The Heidenhain Plug-in provides different triggers.
The datachange trigger is configured for a CNC datapoint and triggers the transfer when the datapoint is changed.
Limit value trigger
The Limit value Trigger monitors a data point for compliance of limits. It can be checked for exceeding or falling short. A hysteresis can also be configured.
For data transfers, handshakes are often used. The bit trigger is here the simplest way. OPC Router checks whether a bit requests a transfer. Once transferred, the bit is optionally reset or another bit is set as response. The success of the transfer can be transmitted to another data point.
The message trigger is the further development of the bit trigger in form of exchange like in a telegram. Not only a bit, moreover a counter is checked for a value change. In response, the number that triggered the transfer is written back after transfer. Reliability and traceability of this exchange is significantly higher.