Data Type: Redundancy Area Type
By assigning a redundancy area type to objects of the application, you can influence which data is determined for the synchronization. The redundancy area types can be assigned only to variables of POUs of type PROGRAM or of type Global Variable List, and are then valid for all variables of the object. The assignment is done programmatically in the IEC code. The respective redundancy area type (synchronization type) determines whether and when the redundancy data is aligned.
Objects which are activated in the Redundancy Configuration editor on the Registered Areas tab automatically get the AREA_INPUT redundancy area type. As a result, these objects are registered one time. Afterwards, its synchronization type can be changed programmatically by means of a function call.
For more information, see: Registered Areas
Redundancy Area Type | Description |
|---|---|
| Data with this type is synchronized one time when the second PLC is booted up. After the alignment of this data, the second PLC goes into standby mode and the first PLC switches from standalone mode to active mode. TipIn the Redundancy Configuration object, on the Registered Areas tab, you can assign this redundancy area type by activating variables or addresses. Data activated there is registered as |
| No synchronization Assigned by function call TipIn the Redundancy Configuration object, on the Registered Areas tab, you can assign this redundancy area type by deactivating variables or addresses. |
| No synchronization, but a CRC is performed. |
| Synchronizes before writing of the outputs (limited data size) Assigned by function call |
| Synchronizes at each task cycle start (limited data size) Configuration in the CFG file of the RTS Assigned by function call |