E_IEC870_5_101LinkMode

Configures the data transfer mode.

TYPE E_IEC870_5_101LinkMode :
(
    eIEC870_LinkMode_Unbalanced,
    eIEC870_LinkMode_Balanced
);
END_TYPE

eIEC870_LinkMode_Unbalanced: Unbalanced transmission (asymmetric data transfer). The controlling station controls the data transfer by polling the controlled outstations sequentially. The controlling station initiates the message transfers while the controlled outstations can transmit only in response to the message from the controlling station.

eIEC870_LinkMode_Balanced: Balanced transmission (symmetric data transfer). Available only in newer product versions:

• TwinCAT PLC Library IEC 60870-5-101 Master v2.0.1 and higher;
• TwinCAT PLC Library IEC 60870-5-101 Slave v4.0.1 and higher;

When using balanced transmission, each station can initiate message transfer. The balanced transmission is restricted to point-to-point and to multiple point-to-point
configurations.

Requirements