several 60870 Slaves. For TCP/IP, the control system acts as the Master on protocol level and as a Client on TCP level.

The communication is spontaneous, Additionally, the driver cyclically sends out General Interrogations according to the GenInt setting in the driver configuration.